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[Emacs-diffs] trunk r113339: Handle errno and exit status a bit more car
|
From: |
Paul Eggert |
|
Subject: |
[Emacs-diffs] trunk r113339: Handle errno and exit status a bit more carefully. |
|
Date: |
Tue, 09 Jul 2013 07:04:58 +0000 |
|
User-agent: |
Bazaar (2.6b2) |
------------------------------------------------------------
revno: 113339
revision-id: address@hidden
parent: address@hidden
committer: Paul Eggert <address@hidden>
branch nick: trunk
timestamp: Tue 2013-07-09 00:04:48 -0700
message:
Handle errno and exit status a bit more carefully.
* lib/ignore-value.h: Remove this gnulib-imported file.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* admin/merge-gnulib (GNULIB_MODULES): Remove ignore-value.
* src/callproc.c (child_setup) [!DOS_NT]: Don't try to stuff an error
number into an exit status. Instead, use EXIT_CANCELED.
(child_setup) [!MSDOS]: Avoid possible deadlock with vfork.
* src/callproc.c (relocate_fd):
* src/emacs.c (close_output_streams, main):
* src/process.c (create_process):
* src/sysdep.c (sys_subshell) [!DOS_NT || !WINDOWSNT]:
Use emacs_perror for simplicity.
* src/callproc.c (relocate_fd, main):
* src/sysdep.c (sys_subshell):
Exit with EXIT_CANCELED etc., not 1, when exec setup fails.
(shut_down_emacs): Use emacs_write, not write.
* src/emacs.c, src/sysdep.c: Don't include <ignore-value.h>.
* src/fileio.c (Fcopy_file, e_write):
* src/nsterm.m (ns_select):
* src/process.c (send_process):
* src/sound.c (vox_write):
Use emacs_write_sig, not emacs_write.
* src/lisp.h (emacs_write_sig, emacs_perror): New decls.
* src/process.h (EXIT_CANCELED), EXIT_CANNOT_INVOKE, EXIT_ENOENT):
New constants.
* src/sysdep.c (emacs_backtrace): Use emacs_write, not ignore_value
of write.
(emacs_full_write): New function.
(emacs_write): Rewrite to use it.
(emacswrite_sig, emacs_perror): New functions.
* src/xrdb.c (fatal): Don't invoke perror, since errno might be garbage.
removed:
lib/ignore-value.h ignorevalue.h-20110203213725-87ii79ljgr9ngwp2-1
modified:
ChangeLog changelog-20091113204419-o5vbwnq5f7feedwu-1538
admin/ChangeLog changelog-20091113204419-o5vbwnq5f7feedwu-2226
admin/merge-gnulib mergegnulib-20120521022411-ndnoaiok33j6dn0g-1
lib/gnulib.mk gnulib.mk-20110108211121-3ig4un4ogtyyca3s-7
m4/gnulib-comp.m4 glcomp.m4-20110127072028-6mkjqxjzdsx0wp15-1
src/ChangeLog changelog-20091113204419-o5vbwnq5f7feedwu-1438
src/callproc.c callproc.c-20091113204419-o5vbwnq5f7feedwu-248
src/emacs.c emacs.c-20091113204419-o5vbwnq5f7feedwu-241
src/fileio.c fileio.c-20091113204419-o5vbwnq5f7feedwu-210
src/lisp.h lisp.h-20091113204419-o5vbwnq5f7feedwu-253
src/nsterm.m nsterm.m-20091113204419-o5vbwnq5f7feedwu-8747
src/process.c process.c-20091113204419-o5vbwnq5f7feedwu-462
src/process.h process.h-20091113204419-o5vbwnq5f7feedwu-272
src/sound.c sound.c-20091113204419-o5vbwnq5f7feedwu-1323
src/sysdep.c sysdep.c-20091113204419-o5vbwnq5f7feedwu-448
src/xrdb.c xrdb.c-20091113204419-o5vbwnq5f7feedwu-177
=== modified file 'ChangeLog'
--- a/ChangeLog 2013-07-08 13:26:13 +0000
+++ b/ChangeLog 2013-07-09 07:04:48 +0000
@@ -1,3 +1,9 @@
+2013-07-09 Paul Eggert <address@hidden>
+
+ Handle errno and exit status a bit more carefully.
