Make getgroups error non-fatal. Minor doc update.

4 files changed, 381 insertions, 365 deletions

diff --git a/ChangeLog b/ChangeLog
index 375d1cfc..f72977c1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-02-28         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* main.c (init_groupset): Make `getgroups' failing a non-fatal
+	error.  After all, what's the big deal?  Should help on Plan 9.
+
 2012-02-27         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* dfa.c (parse_bracket_exp): Revert changes 2012-02-15 to stay
diff --git a/doc/gawk.info b/doc/gawk.info
index bfaca25b..a33027cd 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -3173,6 +3173,10 @@ sequences and that are not listed in the table stand for themselves:
      constants are valid and work the way you want them to, using any
      version of `awk'.(2)
 
+     Finally, when `{' and `}' appear in regexp constants in a way that
+     cannot be interpreted as an interval expression (such as
+     `/q{a}/'), then they stand for themselves.
+
    In regular expressions, the `*', `+', and `?' operators, as well as
 the braces `{' and `}', have the highest precedence, followed by
 concatenation, and finally by `|'.  As in arithmetic, parentheses can
@@ -26079,7 +26083,7 @@ Index
                                                               (line  26)
 * gawk, regular expressions, operators:  GNU Regexp Operators.
                                                               (line   6)
-* gawk, regular expressions, precedence: Regexp Operators.    (line 157)
+* gawk, regular expressions, precedence: Regexp Operators.    (line 161)
 * gawk, RT variable in <1>:              Auto-set.            (line 196)
 * gawk, RT variable in <2>:              Getline/Variable/File.
                                                               (line  10)
@@ -26761,7 +26765,7 @@ Index
 * POSIX awk, OFMT variable and:          OFMT.                (line  27)
 * POSIX awk, period (.), using:          Regexp Operators.    (line  50)
 * POSIX awk, printf format strings and:  Format Modifiers.    (line 159)
-* POSIX awk, regular expressions and:    Regexp Operators.    (line 157)
+* POSIX awk, regular expressions and:    Regexp Operators.    (line 161)
 * POSIX awk, timestamps and:             Time Functions.      (line   6)
 * POSIX awk, | I/O operator and:         Getline/Pipe.        (line  52)
 * POSIX mode:                            Options.             (line 199)
@@ -26771,7 +26775,7 @@ Index
 * POSIXLY_CORRECT environment variable:  Options.             (line 289)
 * precedence <1>:                        Precedence.          (line   6)
 * precedence:                            Increment Ops.       (line  61)
-* precedence, regexp operators:          Regexp Operators.    (line 152)
+* precedence, regexp operators:          Regexp Operators.    (line 156)
 * print debugger command:                Viewing And Changing Data.
                                                               (line  36)
 * print statement:                       Printing.            (line  16)
@@ -26937,7 +26941,7 @@ Index
 * regular expressions, operators, gawk:  GNU Regexp Operators.
                                                               (line   6)
 * regular expressions, operators, precedence of: Regexp Operators.
-                                                              (line 152)
+                                                              (line 156)
 * regular expressions, searching for:    Egrep Program.       (line   6)
 * relational operators, See comparison operators: Typing and Comparison.
                                                               (line   9)
@@ -27490,361 +27494,361 @@ Node: Regexp127250
 Node: Regexp Usage128639
 Node: Escape Sequences130665
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-Ref: Case-sensitivity-Footnote-2155209
-Node: Leftmost Longest155317
-Node: Computed Regexps156518
-Node: Reading Files159928
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-Node: Fields170580
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-Node: Nonconstant Fields173699
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-Node: Default Field Splitting184511
-Node: Regexp Field Splitting185628
-Node: Single Character Fields188970
-Node: Command Line Field Separator190029
-Node: Field Splitting Summary193470
-Ref: Field Splitting Summary-Footnote-1196662
-Node: Constant Size196763
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-Node: Multiple Line205113
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-Node: Getline211139
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-Node: Getline/File216597
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-Node: Getline/Coprocess223272
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+Node: Id Program676308
+Node: Split Program679924
+Ref: Split Program-Footnote-1683443
+Node: Tee Program683571
+Node: Uniq Program686374
+Node: Wc Program693803
+Ref: Wc Program-Footnote-1698069
+Ref: Wc Program-Footnote-2698269
+Node: Miscellaneous Programs698361
+Node: Dupword Program699549
+Node: Alarm Program701580
+Node: Translate Program706329
+Ref: Translate Program-Footnote-1710716
+Ref: Translate Program-Footnote-2710944
+Node: Labels Program711078
+Ref: Labels Program-Footnote-1714449
+Node: Word Sorting714533
+Node: History Sorting718417
+Node: Extract Program720256
+Ref: Extract Program-Footnote-1727739
+Node: Simple Sed727867
+Node: Igawk Program730929
+Ref: Igawk Program-Footnote-1746086
+Ref: Igawk Program-Footnote-2746287
+Node: Anagram Program746425
+Node: Signature Program749493
+Node: Debugger750593
+Node: Debugging751504
+Node: Debugging Concepts751917
+Node: Debugging Terms753773
+Node: Awk Debugging756396
+Node: Sample dgawk session757288
+Node: dgawk invocation757780
+Node: Finding The Bug758962
+Node: List of Debugger Commands765448
+Node: Breakpoint Control766759
+Node: Dgawk Execution Control770395
+Node: Viewing And Changing Data773746
+Node: Dgawk Stack777083
+Node: Dgawk Info778543
+Node: Miscellaneous Dgawk Commands782491
+Node: Readline Support787919
+Node: Dgawk Limitations788757
+Node: Language History790946
+Node: V7/SVR3.1792458
+Node: SVR4794779
+Node: POSIX796221
+Node: BTL797229
+Node: POSIX/GNU797963
+Node: Common Extensions803114
+Node: Ranges and Locales804221
+Ref: Ranges and Locales-Footnote-1808825
+Node: Contributors809046
+Node: Installation813308
+Node: Gawk Distribution814202
+Node: Getting814686
+Node: Extracting815512
+Node: Distribution contents817204
+Node: Unix Installation822426
+Node: Quick Installation823043
+Node: Additional Configuration Options825005
+Node: Configuration Philosophy826482
+Node: Non-Unix Installation828824
+Node: PC Installation829282
+Node: PC Binary Installation830581
+Node: PC Compiling832429
+Node: PC Testing835373
+Node: PC Using836549
+Node: Cygwin840734
+Node: MSYS841734
+Node: VMS Installation842248
+Node: VMS Compilation842851
+Ref: VMS Compilation-Footnote-1843858
+Node: VMS Installation Details843916
+Node: VMS Running845551
+Node: VMS Old Gawk847158
+Node: Bugs847632
+Node: Other Versions851484
+Node: Notes856765
+Node: Compatibility Mode857457
+Node: Additions858240
+Node: Accessing The Source859052
+Node: Adding Code860477
+Node: New Ports866444
+Node: Dynamic Extensions870557
+Node: Internals871933
+Node: Plugin License881036
+Node: Sample Library881670
+Node: Internal File Description882356
+Node: Internal File Ops886071
+Ref: Internal File Ops-Footnote-1890852
+Node: Using Internal File Ops890992
+Node: Future Extensions893369
+Node: Basic Concepts895873
+Node: Basic High Level896630
+Ref: Basic High Level-Footnote-1900665
+Node: Basic Data Typing900850
+Node: Floating Point Issues905375
+Node: String Conversion Precision906458
+Ref: String Conversion Precision-Footnote-1908158
+Node: Unexpected Results908267
+Node: POSIX Floating Point Problems910093
+Ref: POSIX Floating Point Problems-Footnote-1913798
+Node: Glossary913836
+Node: Copying938812
+Node: GNU Free Documentation License976369
+Node: Index1001506
 
