Improve handling of writes to dead pipes.

13 files changed, 605 insertions, 506 deletions

diff --git a/ChangeLog b/ChangeLog
index f7f40fd4..3798a5f9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,21 @@
+2013-10-22         Arnold D. Robbins     <arnold@skeeve.com>
+
+	Revise error messages when writing to standard output or standard
+	error to ignore EPIPE.  Add the ability based on an environment
+	variable to get the source file and line number.
+
+	* awk.h (r_warning): Renamed from warning.
+	(warning): New macro to set location and call warning.
+	* io.c (flush_io): Print errors only if not EPIPE.
+	(close_io): Ditto.
+	* main.c (lintfunc): Init to r_warning.
+	(main): Enhance explanatory comment.
+	(usage): Print errors only if not EPIPE.
+	(copyleft): Ditto.
+	* msg.c (err): Make printing srcfile and srcline depend upon
+	GAWK_MSG_SRC environment variable.
+	(r_warning): Renamed from warning.
+
 2013-10-17         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* main.c (main): Ignore SIGPIPE. See the comment in the code.
diff --git a/awk.h b/awk.h
index e2744e53..6c6e8405 100644
--- a/awk.h
+++ b/awk.h
@@ -213,6 +213,8 @@ typedef void *stackoverflow_context_t;
 /* use this as lintwarn("...")
    this is a hack but it gives us the right semantics */
 #define lintwarn (*(set_loc(__FILE__, __LINE__),lintfunc))
+/* same thing for warning */
+#define warning (*(set_loc(__FILE__, __LINE__),r_warning))
 
 #ifdef HAVE_MPFR
 #include <gmp.h>
@@ -1577,7 +1579,7 @@ extern void final_exit(int status) ATTRIBUTE_NORETURN;
 extern void err(bool isfatal, const char *s, const char *emsg, va_list argp) ATTRIBUTE_PRINTF(3, 0);
 extern void msg (const char *mesg, ...) ATTRIBUTE_PRINTF_1;
 extern void error (const char *mesg, ...) ATTRIBUTE_PRINTF_1;
-extern void warning (const char *mesg, ...) ATTRIBUTE_PRINTF_1;
+extern void r_warning (const char *mesg, ...) ATTRIBUTE_PRINTF_1;
 extern void set_loc (const char *file, int line);
 extern void r_fatal (const char *mesg, ...) ATTRIBUTE_PRINTF_1;
 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 2)
diff --git a/doc/ChangeLog b/doc/ChangeLog
index 2ee94503..5cef4595 100644
--- a/doc/ChangeLog
+++ b/doc/ChangeLog
@@ -1,3 +1,8 @@
+2013-10-22         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* gawktexi.in (Other Environment Variables): Document GAWK_MSG_SRC
+	variable and fix documentation of *_CHAIN_MAX variables.
+
 2013-10-11         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* gawktexi.in (Conversion, Printf Ordering): Better wording for
diff --git a/doc/gawk.info b/doc/gawk.info
index 5b3e4ac7..8fc3b2e9 100644
--- a/doc/gawk.info
+++ b/doc/gawk.info
@@ -2851,10 +2851,6 @@ used by regular users.
 the `gawk' developers for testing and tuning.  They are subject to
 change. The variables are:
 
-`AVG_CHAIN_MAX'
-     The average number of items `gawk' will maintain on a hash chain
-     for managing arrays.
-
 `AWK_HASH'
      If this variable exists with a value of `gst', `gawk' will switch
      to using the hash function from GNU Smalltalk for managing arrays.
@@ -2866,6 +2862,13 @@ change. The variables are:
      debugging problems on filesystems on non-POSIX operating systems
      where I/O is performed in records, not in blocks.
 
