Fork and wait support.

* sysif.c (work_wrap, wait_wrap, wifexited, wexitstatus,
wifsignaled, wtermsig, wcoredump, wifstopped, wstopsig,
wifcontinued): New static functions.
(sysif_init): Register new intrinsics: functions fork, wait,
w-ifexited, w-exitstatus, w-ifsignaled, w-termsig,
w-coredump, w-ifstopped, w-stopsig, w-ifcontinued; and
variables w-nohang, w-untraced, w-continued.

* txr.1: Documented.

* tl.vim, txr.vim: Regenerated.

5 files changed, 510 insertions, 258 deletions

diff --git a/ChangeLog b/ChangeLog
index d2fb07f2..72764526 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,19 @@
+2015-04-09  Kaz Kylheku  <kaz@kylheku.com>
+
+	Fork and wait support.
+
+	* sysif.c (work_wrap, wait_wrap, wifexited, wexitstatus,
+	wifsignaled, wtermsig, wcoredump, wifstopped, wstopsig,
+	wifcontinued): New static functions.
+	(sysif_init): Register new intrinsics: functions fork, wait,
+	w-ifexited, w-exitstatus, w-ifsignaled, w-termsig,
+	w-coredump, w-ifstopped, w-stopsig, w-ifcontinued; and
+	variables w-nohang, w-untraced, w-continued.
+
+	* txr.1: Documented.
+
+	* tl.vim, txr.vim: Regenerated.
+
 2015-04-06  Kaz Kylheku  <kaz@kylheku.com>
 
 	* eval.c (iflet_s, when_s): New global variables.
diff --git a/sysif.c b/sysif.c
index 04466896..545992b5 100644
--- a/sysif.c
+++ b/sysif.c
@@ -384,6 +384,78 @@ static val readlink_wrap(val path)
 
 #endif
 
+#if HAVE_SYS_WAIT
+static val fork_wrap(void)
+{
+  pid_t pid = fork();
+
+  if (pid < 0)
+    return nil;
+  return num(pid);
+}
+
+static val wait_wrap(val pid, val flags)
+{
+  cnum p = c_num(default_arg(pid, negone));
+  cnum f = c_num(default_arg(flags, zero));
+  int status = 0, result = waitpid(p, &status, f);
+  return if2(result >= 0, cons(num(result), num(status)));
+}
+
+static val wifexited(val status)
+{
+  int s = c_num(if3(consp(status), cdr(status), status));
+  return c_true(WIFEXITED(s));
+}
+
+static val wexitstatus(val status)
+{
+  int s = c_num(if3(consp(status), cdr(status), status));
+  return num(WEXITSTATUS(s));
+}
+
+static val wifsignaled(val status)
+{
+  int s = c_num(if3(consp(status), cdr(status), status));
+  return c_true(WIFSIGNALED(s));
+}
+
+static val wtermsig(val status)
+{
+  int s = c_num(if3(consp(status), cdr(status), status));
+  return num(WTERMSIG(s));
+}
+
+#ifdef WCOREDUMP
+static val wcoredump(val status)
+{
+  int s = c_num(if3(consp(status), cdr(status), status));
+  return c_true(WCOREDUMP(s));
+}
+#endif
+
+static val wifstopped(val status)
+{
+  int s = c_num(if3(consp(status), cdr(status), status));
+  return c_true(WIFSTOPPED(s));
+}
+
+static val wstopsig(val status)
+{
+  int s = c_num(if3(consp(status), cdr(status), status));
+  return num(WSTOPSIG(s));
+}
+
+#ifdef WIFCONTINUED
+static val wifcontinued(val status)
+{
+  int s = c_num(if3(consp(status), cdr(status), status));
+  return c_true(WIFCONTINUED(s));
+}
+#endif
+
+#endif
+
 #if HAVE_SYS_STAT
 static int w_stat(const wchar_t *wpath, struct stat *buf)
 {
@@ -554,4 +626,30 @@ void sysif_init(void)
   reg_var(intern(lit("s-iwoth"), user_package), num_fast(S_IWOTH));
   reg_var(intern(lit("s-ixoth"), user_package), num_fast(S_IXOTH));
 #endif
+
+#if HAVE_SYS_WAIT
+  reg_fun(intern(lit("fork"), user_package), func_n0(fork_wrap));
+  reg_fun(intern(lit("wait"), user_package), func_n2o(wait_wrap, 0));
+  reg_fun(intern(lit("w-ifexited"), user_package), func_n1(wifexited));
+  reg_fun(intern(lit("w-exitstatus"), user_package), func_n1(wexitstatus));
+  reg_fun(intern(lit("w-ifsignaled"), user_package), func_n1(wifsignaled));
+  reg_fun(intern(lit("w-termsig"), user_package), func_n1(wtermsig));
+#ifdef WCOREDUMP
+  reg_fun(intern(lit("w-coredump"), user_package), func_n1(wcoredump));
+#endif
+  reg_fun(intern(lit("w-ifstopped"), user_package), func_n1(wifstopped));
+  reg_fun(intern(lit("w-stopsig"), user_package), func_n1(wstopsig));
+#ifdef WIFCONTINUED
+  reg_fun(intern(lit("w-ifcontinued"), user_package), func_n1(wifcontinued));
+#endif
+#ifdef WNOHANG
+  reg_var(intern(lit("w-nohang"), user_package), num_fast(WNOHANG));
+#endif
+#ifdef WUNTRACED
+  reg_var(intern(lit("w-untraced"), user_package), num_fast(WUNTRACED));
+#endif
+#ifdef WCONTINUED
+  reg_var(intern(lit("w-continued"), user_package), num_fast(WCONTINUED));
+#endif
+#endif
 }
diff --git a/tl.vim b/tl.vim
index 40ba440f..b38ac770 100644
--- a/tl.vim
+++ b/tl.vim
@@ -66,135 +66,138 @@ syn keyword txl_keyword contained find-max find-min find-package first
 syn keyword txl_keyword contained fixnump flatten flatten* flet
 syn keyword txl_keyword contained flip flo-int flo-str floatp
 syn keyword txl_keyword contained floor flush-stream for for*
-syn keyword txl_keyword contained force format fourth fun
-syn keyword txl_keyword contained func-get-env func-get-form func-set-env functionp
-syn keyword txl_keyword contained gcd gen generate gensym
-syn keyword txl_keyword contained gequal get-byte get-char get-error
-syn keyword txl_keyword contained get-error-str get-hash-userdata get-line get-lines
-syn keyword txl_keyword contained get-list-from-stream get-sig-handler get-string get-string-from-stream
-syn keyword txl_keyword contained gethash getitimer getpid getppid
-syn keyword txl_keyword contained giterate glob glob-altdirfunc glob-brace
-syn keyword txl_keyword contained glob-err glob-mark glob-nocheck glob-noescape
-syn keyword txl_keyword contained glob-nomagic glob-nosort glob-onlydir glob-period
-syn keyword txl_keyword contained glob-tilde glob-tilde-check greater group-by
-syn keyword txl_keyword contained gun hash hash-alist hash-construct
-syn keyword txl_keyword contained hash-count hash-diff hash-eql hash-equal
-syn keyword txl_keyword contained hash-isec hash-keys hash-pairs hash-uni
-syn keyword txl_keyword contained hash-update hash-update-1 hash-values hashp
-syn keyword txl_keyword contained html-decode html-encode iapply identity