+ * lib/ignore-value.h: Remove this gnulib-imported file.
+ * lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
+
2013-07-08 Magnus Henoch <address@hidden> (tiny change)
* configure.ac (HAVE_IMAGEMAGICK): Check on NS also (Bug#14798).
=== modified file 'admin/ChangeLog'
--- a/admin/ChangeLog 2013-07-07 18:00:14 +0000
+++ b/admin/ChangeLog 2013-07-09 07:04:48 +0000
@@ -1,3 +1,8 @@
+2013-07-09 Paul Eggert <address@hidden>
+
+ Handle error numbers a bit more reliably.
+ * merge-gnulib (GNULIB_MODULES): Remove ignore-value.
+
2013-07-07 Paul Eggert <address@hidden>
Make file descriptors close-on-exec when possible (Bug#14803).
=== modified file 'admin/merge-gnulib'
--- a/admin/merge-gnulib 2013-07-07 18:00:14 +0000
+++ b/admin/merge-gnulib 2013-07-09 07:04:48 +0000
@@ -31,7 +31,7 @@
dtoastr dtotimespec dup2 environ execinfo faccessat
fcntl fcntl-h fdatasync fdopendir filemode fstatat fsync
getloadavg getopt-gnu gettime gettimeofday
- ignore-value intprops largefile lstat
+ intprops largefile lstat
manywarnings memrchr mktime
pipe2 pselect pthread_sigmask putenv qacl readlink readlinkat
sig2str socklen stat-time stdalign stdarg stdbool stdio
=== modified file 'lib/gnulib.mk'
--- a/lib/gnulib.mk 2013-07-07 18:00:14 +0000
+++ b/lib/gnulib.mk 2013-07-09 07:04:48 +0000
@@ -21,7 +21,7 @@
# the same distribution terms as the rest of that program.
#
# Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib
--m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux
--avoid=binary-io --avoid=close --avoid=dup --avoid=fchdir --avoid=fstat
--avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=open
--avoid=openat-die --avoid=opendir --avoid=raise --avoid=save-cwd
--avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib
--makefile-name=gnulib.mk --conditional-dependencies --no-libtool
--macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat
close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr
dtotimespec dup2 environ execinfo faccessat fcntl fcntl-h fdatasync fdopendir
filemode fstatat fsync getloadavg getopt-gnu gettime gettimeofday ignore-value
intprops largefile lstat manywarnings memrchr mktime pipe2 pselect
pthread_sigmask putenv qacl readlink readlinkat sig2str socklen stat-time
stdalign stdarg stdbool stdio strftime strtoimax strtoumax symlink sys_stat
sys_time time timer-time timespec-add timespec-sub unsetenv utimens warnings
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib
--m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux
--avoid=binary-io --avoid=close --avoid=dup --avoid=fchdir --avoid=fstat
--avoid=malloc-posix --avoid=msvc-inval --avoid=msvc-nothrow --avoid=open
--avoid=openat-die --avoid=opendir --avoid=raise --avoid=save-cwd
--avoid=select --avoid=sigprocmask --avoid=sys_types --avoid=threadlib
--makefile-name=gnulib.mk --conditional-dependencies --no-libtool
--macro-prefix=gl --no-vc-files alloca-opt c-ctype c-strcase careadlinkat
close-stream crypto/md5 crypto/sha1 crypto/sha256 crypto/sha512 dtoastr
dtotimespec dup2 environ execinfo faccessat fcntl fcntl-h fdatasync fdopendir
filemode fstatat fsync getloadavg getopt-gnu gettime gettimeofday intprops
largefile lstat manywarnings memrchr mktime pipe2 pselect pthread_sigmask
putenv qacl readlink readlinkat sig2str socklen stat-time stdalign stdarg
stdbool stdio strftime strtoimax strtoumax symlink sys_stat sys_time time
timer-time timespec-add timespec-sub unsetenv utimens warnings
MOSTLYCLEANFILES += core *.stackdump
@@ -485,13 +485,6 @@
## end gnulib module group-member
-## begin gnulib module ignore-value
-
-
-EXTRA_DIST += ignore-value.h
-
-## end gnulib module ignore-value
-
## begin gnulib module intprops
=== removed file 'lib/ignore-value.h'
--- a/lib/ignore-value.h 2013-07-01 23:43:19 +0000
+++ b/lib/ignore-value.h 1970-01-01 00:00:00 +0000
@@ -1,48 +0,0 @@
-/* ignore a function return without a compiler warning
-
- Copyright (C) 2008-2013 Free Software Foundation, Inc.