+`GAWK_MSG_SRC'
+     If this variable exists, `gawk' includes the source file name and
+     line number from which warning and/or fatal messages are
+     generated.  Its purpose is to help isolate the source of a
+     message, since there can be multiple places which produce the same
+     warning or error message.
+
 `GAWK_NO_DFA'
      If this variable exists, `gawk' does not use the DFA regexp matcher
      for "does it match" kinds of tests. This can cause `gawk' to be
@@ -2878,6 +2881,14 @@ change. The variables are:
      This specifies the amount by which `gawk' should grow its internal
      evaluation stack, when needed.
 
+`INT_CHAIN_MAX'
+     The average number of items `gawk' will maintain on a hash chain
+     for managing arrays indexed by integers.
+
+`STR_CHAIN_MAX'
+     The average number of items `gawk' will maintain on a hash chain
+     for managing arrays indexed by strings.
+
 `TIDYMEM'
      If this variable exists, `gawk' uses the `mtrace()' library calls
      from GNU LIBC to help track down possible memory leaks.
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+Ref: Conversion-Footnote-1314680
+Node: All Operators314789
+Node: Arithmetic Ops315419
+Node: Concatenation317924
+Ref: Concatenation-Footnote-1320717
+Node: Assignment Ops320837
+Ref: table-assign-ops325825
+Node: Increment Ops327156
+Node: Truth Values and Conditions330591
+Node: Truth Values331674
+Node: Typing and Comparison332723
+Node: Variable Typing333512
+Ref: Variable Typing-Footnote-1337409
+Node: Comparison Operators337531
+Ref: table-relational-ops337941
+Node: POSIX String Comparison341490
+Ref: POSIX String Comparison-Footnote-1342446
+Node: Boolean Ops342584
+Ref: Boolean Ops-Footnote-1346662
+Node: Conditional Exp346753
+Node: Function Calls348485
+Node: Precedence352079
+Node: Locales355748
+Node: Patterns and Actions356837
+Node: Pattern Overview357891
+Node: Regexp Patterns359560
+Node: Expression Patterns360103
+Node: Ranges363788
+Node: BEGIN/END366754
+Node: Using BEGIN/END367516
+Ref: Using BEGIN/END-Footnote-1370247
+Node: I/O And BEGIN/END370353
+Node: BEGINFILE/ENDFILE372635
+Node: Empty375549
+Node: Using Shell Variables375865
+Node: Action Overview378150
+Node: Statements380507
+Node: If Statement382361
+Node: While Statement383860
+Node: Do Statement385904
+Node: For Statement387060
+Node: Switch Statement390212
+Node: Break Statement392309
+Node: Continue Statement394299
+Node: Next Statement396092
+Node: Nextfile Statement398482
+Node: Exit Statement401125
+Node: Built-in Variables403541
+Node: User-modified404636
+Ref: User-modified-Footnote-1412996
+Node: Auto-set413058
+Ref: Auto-set-Footnote-1426136
+Ref: Auto-set-Footnote-2426341
+Node: ARGC and ARGV426397
+Node: Arrays430248
+Node: Array Basics431753
+Node: Array Intro432579
+Node: Reference to Elements436897
+Node: Assigning Elements439167
+Node: Array Example439658
+Node: Scanning an Array441390
+Node: Controlling Scanning443704
+Ref: Controlling Scanning-Footnote-1448627
+Node: Delete448943
+Ref: Delete-Footnote-1451708
+Node: Numeric Array Subscripts451765
+Node: Uninitialized Subscripts453948
+Node: Multi-dimensional455576
+Node: Multi-scanning458670
+Node: Arrays of Arrays460261
+Node: Functions464902
+Node: Built-in465721
+Node: Calling Built-in466799
+Node: Numeric Functions468787
+Ref: Numeric Functions-Footnote-1472619
+Ref: Numeric Functions-Footnote-2472976
