1# Detect some bugs in glibc's implementation of utimes. 2 3dnl Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. 4dnl This file is free software; the Free Software Foundation 5dnl gives unlimited permission to copy and/or distribute it, 6dnl with or without modifications, as long as this notice is preserved. 7 8# See if we need to work around bugs in glibc's implementation of 9# utimes from 2003-07-12 to 2003-09-17. 10# First, there was a bug that would make utimes set mtime 11# and atime to zero (1970-01-01) unconditionally. 12# Then, there was code to round rather than truncate. 13# Then, there was an implementation (sparc64, Linux-2.4.28, glibc-2.3.3) 14# that didn't honor the NULL-means-set-to-current-time semantics. 15# Finally, there was also a version of utimes that failed on read-only 16# files, while utime worked fine (linux-2.2.20, glibc-2.2.5). 17# 18# From Jim Meyering, with suggestions from Paul Eggert. 19 20AC_DEFUN([gl_FUNC_UTIMES], 21[ 22 AC_CACHE_CHECK([determine whether the utimes function works], 23 gl_cv_func_working_utimes, 24 [ 25 AC_RUN_IFELSE([AC_LANG_SOURCE([[ 26#include <sys/types.h> 27#include <sys/stat.h> 28#include <fcntl.h> 29#include <sys/time.h> 30#include <time.h> 31#include <unistd.h> 32#include <stdlib.h> 33#include <stdio.h> 34#include <utime.h> 35 36int 37main () 38{ 39 static struct timeval timeval[2] = {{9, 10}, {999999, 999999}}; 40 struct stat sbuf; 41 char const *file = "conftest.utimes"; 42 FILE *f; 43 time_t now; 44 int fd; 45 46 int ok = ((f = fopen (file, "w")) 47 && fclose (f) == 0 48 && utimes (file, timeval) == 0 49 && lstat (file, &sbuf) == 0 50 && sbuf.st_atime == timeval[0].tv_sec 51 && sbuf.st_mtime == timeval[1].tv_sec); 52 unlink (file); 53 if (!ok) 54 exit (1); 55 56 ok = 57 ((f = fopen (file, "w")) 58 && fclose (f) == 0 59 && time (&now) != (time_t)-1 60 && utimes (file, NULL) == 0 61 && lstat (file, &sbuf) == 0 62 && now - sbuf.st_atime <= 2 63 && now - sbuf.st_mtime <= 2); 64 unlink (file); 65 if (!ok) 66 exit (1); 67 68 ok = (0 <= (fd = open (file, O_WRONLY|O_CREAT, 0444)) 69 && close (fd) == 0 70 && utimes (file, NULL) == 0); 71 unlink (file); 72 73 exit (!ok); 74} 75 ]])], 76 [gl_cv_func_working_utimes=yes], 77 [gl_cv_func_working_utimes=no], 78 [gl_cv_func_working_utimes=no])]) 79 80 if test $gl_cv_func_working_utimes = yes; then 81 AC_DEFINE([HAVE_WORKING_UTIMES], 1, [Define if utimes works properly. ]) 82 fi 83]) 84