diff options
Diffstat (limited to 'm4/utimes.m4')
| -rw-r--r-- | m4/utimes.m4 | 135 |
1 files changed, 101 insertions, 34 deletions
diff --git a/m4/utimes.m4 b/m4/utimes.m4 index 7efb2b0..1876bec 100644 --- a/m4/utimes.m4 +++ b/m4/utimes.m4 @@ -1,6 +1,7 @@ # Detect some bugs in glibc's implementation of utimes. +# serial 4 -dnl Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. +dnl Copyright (C) 2003-2005, 2009-2016 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. @@ -19,8 +20,8 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_UTIMES], [ - AC_CACHE_CHECK([determine whether the utimes function works], - gl_cv_func_working_utimes, + AC_CACHE_CHECK([whether the utimes function works], + [gl_cv_func_working_utimes], [ AC_RUN_IFELSE([AC_LANG_SOURCE([[ #include <sys/types.h> @@ -32,45 +33,111 @@ AC_DEFUN([gl_FUNC_UTIMES], #include <stdlib.h> #include <stdio.h> #include <utime.h> +#include <errno.h> + +static int +inorder (time_t a, time_t b, time_t c) +{ + return a <= b && b <= c; +} int main () { - static struct timeval timeval[2] = {{9, 10}, {999999, 999999}}; - struct stat sbuf; + int result = 0; char const *file = "conftest.utimes"; - FILE *f; - time_t now; - int fd; + /* On OS/2, file timestamps must be on or after 1980 in local time, + with an even number of seconds. */ + static struct timeval timeval[2] = {{315620000 + 10, 10}, + {315620000 + 1000000, 999998}}; - 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); + /* Test whether utimes() essentially works. */ + { + struct stat sbuf; + FILE *f = fopen (file, "w"); + if (f == NULL) + result |= 1; + else if (fclose (f) != 0) + result |= 1; + else if (utimes (file, timeval) != 0) + result |= 2; + else if (lstat (file, &sbuf) != 0) + result |= 1; + else if (!(sbuf.st_atime == timeval[0].tv_sec + && sbuf.st_mtime == timeval[1].tv_sec)) + result |= 4; + if (unlink (file) != 0) + result |= 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); + /* Test whether utimes() with a NULL argument sets the file's timestamp + to the current time. Use 'fstat' as well as 'time' to + determine the "current" time, to accommodate NFS file systems + if there is a time skew between the host and the NFS server. */ + { + int fd = open (file, O_WRONLY|O_CREAT, 0644); + if (fd < 0) + result |= 1; + else + { + time_t t0, t2; + struct stat st0, st1, st2; + if (time (&t0) == (time_t) -1) + result |= 1; + else if (fstat (fd, &st0) != 0) + result |= 1; + else if (utimes (file, timeval) != 0 + && (errno != EACCES + /* OS/2 kLIBC utimes fails on opened files. */ + || close (fd) != 0 + || utimes (file, timeval) != 0 + || (fd = open (file, O_WRONLY)) < 0)) + result |= 2; + else if (utimes (file, NULL) != 0 + && (errno != EACCES + /* OS/2 kLIBC utimes fails on opened files. */ + || close (fd) != 0 + || utimes (file, NULL) != 0 + || (fd = open (file, O_WRONLY)) < 0)) + result |= 8; + else if (fstat (fd, &st1) != 0) + result |= 1; + else if (write (fd, "\n", 1) != 1) + result |= 1; + else if (fstat (fd, &st2) != 0) + result |= 1; + else if (time (&t2) == (time_t) -1) + result |= 1; + else + { + int m_ok_POSIX = inorder (t0, st1.st_mtime, t2); + int m_ok_NFS = inorder (st0.st_mtime, st1.st_mtime, st2.st_mtime); + if (! (st1.st_atime == st1.st_mtime)) + result |= 16; + if (! (m_ok_POSIX || m_ok_NFS)) + result |= 32; + } + if (close (fd) != 0) + result |= 1; + } + if (unlink (file) != 0) + result |= 1; + } - ok = (0 <= (fd = open (file, O_WRONLY|O_CREAT, 0444)) - && close (fd) == 0 - && utimes (file, NULL) == 0); - unlink (file); + /* Test whether utimes() with a NULL argument works on read-only files. */ + { + int fd = open (file, O_WRONLY|O_CREAT, 0444); + if (fd < 0) + result |= 1; + else if (close (fd) != 0) + result |= 1; + else if (utimes (file, NULL) != 0) + result |= 64; + if (unlink (file) != 0) + result |= 1; + } - exit (!ok); + return result; } ]])], [gl_cv_func_working_utimes=yes], @@ -78,6 +145,6 @@ main () [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. ]) + AC_DEFINE([HAVE_WORKING_UTIMES], [1], [Define if utimes works properly. ]) fi ]) |