-syn keyword txl_keyword contained ido if iff iffi
-syn keyword txl_keyword contained iflet ignerr in inc
-syn keyword txl_keyword contained inhash int-flo int-str integerp
-syn keyword txl_keyword contained intern interp-fun-p interpose ip
-syn keyword txl_keyword contained ipf isqrt itimer-prov itimer-real
-syn keyword txl_keyword contained itimer-virtual juxt keep-if keep-if*
-syn keyword txl_keyword contained keywordp kill labels lambda
-syn keyword txl_keyword contained last lazy-str lazy-str-force lazy-str-force-upto
-syn keyword txl_keyword contained lazy-str-get-trailing-list lazy-stream-cons lazy-stringp lbind
-syn keyword txl_keyword contained lcm lcons-fun lconsp ldiff
-syn keyword txl_keyword contained length length-list length-str length-str-<
-syn keyword txl_keyword contained length-str-<= length-str-> length-str->= length-vec
-syn keyword txl_keyword contained lequal less let let*
-syn keyword txl_keyword contained lexical-fun-p lexical-lisp1-binding lexical-var-p link
-syn keyword txl_keyword contained lisp-parse list list* list-str
-syn keyword txl_keyword contained list-vector listp log log-alert
-syn keyword txl_keyword contained log-auth log-authpriv log-cons log-crit
-syn keyword txl_keyword contained log-daemon log-debug log-emerg log-err
-syn keyword txl_keyword contained log-info log-ndelay log-notice log-nowait
-syn keyword txl_keyword contained log-odelay log-perror log-pid log-user
-syn keyword txl_keyword contained log-warning log10 log2 logand
-syn keyword txl_keyword contained logior lognot logtest logtrunc
-syn keyword txl_keyword contained logxor macro-form-p macro-time macroexpand
-syn keyword txl_keyword contained macroexpand-1 macrolet major make-catenated-stream
-syn keyword txl_keyword contained make-env make-hash make-lazy-cons make-like
-syn keyword txl_keyword contained make-package make-random-state make-similar-hash make-string-byte-input-stream
-syn keyword txl_keyword contained make-string-input-stream make-string-output-stream make-strlist-output-stream make-sym
-syn keyword txl_keyword contained make-time make-time-utc make-trie makedev
-syn keyword txl_keyword contained mapcar mapcar* mapdo mapf
-syn keyword txl_keyword contained maphash mappend mappend* mask
-syn keyword txl_keyword contained match-fun match-regex match-regex-right match-regst
-syn keyword txl_keyword contained match-regst-right match-str match-str-tree max
-syn keyword txl_keyword contained member member-if memq memql
-syn keyword txl_keyword contained memqual merge min minor
-syn keyword txl_keyword contained minusp mkdir mknod mkstring
-syn keyword txl_keyword contained mod multi multi-sort n-choose-k
-syn keyword txl_keyword contained n-perm-k nconc nilf none
-syn keyword txl_keyword contained not notf nreverse null
-syn keyword txl_keyword contained nullify num-chr num-str numberp
-syn keyword txl_keyword contained oand oddp op open-command
-syn keyword txl_keyword contained open-directory open-file open-files open-files*
-syn keyword txl_keyword contained open-pipe open-process open-tail openlog
-syn keyword txl_keyword contained opip or orf packagep
-syn keyword txl_keyword contained pad partition partition* partition-by
-syn keyword txl_keyword contained perm plusp pop pos
-syn keyword txl_keyword contained pos-if pos-max pos-min posq
-syn keyword txl_keyword contained posql posqual pppred ppred
-syn keyword txl_keyword contained pprinl pprint pprof pred
-syn keyword txl_keyword contained prinl print prof prog1
-syn keyword txl_keyword contained progn prop proper-listp push
-syn keyword txl_keyword contained pushhash put-byte put-char put-line
-syn keyword txl_keyword contained put-lines put-string put-strings pwd
-syn keyword txl_keyword contained qquote quasi quasilist quote
-syn keyword txl_keyword contained rand random random-fixnum random-state-p
-syn keyword txl_keyword contained range range* range-regex rcomb
-syn keyword txl_keyword contained read readlink real-time-stream-p reduce-left
-syn keyword txl_keyword contained reduce-right ref refset regex-compile
-syn keyword txl_keyword contained regex-parse regexp regsub rehome-sym
-syn keyword txl_keyword contained remhash remove-if remove-if* remove-path
-syn keyword txl_keyword contained remq remq* remql remql*
-syn keyword txl_keyword contained remqual remqual* rename-path repeat
-syn keyword txl_keyword contained replace replace-list replace-str replace-vec
-syn keyword txl_keyword contained rest ret retf return
-syn keyword txl_keyword contained return-from reverse rlcp rperm
-syn keyword txl_keyword contained rplaca rplacd run s-ifblk
-syn keyword txl_keyword contained s-ifchr s-ifdir s-ififo s-iflnk
-syn keyword txl_keyword contained s-ifmt s-ifreg s-ifsock s-irgrp
-syn keyword txl_keyword contained s-iroth s-irusr s-irwxg s-irwxo
-syn keyword txl_keyword contained s-irwxu s-isgid s-isuid s-isvtx
-syn keyword txl_keyword contained s-iwgrp s-iwoth s-iwusr s-ixgrp
-syn keyword txl_keyword contained s-ixoth s-ixusr search search-regex
-syn keyword txl_keyword contained search-regst search-str search-str-tree second
-syn keyword txl_keyword contained seek-stream select seqp set
-syn keyword txl_keyword contained set-diff set-hash-userdata set-sig-handler sethash
-syn keyword txl_keyword contained setitimer setlogmask sh sig-abrt
-syn keyword txl_keyword contained sig-alrm sig-bus sig-check sig-chld
-syn keyword txl_keyword contained sig-cont sig-fpe sig-hup sig-ill
-syn keyword txl_keyword contained sig-int sig-io sig-iot sig-kill
-syn keyword txl_keyword contained sig-lost sig-pipe sig-poll sig-prof
-syn keyword txl_keyword contained sig-pwr sig-quit sig-segv sig-stkflt
-syn keyword txl_keyword contained sig-stop sig-sys sig-term sig-trap
-syn keyword txl_keyword contained sig-tstp sig-ttin sig-ttou sig-urg
-syn keyword txl_keyword contained sig-usr1 sig-usr2 sig-vtalrm sig-winch