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
-
-/* Written by Jim Meyering, Eric Blake and Pádraig Brady. */
-
-/* Use "ignore_value" to avoid a warning when using a function declared with
- gcc's warn_unused_result attribute, but for which you really do want to
- ignore the result. Traditionally, people have used a "(void)" cast to
- indicate that a function's return value is deliberately unused. However,
- if the function is declared with __attribute__((warn_unused_result)),
- gcc issues a warning even with the cast.
-
- Caution: most of the time, you really should heed gcc's warning, and
- check the return value. However, in those exceptional cases in which
- you're sure you know what you're doing, use this function.
-
- For the record, here's one of the ignorable warnings:
- "copy.c:233: warning: ignoring return value of 'fchown',
- declared with attribute warn_unused_result". */
-
-#ifndef _GL_IGNORE_VALUE_H
-#define _GL_IGNORE_VALUE_H
-
-/* The __attribute__((__warn_unused_result__)) feature
- is available in gcc versions 3.4 and newer,
- while the typeof feature has been available since 2.7 at least. */
-#if 3 < __GNUC__ + (4 <= __GNUC_MINOR__)
-# define ignore_value(x) \
- (__extension__ ({ __typeof__ (x) __x = (x); (void) __x; }))
-#else
-# define ignore_value(x) ((void) (x))
-#endif
-
-#endif
=== modified file 'm4/gnulib-comp.m4'
--- a/m4/gnulib-comp.m4 2013-07-07 18:00:14 +0000
+++ b/m4/gnulib-comp.m4 2013-07-09 07:04:48 +0000
@@ -80,7 +80,6 @@
# Code from module gettime:
# Code from module gettimeofday:
# Code from module group-member:
- # Code from module ignore-value:
# Code from module include_next:
# Code from module intprops:
# Code from module inttypes-incomplete:
@@ -798,7 +797,6 @@
lib/gettime.c
lib/gettimeofday.c
lib/group-member.c
- lib/ignore-value.h
lib/intprops.h
lib/inttypes.in.h
lib/lstat.c
=== modified file 'src/ChangeLog'
--- a/src/ChangeLog 2013-07-08 13:26:13 +0000
+++ b/src/ChangeLog 2013-07-09 07:04:48 +0000
@@ -1,3 +1,34 @@
+2013-07-09 Paul Eggert <address@hidden>
+
+ Handle errno and exit status a bit more carefully.
+ * callproc.c (child_setup) [!DOS_NT]: Don't try to stuff an error
+ number into an exit status. Instead, use EXIT_CANCELED.
+ (child_setup) [!MSDOS]: Avoid possible deadlock with vfork.
+ * callproc.c (relocate_fd):
+ * emacs.c (close_output_streams, main):
+ * process.c (create_process):
+ * sysdep.c (sys_subshell) [!DOS_NT || !WINDOWSNT]:
+ Use emacs_perror for simplicity.
+ * callproc.c (relocate_fd, main):
+ * sysdep.c (sys_subshell):
+ Exit with EXIT_CANCELED etc., not 1, when exec setup fails.
+ (shut_down_emacs): Use emacs_write, not write.
+ * emacs.c, sysdep.c: Don't include <ignore-value.h>.
+ * fileio.c (Fcopy_file, e_write):
+ * nsterm.m (ns_select):
+ * process.c (send_process):
+ * sound.c (vox_write):
+ Use emacs_write_sig, not emacs_write.
+ * lisp.h (emacs_write_sig, emacs_perror): New decls.
