X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Futimes.m4;fp=m4%2Futimes.m4;h=7efb2b026c9ddf2bf9b4075ff1672e299f24d7ec;hb=0d5a754ba8f2cc33e98d48d559f0ad6cd18a43a3;hp=0000000000000000000000000000000000000000;hpb=ad96056bdcf62abd585cdb53768fbabdde75d1b5;p=debian%2Fgzip diff --git a/m4/utimes.m4 b/m4/utimes.m4 new file mode 100644 index 0000000..7efb2b0 --- /dev/null +++ b/m4/utimes.m4 @@ -0,0 +1,83 @@ +# Detect some bugs in glibc's implementation of utimes. + +dnl Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +# See if we need to work around bugs in glibc's implementation of +# utimes from 2003-07-12 to 2003-09-17. +# First, there was a bug that would make utimes set mtime +# and atime to zero (1970-01-01) unconditionally. +# Then, there was code to round rather than truncate. +# Then, there was an implementation (sparc64, Linux-2.4.28, glibc-2.3.3) +# that didn't honor the NULL-means-set-to-current-time semantics. +# Finally, there was also a version of utimes that failed on read-only +# files, while utime worked fine (linux-2.2.20, glibc-2.2.5). +# +# From Jim Meyering, with suggestions from Paul Eggert. + +AC_DEFUN([gl_FUNC_UTIMES], +[ + AC_CACHE_CHECK([determine whether the utimes function works], + gl_cv_func_working_utimes, + [ + AC_RUN_IFELSE([AC_LANG_SOURCE([[ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +int +main () +{ + static struct timeval timeval[2] = {{9, 10}, {999999, 999999}}; + struct stat sbuf; + char const *file = "conftest.utimes"; + FILE *f; + time_t now; + int fd; + + int ok = ((f = fopen (file, "w")) + && fclose (f) == 0 + && utimes (file, timeval) == 0 + && lstat (file, &sbuf) == 0 + && sbuf.st_atime == timeval[0].tv_sec + && sbuf.st_mtime == timeval[1].tv_sec); + unlink (file); + if (!ok) + exit (1); + + ok = + ((f = fopen (file, "w")) + && fclose (f) == 0 + && time (&now) != (time_t)-1 + && utimes (file, NULL) == 0 + && lstat (file, &sbuf) == 0 + && now - sbuf.st_atime <= 2 + && now - sbuf.st_mtime <= 2); + unlink (file); + if (!ok) + exit (1); + + ok = (0 <= (fd = open (file, O_WRONLY|O_CREAT, 0444)) + && close (fd) == 0 + && utimes (file, NULL) == 0); + unlink (file); + + exit (!ok); +} + ]])], + [gl_cv_func_working_utimes=yes], + [gl_cv_func_working_utimes=no], + [gl_cv_func_working_utimes=no])]) + + if test $gl_cv_func_working_utimes = yes; then + AC_DEFINE([HAVE_WORKING_UTIMES], 1, [Define if utimes works properly. ]) + fi +])