-syn keyword txl_keyword contained sig-xcpu sig-xfsz sign-extend sin
-syn keyword txl_keyword contained sixth size-vec some sort
-syn keyword txl_keyword contained sort-group source-loc source-loc-str span-str
-syn keyword txl_keyword contained splice split-str split-str-set sqrt
-syn keyword txl_keyword contained sssucc ssucc stat stdlib
-syn keyword txl_keyword contained str< str<= str= str>
-syn keyword txl_keyword contained str>= stream-get-prop stream-set-prop streamp
-syn keyword txl_keyword contained string-extend string-lt stringp sub
-syn keyword txl_keyword contained sub-list sub-str sub-vec succ
-syn keyword txl_keyword contained symacrolet symbol-function symbol-name symbol-package
-syn keyword txl_keyword contained symbol-value symbolp symlink sys-qquote
-syn keyword txl_keyword contained sys-splice sys-unquote syslog tan
-syn keyword txl_keyword contained tb tc tf third
-syn keyword txl_keyword contained throw throwf time time-fields-local
-syn keyword txl_keyword contained time-fields-utc time-string-local time-string-utc time-usec
-syn keyword txl_keyword contained tofloat toint tok-str tok-where
-syn keyword txl_keyword contained tostring tostringp tprint transpose
-syn keyword txl_keyword contained tree-bind tree-case tree-find trie-add
-syn keyword txl_keyword contained trie-compress trie-lookup-begin trie-lookup-feed-char trie-value-at
-syn keyword txl_keyword contained trim-str true trunc trunc-rem
-syn keyword txl_keyword contained tuples txr-case txr-if txr-when
-syn keyword txl_keyword contained typeof unget-byte unget-char uniq
-syn keyword txl_keyword contained unique unless unquote until
-syn keyword txl_keyword contained upcase-str update url-decode url-encode
-syn keyword txl_keyword contained usleep uw-protect vec vec-push
-syn keyword txl_keyword contained vec-set-length vecref vector vector-list
-syn keyword txl_keyword contained vectorp weave when whenlet
-syn keyword txl_keyword contained where while whilet width
-syn keyword txl_keyword contained with-saved-vars wrap wrap* zap
-syn keyword txl_keyword contained zerop zip
+syn keyword txl_keyword contained force fork format fourth
+syn keyword txl_keyword contained fun func-get-env func-get-form func-set-env
+syn keyword txl_keyword contained functionp gcd gen generate
+syn keyword txl_keyword contained gensym gequal get-byte get-char
+syn keyword txl_keyword contained get-error get-error-str get-hash-userdata get-line
+syn keyword txl_keyword contained get-lines get-list-from-stream get-sig-handler get-string
+syn keyword txl_keyword contained get-string-from-stream gethash getitimer getpid
+syn keyword txl_keyword contained getppid giterate glob glob-altdirfunc
+syn keyword txl_keyword contained glob-brace glob-err glob-mark glob-nocheck
+syn keyword txl_keyword contained glob-noescape glob-nomagic glob-nosort glob-onlydir
+syn keyword txl_keyword contained glob-period glob-tilde glob-tilde-check greater
+syn keyword txl_keyword contained group-by gun hash hash-alist
+syn keyword txl_keyword contained hash-construct hash-count hash-diff hash-eql
+syn keyword txl_keyword contained hash-equal hash-isec hash-keys hash-pairs
+syn keyword txl_keyword contained hash-uni hash-update hash-update-1 hash-values
+syn keyword txl_keyword contained hashp html-decode html-encode iapply
+syn keyword txl_keyword contained identity ido if iff
+syn keyword txl_keyword contained iffi iflet ignerr in
+syn keyword txl_keyword contained inc inhash int-flo int-str
+syn keyword txl_keyword contained integerp intern interp-fun-p interpose
+syn keyword txl_keyword contained ip ipf isqrt itimer-prov
+syn keyword txl_keyword contained itimer-real itimer-virtual juxt keep-if
+syn keyword txl_keyword contained keep-if* keywordp kill labels
+syn keyword txl_keyword contained lambda last lazy-str lazy-str-force
+syn keyword txl_keyword contained lazy-str-force-upto lazy-str-get-trailing-list lazy-stream-cons lazy-stringp
+syn keyword txl_keyword contained lbind lcm lcons-fun lconsp
+syn keyword txl_keyword contained ldiff length length-list length-str
+syn keyword txl_keyword contained length-str-< length-str-<= length-str-> length-str->=
+syn keyword txl_keyword contained length-vec lequal less let
+syn keyword txl_keyword contained let* lexical-fun-p lexical-lisp1-binding lexical-var-p
+syn keyword txl_keyword contained link lisp-parse list list*
+syn keyword txl_keyword contained list-str list-vector listp log
+syn keyword txl_keyword contained log-alert log-auth log-authpriv log-cons
+syn keyword txl_keyword contained log-crit log-daemon log-debug log-emerg
+syn keyword txl_keyword contained log-err log-info log-ndelay log-notice
+syn keyword txl_keyword contained log-nowait log-odelay log-perror log-pid
+syn keyword txl_keyword contained log-user log-warning log10 log2
+syn keyword txl_keyword contained logand logior lognot logtest
+syn keyword txl_keyword contained logtrunc logxor macro-form-p macro-time
+syn keyword txl_keyword contained macroexpand macroexpand-1 macrolet major
+syn keyword txl_keyword contained make-catenated-stream make-env make-hash make-lazy-cons
+syn keyword txl_keyword contained make-like make-package make-random-state make-similar-hash
+syn keyword txl_keyword contained make-string-byte-input-stream make-string-input-stream make-string-output-stream make-strlist-output-stream
+syn keyword txl_keyword contained make-sym make-time make-time-utc make-trie
+syn keyword txl_keyword contained makedev mapcar mapcar* mapdo
+syn keyword txl_keyword contained mapf maphash mappend mappend*
+syn keyword txl_keyword contained mask match-fun match-regex match-regex-right
+syn keyword txl_keyword contained match-regst match-regst-right match-str match-str-tree
+syn keyword txl_keyword contained max member member-if memq
+syn keyword txl_keyword contained memql memqual merge min
+syn keyword txl_keyword contained minor minusp mkdir mknod