+ * process.h (EXIT_CANCELED), EXIT_CANNOT_INVOKE, EXIT_ENOENT):
+ New constants.
+ * sysdep.c (emacs_backtrace): Use emacs_write, not ignore_value
+ of write.
+ (emacs_full_write): New function.
+ (emacs_write): Rewrite to use it.
+ (emacswrite_sig, emacs_perror): New functions.
+ * xrdb.c (fatal): Don't invoke perror, since errno might be garbage.
+
2013-07-08 Magnus Henoch <address@hidden> (tiny change).
* image.c (imagemagick_load_image): Do not use MagickExportImagePixels
=== modified file 'src/callproc.c'
--- a/src/callproc.c 2013-07-07 18:48:16 +0000
+++ b/src/callproc.c 2013-07-09 07:04:48 +0000
@@ -1221,7 +1221,7 @@
are changed between the check and this chdir, but we should
at least check. */
if (chdir (temp) < 0)
- _exit (errno);
+ _exit (EXIT_CANCELED);
#else /* DOS_NT */
/* Get past the drive letter, so that d:/ is left alone. */
if (i > 2 && IS_DEVICE_SEP (temp[1]) && IS_DIRECTORY_SEP (temp[2]))
@@ -1366,10 +1366,12 @@
execve (new_argv[0], new_argv, env);
- emacs_write (1, "Can't exec program: ", 20);
- emacs_write (1, new_argv[0], strlen (new_argv[0]));
- emacs_write (1, "\n", 1);
- _exit (1);
+ /* Don't output the program name here, as it can be arbitrarily long,
+ and a long write from a vforked child to its parent can cause a
+ deadlock. */
+ emacs_perror ("child process");
+
+ _exit (errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE);
#else /* MSDOS */
pid = run_msdos_command (new_argv, pwd_var + 4, in, out, err, env);
@@ -1395,13 +1397,8 @@
int new = fcntl (fd, F_DUPFD_CLOEXEC, minfd);
if (new == -1)
{
- const char *message_1 = "Error while setting up child: ";
- const char *errmessage = strerror (errno);
- const char *message_2 = "\n";
- emacs_write (2, message_1, strlen (message_1));
- emacs_write (2, errmessage, strlen (errmessage));
- emacs_write (2, message_2, strlen (message_2));
- _exit (1);
+ emacs_perror ("while setting up child");
+ _exit (EXIT_CANCELED);
}
emacs_close (fd);
return new;
=== modified file 'src/emacs.c'
--- a/src/emacs.c 2013-07-07 18:48:16 +0000
+++ b/src/emacs.c 2013-07-09 07:04:48 +0000
@@ -28,7 +28,6 @@
#include <unistd.h>
#include <close-stream.h>
-#include <ignore-value.h>
#include "lisp.h"
@@ -646,9 +645,7 @@
{
if (close_stream (stdout) != 0)
{
- fprintf (stderr, "Write error to standard output: %s\n",
- strerror (errno));
- fflush (stderr);
+ emacs_perror ("Write error to standard output");
_exit (EXIT_FAILURE);
}
@@ -789,7 +786,7 @@
execvp (argv[0], argv);
/* If the exec fails, try to dump anyway. */
- perror ("execvp");
+ emacs_perror (argv[0]);
}
#endif /* HAVE_PERSONALITY_LINUX32 */
@@ -1020,8 +1017,8 @@
}
if (f < 0)
{
- fprintf (stderr, "Cannot fork!\n");
- exit (1);
+ emacs_perror ("fork");
+ exit (EXIT_CANCELED);
}
#ifdef DAEMON_MUST_EXEC
@@ -1038,14 +1035,14 @@
if (! (0 <= fdStrlen && fdStrlen < sizeof fdStr))
{
fprintf (stderr, "daemon: child name too long\n");
- exit (1);
+ exit (EXIT_CANNOT_INVOKE);
}
argv[skip_args] = fdStr;
execvp (argv[0], argv);
- fprintf (stderr, "emacs daemon: exec failed: %d\n", errno);
- exit (1);