+Ref: Numeric Functions-Footnote-3473024
+Node: String Functions473293
+Ref: String Functions-Footnote-1496851
+Ref: String Functions-Footnote-2496980
+Ref: String Functions-Footnote-3497228
+Node: Gory Details497315
+Ref: table-sub-escapes498994
+Ref: table-sub-posix-92500348
+Ref: table-sub-proposed501699
+Ref: table-posix-sub503053
+Ref: table-gensub-escapes504598
+Ref: Gory Details-Footnote-1505774
+Ref: Gory Details-Footnote-2505825
+Node: I/O Functions505976
+Ref: I/O Functions-Footnote-1512961
+Node: Time Functions513108
+Ref: Time Functions-Footnote-1524041
+Ref: Time Functions-Footnote-2524109
+Ref: Time Functions-Footnote-3524267
+Ref: Time Functions-Footnote-4524378
+Ref: Time Functions-Footnote-5524490
+Ref: Time Functions-Footnote-6524717
+Node: Bitwise Functions524983
+Ref: table-bitwise-ops525541
+Ref: Bitwise Functions-Footnote-1529762
+Node: Type Functions529946
+Node: I18N Functions531097
+Node: User-defined532724
+Node: Definition Syntax533528
+Ref: Definition Syntax-Footnote-1538438
+Node: Function Example538507
+Node: Function Caveats541101
+Node: Calling A Function541522
+Node: Variable Scope542637
+Node: Pass By Value/Reference545600
+Node: Return Statement549108
+Node: Dynamic Typing552089
+Node: Indirect Calls553020
+Node: Library Functions562705
+Ref: Library Functions-Footnote-1566218
+Ref: Library Functions-Footnote-2566361
+Node: Library Names566532
+Ref: Library Names-Footnote-1570003
+Ref: Library Names-Footnote-2570223
+Node: General Functions570309
+Node: Strtonum Function571337
+Node: Assert Function574267
+Node: Round Function577593
+Node: Cliff Random Function579136
+Node: Ordinal Functions580152
+Ref: Ordinal Functions-Footnote-1583222
+Ref: Ordinal Functions-Footnote-2583474
+Node: Join Function583683
+Ref: Join Function-Footnote-1585454
+Node: Getlocaltime Function585654
+Node: Readfile Function589395
+Node: Data File Management591234
+Node: Filetrans Function591866
+Node: Rewind Function595935
+Node: File Checking597322
+Node: Empty Files598416
+Node: Ignoring Assigns600646
+Node: Getopt Function602199
+Ref: Getopt Function-Footnote-1613503
+Node: Passwd Functions613706
+Ref: Passwd Functions-Footnote-1622681
+Node: Group Functions622769
+Node: Walking Arrays630853
+Node: Sample Programs632990
+Node: Running Examples633664
+Node: Clones634392
+Node: Cut Program635616
+Node: Egrep Program645461
+Ref: Egrep Program-Footnote-1653234
+Node: Id Program653344
+Node: Split Program656960
+Ref: Split Program-Footnote-1660479
+Node: Tee Program660607
+Node: Uniq Program663410
+Node: Wc Program670839
+Ref: Wc Program-Footnote-1675105
+Ref: Wc Program-Footnote-2675305
+Node: Miscellaneous Programs675397
+Node: Dupword Program676585
+Node: Alarm Program678616
+Node: Translate Program683365
+Ref: Translate Program-Footnote-1687752
+Ref: Translate Program-Footnote-2687980
+Node: Labels Program688114
+Ref: Labels Program-Footnote-1691485
+Node: Word Sorting691569
+Node: History Sorting695453
+Node: Extract Program697292
+Ref: Extract Program-Footnote-1704793
+Node: Simple Sed704921
+Node: Igawk Program707983
+Ref: Igawk Program-Footnote-1723140
+Ref: Igawk Program-Footnote-2723341
+Node: Anagram Program723479
+Node: Signature Program726547
+Node: Advanced Features727647
+Node: Nondecimal Data729529
+Node: Array Sorting731112
+Node: Controlling Array Traversal731809
+Node: Array Sorting Functions740047
+Ref: Array Sorting Functions-Footnote-1743721