+syn keyword txl_keyword contained mkstring mod multi multi-sort
+syn keyword txl_keyword contained n-choose-k n-perm-k nconc nilf
+syn keyword txl_keyword contained none not notf nreverse
+syn keyword txl_keyword contained null nullify num-chr num-str
+syn keyword txl_keyword contained numberp oand oddp op
+syn keyword txl_keyword contained open-command open-directory open-file open-files
+syn keyword txl_keyword contained open-files* open-pipe open-process open-tail
+syn keyword txl_keyword contained openlog opip or orf
+syn keyword txl_keyword contained packagep pad partition partition*
+syn keyword txl_keyword contained partition-by perm plusp pop
+syn keyword txl_keyword contained pos pos-if pos-max pos-min
+syn keyword txl_keyword contained posq posql posqual pppred
+syn keyword txl_keyword contained ppred pprinl pprint pprof
+syn keyword txl_keyword contained pred prinl print prof
+syn keyword txl_keyword contained prog1 progn prop proper-listp
+syn keyword txl_keyword contained push pushhash put-byte put-char
+syn keyword txl_keyword contained put-line put-lines put-string put-strings
+syn keyword txl_keyword contained pwd qquote quasi quasilist
+syn keyword txl_keyword contained quote rand random random-fixnum
+syn keyword txl_keyword contained random-state-p range range* range-regex
+syn keyword txl_keyword contained rcomb read readlink real-time-stream-p
+syn keyword txl_keyword contained reduce-left reduce-right ref refset
+syn keyword txl_keyword contained regex-compile regex-parse regexp regsub
+syn keyword txl_keyword contained rehome-sym remhash remove-if remove-if*
+syn keyword txl_keyword contained remove-path remq remq* remql
+syn keyword txl_keyword contained remql* remqual remqual* rename-path
+syn keyword txl_keyword contained repeat replace replace-list replace-str
+syn keyword txl_keyword contained replace-vec rest ret retf
+syn keyword txl_keyword contained return return-from reverse rlcp
+syn keyword txl_keyword contained rperm rplaca rplacd run
+syn keyword txl_keyword contained s-ifblk s-ifchr s-ifdir s-ififo
+syn keyword txl_keyword contained s-iflnk s-ifmt s-ifreg s-ifsock
+syn keyword txl_keyword contained s-irgrp s-iroth s-irusr s-irwxg
+syn keyword txl_keyword contained s-irwxo s-irwxu s-isgid s-isuid
+syn keyword txl_keyword contained s-isvtx s-iwgrp s-iwoth s-iwusr
+syn keyword txl_keyword contained s-ixgrp s-ixoth s-ixusr search
+syn keyword txl_keyword contained search-regex search-regst search-str search-str-tree
+syn keyword txl_keyword contained second seek-stream select seqp
+syn keyword txl_keyword contained set set-diff set-hash-userdata set-sig-handler
+syn keyword txl_keyword contained sethash setitimer setlogmask sh
+syn keyword txl_keyword contained sig-abrt sig-alrm sig-bus sig-check
+syn keyword txl_keyword contained sig-chld sig-cont sig-fpe sig-hup
+syn keyword txl_keyword contained sig-ill sig-int sig-io sig-iot
+syn keyword txl_keyword contained sig-kill sig-lost sig-pipe sig-poll
+syn keyword txl_keyword contained sig-prof sig-pwr sig-quit sig-segv
+syn keyword txl_keyword contained sig-stkflt sig-stop sig-sys sig-term
+syn keyword txl_keyword contained sig-trap sig-tstp sig-ttin sig-ttou
+syn keyword txl_keyword contained sig-urg sig-usr1 sig-usr2 sig-vtalrm
+syn keyword txl_keyword contained sig-winch sig-xcpu sig-xfsz sign-extend
+syn keyword txl_keyword contained sin sixth size-vec some
+syn keyword txl_keyword contained sort sort-group source-loc source-loc-str
+syn keyword txl_keyword contained span-str splice split-str split-str-set
+syn keyword txl_keyword contained sqrt sssucc ssucc stat
+syn keyword txl_keyword contained stdlib str< str<= str=
+syn keyword txl_keyword contained str> str>= stream-get-prop stream-set-prop
+syn keyword txl_keyword contained streamp string-extend string-lt stringp
+syn keyword txl_keyword contained sub sub-list sub-str sub-vec
+syn keyword txl_keyword contained succ symacrolet symbol-function symbol-name
+syn keyword txl_keyword contained symbol-package symbol-value symbolp symlink
+syn keyword txl_keyword contained sys-qquote sys-splice sys-unquote syslog
+syn keyword txl_keyword contained tan tb tc tf
+syn keyword txl_keyword contained third throw throwf time
+syn keyword txl_keyword contained time-fields-local time-fields-utc time-string-local time-string-utc
+syn keyword txl_keyword contained time-usec tofloat toint tok-str
+syn keyword txl_keyword contained tok-where tostring tostringp tprint
+syn keyword txl_keyword contained transpose tree-bind tree-case tree-find
+syn keyword txl_keyword contained trie-add trie-compress trie-lookup-begin trie-lookup-feed-char
+syn keyword txl_keyword contained trie-value-at trim-str true trunc
+syn keyword txl_keyword contained trunc-rem tuples txr-case txr-if
+syn keyword txl_keyword contained txr-when typeof unget-byte unget-char
+syn keyword txl_keyword contained uniq unique unless unquote
+syn keyword txl_keyword contained until upcase-str update url-decode
+syn keyword txl_keyword contained url-encode usleep uw-protect vec
+syn keyword txl_keyword contained vec-push vec-set-length vecref vector
+syn keyword txl_keyword contained vector-list vectorp w-continued w-coredump
+syn keyword txl_keyword contained w-exitstatus w-ifcontinued w-ifexited w-ifsignaled
+syn keyword txl_keyword contained w-ifstopped w-nohang w-stopsig w-termsig
+syn keyword txl_keyword contained w-untraced wait weave when
+syn keyword txl_keyword contained whenlet where while whilet
+syn keyword txl_keyword contained width with-saved-vars wrap wrap*
+syn keyword txl_keyword contained zap zerop zip
 syn match txr_metanum "@[0-9]\+"
 syn match txr_nested_error "[^\t `]\+" contained
 
diff --git a/txr.1 b/txr.1
index 27727e2c..b24a278a 100644
--- a/txr.1
+++ b/txr.1
@@ -24684,6 +24684,138 @@ If the
 argument is omitted, it defaults to the same value as
 .codn sig-term .