+ emacs_perror (argv[0]);
+ exit (errno == ENOENT : EXIT_ENOENT : EXIT_CANNOT_INVOKE);
}
/* In exec'd: parse special dname into pipe and name info. */
@@ -1053,7 +1050,7 @@
|| strlen (dname_arg) < 1 || strlen (dname_arg) > 70)
{
fprintf (stderr, "emacs daemon: daemon name absent or too long\n");
- exit (1);
+ exit (EXIT_CANNOT_INVOKE);
}
dname_arg2[0] = '\0';
sscanf (dname_arg, "\n%d,%d\n%s", &(daemon_pipe[0]), &(daemon_pipe[1]),
@@ -1916,8 +1913,8 @@
char buf[sizeof format - 2 + INT_STRLEN_BOUND (int)];
int buflen = sprintf (buf, format, sig);
char const *sig_desc = safe_strsignal (sig);
- ignore_value (write (STDERR_FILENO, buf, buflen));
- ignore_value (write (STDERR_FILENO, sig_desc, strlen (sig_desc)));
+ emacs_write (STDERR_FILENO, buf, buflen);
+ emacs_write (STDERR_FILENO, sig_desc, strlen (sig_desc));
}
}
}
=== modified file 'src/fileio.c'
--- a/src/fileio.c 2013-07-06 02:40:50 +0000
+++ b/src/fileio.c 2013-07-09 07:04:48 +0000
@@ -2122,7 +2122,7 @@
immediate_quit = 1;
QUIT;
while ((n = emacs_read (ifd, buf, sizeof buf)) > 0)
- if (emacs_write (ofd, buf, n) != n)
+ if (emacs_write_sig (ofd, buf, n) != n)
report_file_error ("I/O error", Fcons (newname, Qnil));
immediate_quit = 0;
@@ -5317,12 +5317,10 @@
if (coding->produced > 0)
{
- coding->produced
- -= emacs_write (desc,
- STRINGP (coding->dst_object)
- ? SSDATA (coding->dst_object)
- : (char *) BYTE_POS_ADDR (coding->dst_pos_byte),
- coding->produced);
+ char *buf = (STRINGP (coding->dst_object)
+ ? SSDATA (coding->dst_object)
+ : (char *) BYTE_POS_ADDR (coding->dst_pos_byte));
+ coding->produced -= emacs_write_sig (desc, buf, coding->produced);
if (coding->produced)
return 0;
=== modified file 'src/lisp.h'
--- a/src/lisp.h 2013-07-09 05:04:45 +0000
+++ b/src/lisp.h 2013-07-09 07:04:48 +0000
@@ -3998,6 +3998,7 @@
extern void syms_of_process (void);
extern void setup_process_coding_systems (Lisp_Object);
+/* Defined in callproc.c. */
#ifndef DOS_NT
_Noreturn
#endif
@@ -4090,6 +4091,8 @@
extern int emacs_close (int);
extern ptrdiff_t emacs_read (int, char *, ptrdiff_t);
extern ptrdiff_t emacs_write (int, const char *, ptrdiff_t);
+extern ptrdiff_t emacs_write_sig (int, char const *, ptrdiff_t);
+extern void emacs_perror (char const *);
extern void unlock_all_files (void);
extern void lock_file (Lisp_Object);
=== modified file 'src/nsterm.m'
--- a/src/nsterm.m 2013-07-07 18:00:14 +0000
+++ b/src/nsterm.m 2013-07-09 07:04:48 +0000
@@ -3603,7 +3603,7 @@
/* Inform fd_handler that select should be called */
c = 'g';
- emacs_write (selfds[1], &c, 1);
+ emacs_write_sig (selfds[1], &c, 1);
}
else if (nr == 0 && timeout)
{
@@ -3636,7 +3636,7 @@
if (nr > 0 && readfds)
{
c = 's';
- emacs_write (selfds[1], &c, 1);
+ emacs_write_sig (selfds[1], &c, 1);
}
unblock_input ();
=== modified file 'src/process.c'
--- a/src/process.c 2013-07-07 23:22:43 +0000
+++ b/src/process.c 2013-07-09 07:04:48 +0000
@@ -1752,7 +1752,7 @@
tcgetattr (xforkin, &t);
t.c_lflag = LDISC1;
if (tcsetattr (xforkin, TCSANOW, &t) < 0)
- emacs_write (1, "create_process/tcsetattr LDISC1 failed\n", 39);
