Mercurial > hg > octave-lojdl > gnulib-hg
annotate m4/usleep.m4 @ 15308:a3ba680ad389
strerror_r: fix OpenBSD behavior on 0
OpenBSD treats strerror_r(0,,) as a success, but with a message
"Undefined error: 0"; while this is distinct from strerror_r(-1,,)
returning "Unknown error: -1", it does not imply success. Meanwhile,
if buf is short enough for ERANGE, then we can't use strstr to look
for "Unknown" or "Undefined" in the resulting message, like we had
been doing for strerror(). Fix this by shifting the burden - now
the strerror-override code guarantees that 0 will have an
override when needed.
* lib/strerror-override.c (strerror_override): Also override 0
when needed.
* lib/strerror-override.h (strerror_override): Likewise.
* lib/strerror.c (strerror): Simplify, now that 0 override is done
earlier.
* lib/strerror_r.c (strerror_r): Likewise.
* m4/strerror.m4 (gl_FUNC_STRERROR): Split detection of 0
behavior...
(gl_FUNC_STRERROR_0): ...into new macro.
* m4/strerror_r.m4 (gl_FUNC_STRERROR_R): Replace strerror_r if 0
is overridden.
(gl_FUNC_STRERROR_R_WORKS): Avoid extra tests if 0 is broken.
* modules/strerror-override (Files): Add strerror.m4.
(configure.ac): Also provide override for 0 when needed.
* doc/posix-functions/strerror.texi (strerror): Document this.
* doc/posix-functions/perror.texi (perror): Likewise.
Signed-off-by: Eric Blake <eblake@redhat.com>
| author | Eric Blake <eblake@redhat.com> |
|---|---|
| date | Tue, 21 Jun 2011 08:50:51 -0600 |
| parents | 69ac4e993bf3 |
| children | 8250f2777afc |
| rev | line source |
|---|---|
|
15135
69ac4e993bf3
usleep: Move AC_LIBOBJ invocations to module description.
Bruno Haible <bruno@clisp.org>
parents:
14079
diff
changeset
|
1 # usleep.m4 serial 2 |
|
14079
97fc9a21a8fb
maint: update almost all copyright ranges to include 2011
Jim Meyering <meyering@redhat.com>
parents:
12559
diff
changeset
|
2 dnl Copyright (C) 2009-2011 Free Software Foundation, Inc. |
| 12315 | 3 dnl This file is free software; the Free Software Foundation |
| 4 dnl gives unlimited permission to copy and/or distribute it, | |
| 5 dnl with or without modifications, as long as this notice is preserved. | |
| 6 | |
| 7 dnl This macro intentionally does not check for select or nanosleep; | |
| 8 dnl both of those modules can require external libraries. | |
| 9 AC_DEFUN([gl_FUNC_USLEEP], | |
| 10 [ | |
| 11 AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
| 12 dnl usleep was required in POSIX 2001, but dropped as obsolete in | |
| 13 dnl POSIX 2008; therefore, it is not always exposed in headers. | |
| 14 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
| 15 AC_CHECK_FUNCS_ONCE([usleep]) | |
| 16 AC_CHECK_TYPE([useconds_t], [], | |
| 17 [AC_DEFINE([useconds_t], [unsigned int], [Define to an unsigned 32-bit | |
| 18 type if <sys/types.h> lacks this type.])]) | |
| 19 if test $ac_cv_func_usleep = no; then | |
| 20 HAVE_USLEEP=0 | |
| 21 else | |
| 22 dnl POSIX allows implementations to reject arguments larger than | |
| 23 dnl 999999, but GNU guarantees it will work. | |
| 24 AC_CACHE_CHECK([whether usleep allows large arguments], | |
| 25 [gl_cv_func_usleep_works], | |
| 26 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ | |
| 27 #include <unistd.h> | |
| 28 ]], [[return !!usleep (1000000);]])], | |
| 29 [gl_cv_func_usleep_works=yes], [gl_cv_func_usleep_works=no], | |
| 30 [gl_cv_func_usleep_works="guessing no"])]) | |
| 31 if test "$gl_cv_func_usleep_works" != yes; then | |
| 32 REPLACE_USLEEP=1 | |
| 33 fi | |
| 34 fi | |
| 35 ]) |