 
+.SS* Unix Processes
+
+.coNP Functions @ fork and @ wait
+.synb
+.mets (fork)
+.mets (wait >> [ pid <> [ flags ]])
+.syne
+.desc
+The
+.code fork
+and
+.code wait
+functions are interfaces to the Unix functions
+.code fork
+and
+.codn waitpid .
+
+The
+.code fork
+function creates a child process which is a replica of the parent. Both
+processes return from the function. In the child process, the return value is
+zero. In the parent, it is an integer representing the process ID of the child.
+If the function fails to create a child, it returns
+.code nil
+rather than an integer. In this case, the
+.code errno
+function can be used to inquire about the cause.
+
+The
+.code wait
+function, if successful, returns a cons cell consisting of a pair of integers.
+The
+.code car
+of the cons is the process ID of the process or group which was successfully
+waited on, and the
+.code cdr
+is the status. If
+.code wait
+fails, it returns
+.codn nil .
+The
+.code errno
+function can be used to inquire about the cause.
+
+The
+.meta process-id
+argument, if not supplied, defaults to -1, which means that
+.code wait
+waits for any process, rather than a specific process. Certain other
+values have special meaning, as documented in the POSIX standard
+for the
+.code waitpid
+function.
+
+The
+.meta flags
+argument defaults to zero. If it is specified as nonzero, it should be
+a bitwise combination (via the
+.code logior
+function) of the constants
+.codn w-nohang ,
+.codn w-untraced
+and
+.codn w-continued .
+If
+.code w-nohang
+is used, then
+.code wait
+returns a cons cell whose
+.code car
+specifies a process ID value of zero in the situation that at least
+one of the processes designated by
+.code process-id
+exist and are children of the calling process, but have not changed state.
+In this case, the status value in the
+.code cdr
+is unspecified.
+
+Status values may be inspected with the functions
+.codn w-ifexited ,
+.codn w-exitstatus ,
+.codn w-ifsignaled ,
+.codn w-termsig ,
+.codn w-coredump ,
+.codn w-ifstopped ,
+.code w-stopsig
+and
+.codn w-ifcontinued .
+
+.coNP Functions @, w-ifexited @, w-exitstatus @, w-ifsignaled @, w-termsig @, w-coredump @ w-ifstopped and @ w-stopsig
+.synb
+.mets (w-ifexited << status )
+.mets (w-exitstatus << status )
+.mets (w-ifsignaled << status )
+.mets (w-termsig << status )
+.mets (w-coredump << status )
+.mets (w-ifstopped << status )
+.mets (w-stopsig << status )
+.mets (w-ifcontinued << status )
+.syne
+.desc
+These functions analyze process exit values produced by the
+.code wait
+function.
+
+They are closely based on the
+POSIX macros
+.codn WIFEXITED ,
+.code WEXITSTATUS ,
+and so on.
+
+The
+.meta status
+value is either an integer, or a cons cell. In this case, the cons
+cell is expected to have an integer in its
+.code cdr
+which is used as the status.
+
+The
+.codn w-ifexited ,
+.codn w-ifsignaled ,
+.codn w-coredump ,
+.code w-ifstopped
+and
+.code w-ifcontinued
+functions have Lisp boolean return semantics, unlike their C language
+counterparts: they return
+.code t
+or
+.codn nil ,
+rather than zero or nonzero. The others return integer values.