+ emacs_perror ("create_process/tcsetattr LDISC1");
}
#else
#if defined (NTTYDISC) && defined (TIOCSETD)
@@ -1799,10 +1799,8 @@
if (xforkin < 0)
{
- emacs_write (1, "Couldn't open the pty terminal ", 31);
- emacs_write (1, pty_name, strlen (pty_name));
- emacs_write (1, "\n", 1);
- _exit (1);
+ emacs_perror (pty_name);
+ _exit (EXIT_CANCELED);
}
}
@@ -5503,7 +5501,7 @@
written = emacs_gnutls_write (p, cur_buf, cur_len);
else
#endif
- written = emacs_write (outfd, cur_buf, cur_len);
+ written = emacs_write_sig (outfd, cur_buf, cur_len);
rv = (written ? 0 : -1);
#ifdef ADAPTIVE_READ_BUFFERING
if (p->read_output_delay > 0
=== modified file 'src/process.h'
--- a/src/process.h 2013-06-27 14:47:52 +0000
+++ b/src/process.h 2013-07-09 07:04:48 +0000
@@ -198,6 +198,14 @@
extern Lisp_Object QCbytesize, QCstopbits, QCparity, Qodd, Qeven;
extern Lisp_Object QCflowcontrol, Qhw, Qsw, QCsummary;
+/* Exit statuses for GNU programs that exec other programs. */
+enum
+{
+ EXIT_CANCELED = 125, /* Internal error prior to exec attempt. */
+ EXIT_CANNOT_INVOKE = 126, /* Program located, but not usable. */
+ EXIT_ENOENT = 127 /* Could not find program to exec. */
+};
+
/* Defined in callproc.c. */
extern void block_child_signal (void);
=== modified file 'src/sound.c'
--- a/src/sound.c 2013-06-19 14:20:26 +0000
+++ b/src/sound.c 2013-07-09 07:04:48 +0000
@@ -879,7 +879,7 @@
static void
vox_write (struct sound_device *sd, const char *buffer, ptrdiff_t nbytes)
{
- if (emacs_write (sd->fd, buffer, nbytes) != nbytes)
+ if (emacs_write_sig (sd->fd, buffer, nbytes) != nbytes)
sound_perror ("Error writing to sound device");
}
=== modified file 'src/sysdep.c'
--- a/src/sysdep.c 2013-07-07 18:00:14 +0000
+++ b/src/sysdep.c 2013-07-09 07:04:48 +0000
@@ -31,7 +31,6 @@
#include <unistd.h>
#include <c-ctype.h>
-#include <ignore-value.h>
#include <utimens.h>
#include "lisp.h"
@@ -538,8 +537,8 @@
if (str && chdir ((char *) str) != 0)
{
#ifndef DOS_NT
- ignore_value (write (1, "Can't chdir\n", 12));
- _exit (1);
+ emacs_perror ((char *) str);
+ _exit (EXIT_CANCELED);
#endif
}
@@ -570,8 +569,8 @@
write (1, "Can't execute subshell", 22);
#else /* not WINDOWSNT */
execlp (sh, sh, (char *) 0);
- ignore_value (write (1, "Can't execute subshell", 22));
- _exit (1);
+ emacs_perror (sh);
+ _exit (errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE);
#endif /* not WINDOWSNT */
#endif /* not MSDOS */
}
@@ -2134,10 +2133,10 @@
if (npointers)
{
- ignore_value (write (STDERR_FILENO, "\nBacktrace:\n", 12));
+ emacs_write (STDERR_FILENO, "\nBacktrace:\n", 12);
backtrace_symbols_fd (buffer, npointers, STDERR_FILENO);
if (bounded_limit < npointers)
- ignore_value (write (STDERR_FILENO, "...\n", 4));
+ emacs_write (STDERR_FILENO, "...\n", 4);
}
}
@@ -2246,27 +2245,26 @@
}
/* Write to FILEDES from a buffer BUF with size NBYTE, retrying if interrupted
- or if a partial write occurs. Return the number of bytes written, setting
+ or if a partial write occurs. If interrupted, process pending