+Ref: Array Sorting Functions-Footnote-2743814
+Node: Two-way I/O744008
+Ref: Two-way I/O-Footnote-1749440
+Node: TCP/IP Networking749510
+Node: Profiling752354
+Node: Internationalization759851
+Node: I18N and L10N761276
+Node: Explaining gettext761962
+Ref: Explaining gettext-Footnote-1767030
+Ref: Explaining gettext-Footnote-2767214
+Node: Programmer i18n767379
+Node: Translator i18n771581
+Node: String Extraction772374
+Ref: String Extraction-Footnote-1773335
+Node: Printf Ordering773421
+Ref: Printf Ordering-Footnote-1776205
+Node: I18N Portability776269
+Ref: I18N Portability-Footnote-1778718
+Node: I18N Example778781
+Ref: I18N Example-Footnote-1781419
+Node: Gawk I18N781491
+Node: Debugger782112
+Node: Debugging783083
+Node: Debugging Concepts783516
+Node: Debugging Terms785372
+Node: Awk Debugging787969
+Node: Sample Debugging Session788861
+Node: Debugger Invocation789381
+Node: Finding The Bug790713
+Node: List of Debugger Commands797201
+Node: Breakpoint Control798535
+Node: Debugger Execution Control802199
+Node: Viewing And Changing Data805559
+Node: Execution Stack808915
+Node: Debugger Info810382
+Node: Miscellaneous Debugger Commands814364
+Node: Readline Support819540
+Node: Limitations820371
+Node: Arbitrary Precision Arithmetic822623
+Ref: Arbitrary Precision Arithmetic-Footnote-1824274
+Node: General Arithmetic824422
+Node: Floating Point Issues826142
+Node: String Conversion Precision827023
+Ref: String Conversion Precision-Footnote-1828728
+Node: Unexpected Results828837
+Node: POSIX Floating Point Problems830990
+Ref: POSIX Floating Point Problems-Footnote-1834815
+Node: Integer Programming834853
+Node: Floating-point Programming836592
+Ref: Floating-point Programming-Footnote-1842923
+Ref: Floating-point Programming-Footnote-2843193
+Node: Floating-point Representation843457
+Node: Floating-point Context844622
+Ref: table-ieee-formats845461
+Node: Rounding Mode846845
+Ref: table-rounding-modes847324
+Ref: Rounding Mode-Footnote-1850339
+Node: Gawk and MPFR850518
+Node: Arbitrary Precision Floats851773
+Ref: Arbitrary Precision Floats-Footnote-1854216
+Node: Setting Precision854532
+Ref: table-predefined-precision-strings855218
+Node: Setting Rounding Mode857363
+Ref: table-gawk-rounding-modes857767
+Node: Floating-point Constants858954
+Node: Changing Precision860383
+Ref: Changing Precision-Footnote-1861783
+Node: Exact Arithmetic861957
+Node: Arbitrary Precision Integers865095
+Ref: Arbitrary Precision Integers-Footnote-1868113
+Node: Dynamic Extensions868260
+Node: Extension Intro869718
+Node: Plugin License870983
+Node: Extension Mechanism Outline871668
+Ref: load-extension872085
+Ref: load-new-function873563
+Ref: call-new-function874558
+Node: Extension API Description876573
+Node: Extension API Functions Introduction877786
+Node: General Data Types882652
+Ref: General Data Types-Footnote-1888254
+Node: Requesting Values888553
+Ref: table-value-types-returned889284
+Node: Constructor Functions890238
+Node: Registration Functions893258
+Node: Extension Functions893943
+Node: Exit Callback Functions896168
+Node: Extension Version String897417
+Node: Input Parsers898067
+Node: Output Wrappers907824
+Node: Two-way processors912334
+Node: Printing Messages914542
+Ref: Printing Messages-Footnote-1915619
+Node: Updating `ERRNO'915771
+Node: Accessing Parameters916510
+Node: Symbol Table Access917740
+Node: Symbol table by name918252
+Node: Symbol table by cookie919999