+
 .SS* Unix Itimers
 Itimers ("interval timers") can be used in combination with signal handling to
 execute asynchronous actions. Itimers deliver delayed, one-time signals,
diff --git a/txr.vim b/txr.vim
index 09229c68..890bea9e 100644
--- a/txr.vim
+++ b/txr.vim
@@ -66,135 +66,138 @@ syn keyword txl_keyword contained find-max find-min find-package first
 syn keyword txl_keyword contained fixnump flatten flatten* flet
 syn keyword txl_keyword contained flip flo-int flo-str floatp
 syn keyword txl_keyword contained floor flush-stream for for*
-syn keyword txl_keyword contained force format fourth fun
-syn keyword txl_keyword contained func-get-env func-get-form func-set-env functionp
-syn keyword txl_keyword contained gcd gen generate gensym
-syn keyword txl_keyword contained gequal get-byte get-char get-error
-syn keyword txl_keyword contained get-error-str get-hash-userdata get-line get-lines
-syn keyword txl_keyword contained get-list-from-stream get-sig-handler get-string get-string-from-stream
-syn keyword txl_keyword contained gethash getitimer getpid getppid
-syn keyword txl_keyword contained giterate glob glob-altdirfunc glob-brace
-syn keyword txl_keyword contained glob-err glob-mark glob-nocheck glob-noescape
-syn keyword txl_keyword contained glob-nomagic glob-nosort glob-onlydir glob-period
-syn keyword txl_keyword contained glob-tilde glob-tilde-check greater group-by
-syn keyword txl_keyword contained gun hash hash-alist hash-construct
-syn keyword txl_keyword contained hash-count hash-diff hash-eql hash-equal
-syn keyword txl_keyword contained hash-isec hash-keys hash-pairs hash-uni
-syn keyword txl_keyword contained hash-update hash-update-1 hash-values hashp
-syn keyword txl_keyword contained html-decode html-encode iapply identity
-syn keyword txl_keyword contained ido if iff iffi
-syn keyword txl_keyword contained iflet ignerr in inc
-syn keyword txl_keyword contained inhash int-flo int-str integerp
-syn keyword txl_keyword contained intern interp-fun-p interpose ip
-syn keyword txl_keyword contained ipf isqrt itimer-prov itimer-real
-syn keyword txl_keyword contained itimer-virtual juxt keep-if keep-if*
-syn keyword txl_keyword contained keywordp kill labels lambda
-syn keyword txl_keyword contained last lazy-str lazy-str-force lazy-str-force-upto
-syn keyword txl_keyword contained lazy-str-get-trailing-list lazy-stream-cons lazy-stringp lbind
-syn keyword txl_keyword contained lcm lcons-fun lconsp ldiff
-syn keyword txl_keyword contained length length-list length-str length-str-<
-syn keyword txl_keyword contained length-str-<= length-str-> length-str->= length-vec
-syn keyword txl_keyword contained lequal less let let*
-syn keyword txl_keyword contained lexical-fun-p lexical-lisp1-binding lexical-var-p link
-syn keyword txl_keyword contained lisp-parse list list* list-str
-syn keyword txl_keyword contained list-vector listp log log-alert
-syn keyword txl_keyword contained log-auth log-authpriv log-cons log-crit
-syn keyword txl_keyword contained log-daemon log-debug log-emerg log-err
-syn keyword txl_keyword contained log-info log-ndelay log-notice log-nowait
-syn keyword txl_keyword contained log-odelay log-perror log-pid log-user
-syn keyword txl_keyword contained log-warning log10 log2 logand
-syn keyword txl_keyword contained logior lognot logtest logtrunc
-syn keyword txl_keyword contained logxor macro-form-p macro-time macroexpand
-syn keyword txl_keyword contained macroexpand-1 macrolet major make-catenated-stream
-syn keyword txl_keyword contained make-env make-hash make-lazy-cons make-like
-syn keyword txl_keyword contained make-package make-random-state make-similar-hash make-string-byte-input-stream
-syn keyword txl_keyword contained make-string-input-stream make-string-output-stream make-strlist-output-stream make-sym
-syn keyword txl_keyword contained make-time make-time-utc make-trie makedev
-syn keyword txl_keyword contained mapcar mapcar* mapdo mapf
-syn keyword txl_keyword contained maphash mappend mappend* mask
-syn keyword txl_keyword contained match-fun match-regex match-regex-right match-regst
-syn keyword txl_keyword contained match-regst-right match-str match-str-tree max
-syn keyword txl_keyword contained member member-if memq memql
-syn keyword txl_keyword contained memqual merge min minor
-syn keyword txl_keyword contained minusp mkdir mknod mkstring
-syn keyword txl_keyword contained mod multi multi-sort n-choose-k
-syn keyword txl_keyword contained n-perm-k nconc nilf none
-syn keyword txl_keyword contained not notf nreverse null
-syn keyword txl_keyword contained nullify num-chr num-str numberp
-syn keyword txl_keyword contained oand oddp op open-command
-syn keyword txl_keyword contained open-directory open-file open-files open-files*
-syn keyword txl_keyword contained open-pipe open-process open-tail openlog
-syn keyword txl_keyword contained opip or orf packagep
-syn keyword txl_keyword contained pad partition partition* partition-by
-syn keyword txl_keyword contained perm plusp pop pos
-syn keyword txl_keyword contained pos-if pos-max pos-min posq
-syn keyword txl_keyword contained posql posqual pppred ppred
-syn keyword txl_keyword contained pprinl pprint pprof pred
-syn keyword txl_keyword contained prinl print prof prog1
-syn keyword txl_keyword contained progn prop proper-listp push
-syn keyword txl_keyword contained pushhash put-byte put-char put-line
-syn keyword txl_keyword contained put-lines put-string put-strings pwd
-syn keyword txl_keyword contained qquote quasi quasilist quote
-syn keyword txl_keyword contained rand random random-fixnum random-state-p
-syn keyword txl_keyword contained range range* range-regex rcomb
-syn keyword txl_keyword contained read readlink real-time-stream-p reduce-left
-syn keyword txl_keyword contained reduce-right ref refset regex-compile
-syn keyword txl_keyword contained regex-parse regexp regsub rehome-sym
-syn keyword txl_keyword contained remhash remove-if remove-if* remove-path
-syn keyword txl_keyword contained remq remq* remql remql*
-syn keyword txl_keyword contained remqual remqual* rename-path repeat
-syn keyword txl_keyword contained replace replace-list replace-str replace-vec
-syn keyword txl_keyword contained rest ret retf return
-syn keyword txl_keyword contained return-from reverse rlcp rperm
-syn keyword txl_keyword contained rplaca rplacd run s-ifblk
-syn keyword txl_keyword contained s-ifchr s-ifdir s-ififo s-iflnk