+ signals if PROCESS SIGNALS. Return the number of bytes written, setting
errno if this is less than NBYTE. */
-ptrdiff_t
-emacs_write (int fildes, const char *buf, ptrdiff_t nbyte)
+static ptrdiff_t
+emacs_full_write (int fildes, char const *buf, ptrdiff_t nbyte,
+ bool process_signals)
{
- ssize_t rtnval;
- ptrdiff_t bytes_written;
-
- bytes_written = 0;
+ ptrdiff_t bytes_written = 0;
while (nbyte > 0)
{
- rtnval = write (fildes, buf, min (nbyte, MAX_RW_COUNT));
+ ssize_t n = write (fildes, buf, min (nbyte, MAX_RW_COUNT));
- if (rtnval < 0)
+ if (n < 0)
{
if (errno == EINTR)
{
/* I originally used `QUIT' but that might causes files to
be truncated if you hit C-g in the middle of it. --Stef */
- if (pending_signals)
+ if (process_signals && pending_signals)
process_pending_signals ();
continue;
}
@@ -2274,12 +2272,57 @@
break;
}
- buf += rtnval;
- nbyte -= rtnval;
- bytes_written += rtnval;
- }
-
- return (bytes_written);
+ buf += n;
+ nbyte -= n;
+ bytes_written += n;
+ }
+
+ return bytes_written;
+}
+
+/* Write to FILEDES from a buffer BUF with size NBYTE, retrying if
+ interrupted or if a partial write occurs. Return the number of
+ bytes written, setting errno if this is less than NBYTE. */
+ptrdiff_t
+emacs_write (int fildes, char const *buf, ptrdiff_t nbyte)
+{
+ return emacs_full_write (fildes, buf, nbyte, 0);
+}
+
+/* Like emacs_write, but also process pending signals if interrupted. */
+ptrdiff_t
+emacs_write_sig (int fildes, char const *buf, ptrdiff_t nbyte)
+{
+ return emacs_full_write (fildes, buf, nbyte, 1);
+}
+
+/* Write a diagnostic to standard error that contains MESSAGE and a
+ string derived from errno. Preserve errno. Do not buffer stderr.
+ Do not process pending signals if interrupted. */
+void
+emacs_perror (char const *message)
+{
+ int err = errno;
+ char const *error_string = strerror (err);
+ char const *command = (initial_argv && initial_argv[0]
+ ? initial_argv[0] : "emacs");
+ /* Write it out all at once, if it's short; this is less likely to
+ be interleaved with other output. */
+ char buf[BUFSIZ];
+ int nbytes = snprintf (buf, sizeof buf, "%s: %s: %s\n",
+ command, message, error_string);
+ if (0 <= nbytes && nbytes < BUFSIZ)
+ emacs_write (STDERR_FILENO, buf, nbytes);
+ else
+ {
+ emacs_write (STDERR_FILENO, command, strlen (command));
+ emacs_write (STDERR_FILENO, ": ", 2);
+ emacs_write (STDERR_FILENO, message, strlen (message));
+ emacs_write (STDERR_FILENO, ": ", 2);
+ emacs_write (STDERR_FILENO, error_string, strlen (error_string));
+ emacs_write (STDERR_FILENO, "\n", 1);
+ }
+ errno = err;
}
/* Return a struct timeval that is roughly equivalent to T.
=== modified file 'src/xrdb.c'
--- a/src/xrdb.c 2013-01-02 16:13:04 +0000
+++ b/src/xrdb.c 2013-07-09 07:04:48 +0000
@@ -634,10 +634,7 @@
static void
fatal (char *msg, char *prog)
{
- if (errno)
- perror (prog);
-
- (void) fprintf (stderr, msg, prog);
+ fprintf (stderr, msg, prog);
exit (1);
}
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- [Emacs-diffs] trunk r113339: Handle errno and exit status a bit more carefully.,
Paul Eggert <=