+Ref: Symbol table by cookie-Footnote-1924129
+Node: Cached values924192
+Ref: Cached values-Footnote-1927641
+Node: Array Manipulation927732
+Ref: Array Manipulation-Footnote-1928830
+Node: Array Data Types928869
+Ref: Array Data Types-Footnote-1931572
+Node: Array Functions931664
+Node: Flattening Arrays935430
+Node: Creating Arrays942282
+Node: Extension API Variables947007
+Node: Extension Versioning947643
+Node: Extension API Informational Variables949544
+Node: Extension API Boilerplate950630
+Node: Finding Extensions954434
+Node: Extension Example954994
+Node: Internal File Description955725
+Node: Internal File Ops959816
+Ref: Internal File Ops-Footnote-1971324
+Node: Using Internal File Ops971464
+Ref: Using Internal File Ops-Footnote-1973817
+Node: Extension Samples974083
+Node: Extension Sample File Functions975607
+Node: Extension Sample Fnmatch984094
+Node: Extension Sample Fork985820
+Node: Extension Sample Inplace987038
+Node: Extension Sample Ord988816
+Node: Extension Sample Readdir989652
+Node: Extension Sample Revout991184
+Node: Extension Sample Rev2way991777
+Node: Extension Sample Read write array992467
+Node: Extension Sample Readfile994350
+Node: Extension Sample API Tests995168
+Node: Extension Sample Time995693
+Node: gawkextlib997057
+Node: Language History999817
+Node: V7/SVR3.11001339
+Node: SVR41003660
+Node: POSIX1005102
+Node: BTL1006488
+Node: POSIX/GNU1007222
+Node: Common Extensions1012757
+Node: Ranges and Locales1014063
+Ref: Ranges and Locales-Footnote-11018681
+Ref: Ranges and Locales-Footnote-21018708
+Ref: Ranges and Locales-Footnote-31018968
+Node: Contributors1019189
+Node: Installation1024068
+Node: Gawk Distribution1024962
+Node: Getting1025446
+Node: Extracting1026272
+Node: Distribution contents1027964
+Node: Unix Installation1033225
+Node: Quick Installation1033842
+Node: Additional Configuration Options1036286
+Node: Configuration Philosophy1037763
+Node: Non-Unix Installation1040117
+Node: PC Installation1040575
+Node: PC Binary Installation1041874
+Node: PC Compiling1043722
+Node: PC Testing1046666
+Node: PC Using1047842
+Node: Cygwin1052027
+Node: MSYS1053027
+Node: VMS Installation1053541
+Node: VMS Compilation1054144
+Ref: VMS Compilation-Footnote-11055151
+Node: VMS Installation Details1055209
+Node: VMS Running1056844
+Node: VMS Old Gawk1058451
+Node: Bugs1058925
+Node: Other Versions1062777
+Node: Notes1068858
+Node: Compatibility Mode1069658
+Node: Additions1070441
+Node: Accessing The Source1071368
+Node: Adding Code1072808
+Node: New Ports1078853
+Node: Derived Files1082988
+Ref: Derived Files-Footnote-11088309
+Ref: Derived Files-Footnote-21088343
+Ref: Derived Files-Footnote-31088943
+Node: Future Extensions1089041
+Node: Implementation Limitations1089622
+Node: Extension Design1090874
+Node: Old Extension Problems1092028
+Ref: Old Extension Problems-Footnote-11093536
+Node: Extension New Mechanism Goals1093593
+Ref: Extension New Mechanism Goals-Footnote-11096959
+Node: Extension Other Design Decisions1097145
+Node: Extension Future Growth1099251
+Node: Old Extension Mechanism1100087
+Node: Basic Concepts1101827
+Node: Basic High Level1102508
+Ref: figure-general-flow1102779
+Ref: figure-process-flow1103378
+Ref: Basic High Level-Footnote-11106607
+Node: Basic Data Typing1106792
+Node: Glossary1110147
+Node: Copying1135609
+Node: GNU Free Documentation License1173166
+Node: Index1198303
 