-syn keyword txl_keyword contained s-ifmt s-ifreg s-ifsock s-irgrp
-syn keyword txl_keyword contained s-iroth s-irusr s-irwxg s-irwxo
-syn keyword txl_keyword contained s-irwxu s-isgid s-isuid s-isvtx
-syn keyword txl_keyword contained s-iwgrp s-iwoth s-iwusr s-ixgrp
-syn keyword txl_keyword contained s-ixoth s-ixusr search search-regex
-syn keyword txl_keyword contained search-regst search-str search-str-tree second
-syn keyword txl_keyword contained seek-stream select seqp set
-syn keyword txl_keyword contained set-diff set-hash-userdata set-sig-handler sethash
-syn keyword txl_keyword contained setitimer setlogmask sh sig-abrt
-syn keyword txl_keyword contained sig-alrm sig-bus sig-check sig-chld
-syn keyword txl_keyword contained sig-cont sig-fpe sig-hup sig-ill
-syn keyword txl_keyword contained sig-int sig-io sig-iot sig-kill
-syn keyword txl_keyword contained sig-lost sig-pipe sig-poll sig-prof
-syn keyword txl_keyword contained sig-pwr sig-quit sig-segv sig-stkflt
-syn keyword txl_keyword contained sig-stop sig-sys sig-term sig-trap
-syn keyword txl_keyword contained sig-tstp sig-ttin sig-ttou sig-urg
-syn keyword txl_keyword contained sig-usr1 sig-usr2 sig-vtalrm sig-winch
-syn keyword txl_keyword contained sig-xcpu sig-xfsz sign-extend sin
-syn keyword txl_keyword contained sixth size-vec some sort
-syn keyword txl_keyword contained sort-group source-loc source-loc-str span-str
-syn keyword txl_keyword contained splice split-str split-str-set sqrt
-syn keyword txl_keyword contained sssucc ssucc stat stdlib
-syn keyword txl_keyword contained str< str<= str= str>
-syn keyword txl_keyword contained str>= stream-get-prop stream-set-prop streamp
-syn keyword txl_keyword contained string-extend string-lt stringp sub
-syn keyword txl_keyword contained sub-list sub-str sub-vec succ
-syn keyword txl_keyword contained symacrolet symbol-function symbol-name symbol-package
-syn keyword txl_keyword contained symbol-value symbolp symlink sys-qquote
-syn keyword txl_keyword contained sys-splice sys-unquote syslog tan
-syn keyword txl_keyword contained tb tc tf third
-syn keyword txl_keyword contained throw throwf time time-fields-local
-syn keyword txl_keyword contained time-fields-utc time-string-local time-string-utc time-usec
-syn keyword txl_keyword contained tofloat toint tok-str tok-where
-syn keyword txl_keyword contained tostring tostringp tprint transpose
-syn keyword txl_keyword contained tree-bind tree-case tree-find trie-add
-syn keyword txl_keyword contained trie-compress trie-lookup-begin trie-lookup-feed-char trie-value-at
-syn keyword txl_keyword contained trim-str true trunc trunc-rem
-syn keyword txl_keyword contained tuples txr-case txr-if txr-when
-syn keyword txl_keyword contained typeof unget-byte unget-char uniq
-syn keyword txl_keyword contained unique unless unquote until
-syn keyword txl_keyword contained upcase-str update url-decode url-encode
-syn keyword txl_keyword contained usleep uw-protect vec vec-push
-syn keyword txl_keyword contained vec-set-length vecref vector vector-list
-syn keyword txl_keyword contained vectorp weave when whenlet
-syn keyword txl_keyword contained where while whilet width
-syn keyword txl_keyword contained with-saved-vars wrap wrap* zap
-syn keyword txl_keyword contained zerop zip
+syn keyword txl_keyword contained force fork format fourth
+syn keyword txl_keyword contained fun func-get-env func-get-form func-set-env
+syn keyword txl_keyword contained functionp gcd gen generate
+syn keyword txl_keyword contained gensym gequal get-byte get-char
+syn keyword txl_keyword contained get-error get-error-str get-hash-userdata get-line
+syn keyword txl_keyword contained get-lines get-list-from-stream get-sig-handler get-string
+syn keyword txl_keyword contained get-string-from-stream gethash getitimer getpid
+syn keyword txl_keyword contained getppid giterate glob glob-altdirfunc
+syn keyword txl_keyword contained glob-brace glob-err glob-mark glob-nocheck
+syn keyword txl_keyword contained glob-noescape glob-nomagic glob-nosort glob-onlydir
+syn keyword txl_keyword contained glob-period glob-tilde glob-tilde-check greater
+syn keyword txl_keyword contained group-by gun hash hash-alist
+syn keyword txl_keyword contained hash-construct hash-count hash-diff hash-eql
+syn keyword txl_keyword contained hash-equal hash-isec hash-keys hash-pairs
+syn keyword txl_keyword contained hash-uni hash-update hash-update-1 hash-values
+syn keyword txl_keyword contained hashp html-decode html-encode iapply
+syn keyword txl_keyword contained identity ido if iff
+syn keyword txl_keyword contained iffi iflet ignerr in
+syn keyword txl_keyword contained inc inhash int-flo int-str
+syn keyword txl_keyword contained integerp intern interp-fun-p interpose
+syn keyword txl_keyword contained ip ipf isqrt itimer-prov
+syn keyword txl_keyword contained itimer-real itimer-virtual juxt keep-if
+syn keyword txl_keyword contained keep-if* keywordp kill labels
+syn keyword txl_keyword contained lambda last lazy-str lazy-str-force
+syn keyword txl_keyword contained lazy-str-force-upto lazy-str-get-trailing-list lazy-stream-cons lazy-stringp
+syn keyword txl_keyword contained lbind lcm lcons-fun lconsp
+syn keyword txl_keyword contained ldiff length length-list length-str
+syn keyword txl_keyword contained length-str-< length-str-<= length-str-> length-str->=
+syn keyword txl_keyword contained length-vec lequal less let
+syn keyword txl_keyword contained let* lexical-fun-p lexical-lisp1-binding lexical-var-p
+syn keyword txl_keyword contained link lisp-parse list list*
+syn keyword txl_keyword contained list-str list-vector listp log
+syn keyword txl_keyword contained log-alert log-auth log-authpriv log-cons
+syn keyword txl_keyword contained log-crit log-daemon log-debug log-emerg
+syn keyword txl_keyword contained log-err log-info log-ndelay log-notice
+syn keyword txl_keyword contained log-nowait log-odelay log-perror log-pid
+syn keyword txl_keyword contained log-user log-warning log10 log2
+syn keyword txl_keyword contained logand logior lognot logtest
+syn keyword txl_keyword contained logtrunc logxor macro-form-p macro-time
+syn keyword txl_keyword contained macroexpand macroexpand-1 macrolet major
+syn keyword txl_keyword contained make-catenated-stream make-env make-hash make-lazy-cons
+syn keyword txl_keyword contained make-like make-package make-random-state make-similar-hash