 End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index ee401f9e..83bd3b5d 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -4486,6 +4486,10 @@ it is good practice to always escape them with a backslash.  Then the
 regexp constants are valid and work the way you want them to, using
 any version of @command{awk}.@footnote{Use two backslashes if you're
 using a string constant with a regexp operator or function.}
+
+Finally, when @samp{@{} and @samp{@}} appear in regexp constants
+in a way that cannot be interpreted as an interval expression
+(such as @code{/q@{a@}/}), then they stand for themselves.
 @end table
 
 @cindex precedence, regexp operators
diff --git a/main.c b/main.c
index 05964a2d..3680e3f4 100644
--- a/main.c
+++ b/main.c
@@ -1372,17 +1372,20 @@ init_groupset()
 	 */
 	ngroups = getgroups(0, NULL);
 #endif
-	if (ngroups == -1)
-		fatal(_("could not find groups: %s"), strerror(errno));
-	else if (ngroups == 0)
+	/* If an error or no groups, just give up and get on with life. */
+	if (ngroups <= 0)
 		return;
 
 	/* fill in groups */
 	emalloc(groupset, GETGROUPS_T *, ngroups * sizeof(GETGROUPS_T), "init_groupset");
 
 	ngroups = getgroups(ngroups, groupset);
-	if (ngroups == -1)
-		fatal(_("could not find groups: %s"), strerror(errno));
+	/* same thing here, give up but keep going */
+	if (ngroups == -1) {
+		efree(groupset);
+		ngroups = 0;
+		groupset = NULL;
+	}
 #endif
 }