 End Tag Table
diff --git a/doc/gawk.texi b/doc/gawk.texi
index 13a823b9..cd7d88a9 100644
--- a/doc/gawk.texi
+++ b/doc/gawk.texi
@@ -3956,10 +3956,6 @@ for use by the @command{gawk} developers for testing and tuning.
 They are subject to change. The variables are:
 
 @table @env
-@item AVG_CHAIN_MAX
-The average number of items @command{gawk} will maintain on a
-hash chain for managing arrays.
-
 @item AWK_HASH
 If this variable exists with a value of @samp{gst}, @command{gawk}
 will switch to using the hash function from GNU Smalltalk for
@@ -3972,6 +3968,13 @@ files one line at a time, instead of reading in blocks. This exists
 for debugging problems on filesystems on non-POSIX operating systems
 where I/O is performed in records, not in blocks.
 
+@item GAWK_MSG_SRC
+If this variable exists, @command{gawk} includes the source file
+name and line number from which warning and/or fatal messages
+are generated.  Its purpose is to help isolate the source of a
+message, since there can be multiple places which produce the
+same warning or error message.
+
 @item GAWK_NO_DFA
 If this variable exists, @command{gawk} does not use the DFA regexp matcher
 for ``does it match'' kinds of tests. This can cause @command{gawk}
@@ -3984,6 +3987,14 @@ coordinate with each other.)
 This specifies the amount by which @command{gawk} should grow its
 internal evaluation stack, when needed.
 
+@item INT_CHAIN_MAX
+The average number of items @command{gawk} will maintain on a
+hash chain for managing arrays indexed by integers.
+
+@item STR_CHAIN_MAX
+The average number of items @command{gawk} will maintain on a
+hash chain for managing arrays indexed by strings.
+
 @item TIDYMEM
 If this variable exists, @command{gawk} uses the @code{mtrace()} library
 calls from GNU LIBC to help track down possible memory leaks.
diff --git a/doc/gawktexi.in b/doc/gawktexi.in
index e1b86c75..f5e0fc06 100644
--- a/doc/gawktexi.in
+++ b/doc/gawktexi.in
@@ -3884,10 +3884,6 @@ for use by the @command{gawk} developers for testing and tuning.
 They are subject to change. The variables are:
 
 @table @env
-@item AVG_CHAIN_MAX
-The average number of items @command{gawk} will maintain on a
-hash chain for managing arrays.
-
 @item AWK_HASH
 If this variable exists with a value of @samp{gst}, @command{gawk}
 will switch to using the hash function from GNU Smalltalk for
@@ -3900,6 +3896,13 @@ files one line at a time, instead of reading in blocks. This exists
 for debugging problems on filesystems on non-POSIX operating systems
 where I/O is performed in records, not in blocks.
 
+@item GAWK_MSG_SRC
+If this variable exists, @command{gawk} includes the source file
+name and line number from which warning and/or fatal messages
+are generated.  Its purpose is to help isolate the source of a
+message, since there can be multiple places which produce the
+same warning or error message.
+
 @item GAWK_NO_DFA
 If this variable exists, @command{gawk} does not use the DFA regexp matcher
 for ``does it match'' kinds of tests. This can cause @command{gawk}
@@ -3912,6 +3915,14 @@ coordinate with each other.)
 This specifies the amount by which @command{gawk} should grow its
 internal evaluation stack, when needed.
 