+syn keyword txl_keyword contained make-string-byte-input-stream make-string-input-stream make-string-output-stream make-strlist-output-stream
+syn keyword txl_keyword contained make-sym make-time make-time-utc make-trie
+syn keyword txl_keyword contained makedev mapcar mapcar* mapdo
+syn keyword txl_keyword contained mapf maphash mappend mappend*
+syn keyword txl_keyword contained mask match-fun match-regex match-regex-right
+syn keyword txl_keyword contained match-regst match-regst-right match-str match-str-tree
+syn keyword txl_keyword contained max member member-if memq
+syn keyword txl_keyword contained memql memqual merge min
+syn keyword txl_keyword contained minor minusp mkdir mknod
+syn keyword txl_keyword contained mkstring mod multi multi-sort
+syn keyword txl_keyword contained n-choose-k n-perm-k nconc nilf
+syn keyword txl_keyword contained none not notf nreverse
+syn keyword txl_keyword contained null nullify num-chr num-str
+syn keyword txl_keyword contained numberp oand oddp op
+syn keyword txl_keyword contained open-command open-directory open-file open-files
+syn keyword txl_keyword contained open-files* open-pipe open-process open-tail
+syn keyword txl_keyword contained openlog opip or orf
+syn keyword txl_keyword contained packagep pad partition partition*
+syn keyword txl_keyword contained partition-by perm plusp pop
+syn keyword txl_keyword contained pos pos-if pos-max pos-min
+syn keyword txl_keyword contained posq posql posqual pppred
+syn keyword txl_keyword contained ppred pprinl pprint pprof
+syn keyword txl_keyword contained pred prinl print prof
+syn keyword txl_keyword contained prog1 progn prop proper-listp
+syn keyword txl_keyword contained push pushhash put-byte put-char
+syn keyword txl_keyword contained put-line put-lines put-string put-strings
+syn keyword txl_keyword contained pwd qquote quasi quasilist
+syn keyword txl_keyword contained quote rand random random-fixnum
+syn keyword txl_keyword contained random-state-p range range* range-regex
+syn keyword txl_keyword contained rcomb read readlink real-time-stream-p
+syn keyword txl_keyword contained reduce-left reduce-right ref refset
+syn keyword txl_keyword contained regex-compile regex-parse regexp regsub
+syn keyword txl_keyword contained rehome-sym remhash remove-if remove-if*
+syn keyword txl_keyword contained remove-path remq remq* remql
+syn keyword txl_keyword contained remql* remqual remqual* rename-path
+syn keyword txl_keyword contained repeat replace replace-list replace-str
+syn keyword txl_keyword contained replace-vec rest ret retf
+syn keyword txl_keyword contained return return-from reverse rlcp
+syn keyword txl_keyword contained rperm rplaca rplacd run
+syn keyword txl_keyword contained s-ifblk s-ifchr s-ifdir s-ififo
+syn keyword txl_keyword contained s-iflnk s-ifmt s-ifreg s-ifsock
+syn keyword txl_keyword contained s-irgrp s-iroth s-irusr s-irwxg
+syn keyword txl_keyword contained s-irwxo s-irwxu s-isgid s-isuid
+syn keyword txl_keyword contained s-isvtx s-iwgrp s-iwoth s-iwusr
+syn keyword txl_keyword contained s-ixgrp s-ixoth s-ixusr search
+syn keyword txl_keyword contained search-regex search-regst search-str search-str-tree
+syn keyword txl_keyword contained second seek-stream select seqp
+syn keyword txl_keyword contained set set-diff set-hash-userdata set-sig-handler
+syn keyword txl_keyword contained sethash setitimer setlogmask sh
+syn keyword txl_keyword contained sig-abrt sig-alrm sig-bus sig-check
+syn keyword txl_keyword contained sig-chld sig-cont sig-fpe sig-hup
+syn keyword txl_keyword contained sig-ill sig-int sig-io sig-iot
+syn keyword txl_keyword contained sig-kill sig-lost sig-pipe sig-poll
+syn keyword txl_keyword contained sig-prof sig-pwr sig-quit sig-segv
+syn keyword txl_keyword contained sig-stkflt sig-stop sig-sys sig-term
+syn keyword txl_keyword contained sig-trap sig-tstp sig-ttin sig-ttou
+syn keyword txl_keyword contained sig-urg sig-usr1 sig-usr2 sig-vtalrm
+syn keyword txl_keyword contained sig-winch sig-xcpu sig-xfsz sign-extend
+syn keyword txl_keyword contained sin sixth size-vec some
+syn keyword txl_keyword contained sort sort-group source-loc source-loc-str
+syn keyword txl_keyword contained span-str splice split-str split-str-set
+syn keyword txl_keyword contained sqrt sssucc ssucc stat
+syn keyword txl_keyword contained stdlib str< str<= str=
+syn keyword txl_keyword contained str> str>= stream-get-prop stream-set-prop
+syn keyword txl_keyword contained streamp string-extend string-lt stringp
+syn keyword txl_keyword contained sub sub-list sub-str sub-vec
+syn keyword txl_keyword contained succ symacrolet symbol-function symbol-name
+syn keyword txl_keyword contained symbol-package symbol-value symbolp symlink
+syn keyword txl_keyword contained sys-qquote sys-splice sys-unquote syslog
+syn keyword txl_keyword contained tan tb tc tf
+syn keyword txl_keyword contained third throw throwf time
+syn keyword txl_keyword contained time-fields-local time-fields-utc time-string-local time-string-utc
+syn keyword txl_keyword contained time-usec tofloat toint tok-str
+syn keyword txl_keyword contained tok-where tostring tostringp tprint
+syn keyword txl_keyword contained transpose tree-bind tree-case tree-find
+syn keyword txl_keyword contained trie-add trie-compress trie-lookup-begin trie-lookup-feed-char
+syn keyword txl_keyword contained trie-value-at trim-str true trunc
+syn keyword txl_keyword contained trunc-rem tuples txr-case txr-if
+syn keyword txl_keyword contained txr-when typeof unget-byte unget-char
+syn keyword txl_keyword contained uniq unique unless unquote
+syn keyword txl_keyword contained until upcase-str update url-decode
+syn keyword txl_keyword contained url-encode usleep uw-protect vec
+syn keyword txl_keyword contained vec-push vec-set-length vecref vector
+syn keyword txl_keyword contained vector-list vectorp w-continued w-coredump
+syn keyword txl_keyword contained w-exitstatus w-ifcontinued w-ifexited w-ifsignaled
+syn keyword txl_keyword contained w-ifstopped w-nohang w-stopsig w-termsig
+syn keyword txl_keyword contained w-untraced wait weave when
+syn keyword txl_keyword contained whenlet where while whilet
+syn keyword txl_keyword contained width with-saved-vars wrap wrap*
+syn keyword txl_keyword contained zap zerop zip
 
 syn keyword txr_keyword contained accept all and assert
 syn keyword txr_keyword contained bind block cases cat