+@item INT_CHAIN_MAX
+The average number of items @command{gawk} will maintain on a
+hash chain for managing arrays indexed by integers.
+
+@item STR_CHAIN_MAX
+The average number of items @command{gawk} will maintain on a
+hash chain for managing arrays indexed by strings.
+
 @item TIDYMEM
 If this variable exists, @command{gawk} uses the @code{mtrace()} library
 calls from GNU LIBC to help track down possible memory leaks.
diff --git a/io.c b/io.c
index e0632d8b..3daadb32 100644
--- a/io.c
+++ b/io.c
@@ -1261,12 +1261,15 @@ flush_io()
 	int status = 0;
 
 	errno = 0;
+	/* we don't warn about stdout/stderr if EPIPE, but we do error exit */
 	if (fflush(stdout)) {
-		warning(_("error writing standard output (%s)"), strerror(errno));
+		if (errno != EPIPE)
+			warning(_("error writing standard output (%s)"), strerror(errno));
 		status++;
 	}
 	if (fflush(stderr)) {
-		warning(_("error writing standard error (%s)"), strerror(errno));
+		if (errno != EPIPE)
+			warning(_("error writing standard error (%s)"), strerror(errno));
 		status++;
 	}
 	for (rp = red_head; rp != NULL; rp = rp->next)
@@ -1316,13 +1319,16 @@ close_io(bool *stdio_problem)
 	 * them, we just flush them, and do that across the board.
 	 */
 	*stdio_problem = false;
-	if (fflush(stdout)) {
-		warning(_("error writing standard output (%s)"), strerror(errno));
+	/* we don't warn about stdout/stderr if EPIPE, but we do error exit */
+	if (fflush(stdout) != 0) {
+		if (errno != EPIPE)
+			warning(_("error writing standard output (%s)"), strerror(errno));
 		status++;
 		*stdio_problem = true;
 	}
-	if (fflush(stderr)) {
-		warning(_("error writing standard error (%s)"), strerror(errno));
+	if (fflush(stderr) != 0) {
+		if (errno != EPIPE)
+			warning(_("error writing standard error (%s)"), strerror(errno));
 		status++;
 		*stdio_problem = true;
 	}
diff --git a/main.c b/main.c
index d765a43b..6d99c247 100644
--- a/main.c
+++ b/main.c
@@ -157,7 +157,7 @@ GETGROUPS_T *groupset;		/* current group set */
 int ngroups;			/* size of said set */
 #endif
 
-void (*lintfunc)(const char *mesg, ...) = warning;
+void (*lintfunc)(const char *mesg, ...) = r_warning;
 
 static const struct option optab[] = {
 	{ "traditional",	no_argument,		NULL,	'c' },
@@ -289,6 +289,14 @@ main(int argc, char **argv)
 	 * Ignore SIGPIPE so that writes to pipes that fail don't
 	 * kill the process but instead return -1 and set errno.
 	 * That lets us print a fatal message instead of dieing suddenly.
+	 *
+	 * Note that this requires ignoring EPIPE when writing and
+	 * flushing stdout/stderr in other parts of the program. E.g.,
+	 *
+	 * 	gawk 'BEGIN { print "hi" }' | exit
+	 *
+	 * should not give us "broken pipe" messages --- mainly because
+	 * it did not do so in the past and people would complain.
 	 */
 	signal(SIGPIPE, SIG_IGN);
 #endif
@@ -849,8 +857,13 @@ By default it reads standard input and writes standard output.\n\n"), fp);
 	fflush(fp);
 
 	if (ferror(fp)) {
-		if (fp == stdout)
-			warning(_("error writing standard output (%s)"), strerror(errno));
+		/* don't warn about stdout/stderr if EPIPE, but do error exit */
+		if (errno != EPIPE) {
+			if (fp == stdout)
+				warning(_("error writing standard output (%s)"), strerror(errno));
+			else if (fp == stderr)
+				warning(_("error writing standard error (%s)"), strerror(errno));
+		}
 		exit(EXIT_FAILURE);
 	}
 
@@ -887,7 +900,9 @@ along with this program. If not, see http://www.gnu.org/licenses/.\n");
 	fflush(stdout);
 
 	if (ferror(stdout)) {
-		warning(_("error writing standard output (%s)"), strerror(errno));
+		/* don't warn about stdout if EPIPE, but do error exit */
+		if (errno != EPIPE)
+			warning(_("error writing standard output (%s)"), strerror(errno));
 		exit(EXIT_FAILURE);
 	}
 
diff --git a/msg.c b/msg.c
index edacdd1c..16fef73a 100644
--- a/msg.c
+++ b/msg.c
@@ -44,15 +44,22 @@ err(bool isfatal, const char *s, const char *emsg, va_list argp)
 	char *file;
 	const char *me;
 
+	static bool first = true;
+	static bool add_src_info = false;
+
+	if (first) {
+		first = false;
+		add_src_info = (getenv("GAWK_MSG_SRC") != NULL);
+	}
+
 	(void) fflush(output_fp);
 	me = myname;
 	(void) fprintf(stderr, "%s: ", me);
-#ifdef GAWKDEBUG
-	if (srcfile != NULL) {
+
+	if (srcfile != NULL && add_src_info) {
 		fprintf(stderr, "%s:%d:", srcfile, srcline);
 		srcfile = NULL;
 	}
-#endif /* GAWKDEBUG */
 
 	if (sourceline > 0) {
 		if (source != NULL)
@@ -109,10 +116,10 @@ msg(const char *mesg, ...)
 	va_end(args);
 }
 
-/* warning --- print a warning message */
+/* r_warning --- print a warning message */
 
 void
-warning(const char *mesg, ...)
+r_warning(const char *mesg, ...)
 {
 	va_list args;
 	va_start(args, mesg);
diff --git a/test/ChangeLog b/test/ChangeLog
index 4de3d14b..beabad0d 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,14 @@
+2013-10-22         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* Makefile.am (pipeio3): Enhance test to be more resilient to variations
+	in error messages produced by different Bourne shells when a command
+	is not found.
+
+2013-10-17         Arnold D. Robbins     <arnold@skeeve.com>
+
+	* Makefile.am (pipeio3): New test.
+	* pipeio3.awk, pipeio3.ok: New files.
+
 2013-10-10         Arnold D. Robbins     <arnold@skeeve.com>
 
 	* Makefile.am (backbigs1, backsmalls1): New tests.
diff --git a/test/Makefile.am b/test/Makefile.am
index abb3fb96..ff3db193 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -1882,6 +1882,12 @@ backsmalls1:
 	AWKPATH="$(srcdir)" $(AWK) -f $@.awk "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
+pipeio3:
+	@echo $@
+	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@sed 's/sh.*cart:.*not found/sh: 1: cart: not found/' < _$@ >_x$@ ; mv _x$@ _$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
 # Targets generated for other tests:
 include Maketests
 
diff --git a/test/Makefile.in b/test/Makefile.in
index 9676494d..2ab56a5e 100644
--- a/test/Makefile.in
+++ b/test/Makefile.in
@@ -2275,6 +2275,12 @@ backsmalls1:
 	@[ -z "$$GAWKLOCALE" ] && GAWKLOCALE=en_US.UTF-8; \
 	AWKPATH="$(srcdir)" $(AWK) -f $@.awk "$(srcdir)"/$@.in >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
+
+pipeio3:
+	@echo $@
+	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
+	@sed 's/sh.*cart:.*not found/sh: 1: cart: not found/' < _$@ >_x$@ ; mv _x$@ _$@
+	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 Gt-dummy:
 # file Maketests, generated from Makefile.am by the Gentests program
 addcomma:
@@ -3184,11 +3190,6 @@ getlnhd:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
-pipeio3:
-	@echo $@
-	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
-	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
-
 aadelete1:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
diff --git a/test/Maketests b/test/Maketests
index 29f9a17c..df272ce8 100644
--- a/test/Maketests
+++ b/test/Maketests
@@ -907,11 +907,6 @@ getlnhd:
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
 	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
 
-pipeio3:
-	@echo $@
-	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@
-	@-$(CMP) "$(srcdir)"/$@.ok _$@ && rm -f _$@
-
 aadelete1:
 	@echo $@
 	@AWKPATH="$(srcdir)" $(AWK) -f $@.awk  >_$@ 2>&1 || echo EXIT CODE: $$? >>_$@