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# Detect some bugs in glibc's implementation of utimes.
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dnl Copyright (C) 2003-2005, 2009-2011 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# See if we need to work around bugs in glibc's implementation of
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# utimes from 2003-07-12 to 2003-09-17.
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# First, there was a bug that would make utimes set mtime
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# and atime to zero (1970-01-01) unconditionally.
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# Then, there was code to round rather than truncate.
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# Then, there was an implementation (sparc64, Linux-2.4.28, glibc-2.3.3)
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# that didn't honor the NULL-means-set-to-current-time semantics.
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# Finally, there was also a version of utimes that failed on read-only
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# files, while utime worked fine (linux-2.2.20, glibc-2.2.5).
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# From Jim Meyering, with suggestions from Paul Eggert.
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AC_DEFUN([gl_FUNC_UTIMES],
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AC_CACHE_CHECK([whether the utimes function works],
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[gl_cv_func_working_utimes],
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AC_RUN_IFELSE([AC_LANG_SOURCE([[
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#include <sys/types.h>
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inorder (time_t a, time_t b, time_t c)
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return a <= b && b <= c;
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char const *file = "conftest.utimes";
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static struct timeval timeval[2] = {{9, 10}, {999999, 999999}};
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/* Test whether utimes() essentially works. */
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FILE *f = fopen (file, "w");
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else if (fclose (f) != 0)
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else if (utimes (file, timeval) != 0)
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else if (lstat (file, &sbuf) != 0)
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else if (!(sbuf.st_atime == timeval[0].tv_sec
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&& sbuf.st_mtime == timeval[1].tv_sec))
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if (unlink (file) != 0)
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/* Test whether utimes() with a NULL argument sets the file's timestamp
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to the current time. Use 'fstat' as well as 'time' to
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determine the "current" time, to accommodate NFS file systems
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if there is a time skew between the host and the NFS server. */
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int fd = open (file, O_WRONLY|O_CREAT, 0644);
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struct stat st0, st1, st2;
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if (time (&t0) == (time_t) -1)
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else if (fstat (fd, &st0) != 0)
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else if (utimes (file, timeval) != 0)
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else if (utimes (file, NULL) != 0)
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else if (fstat (fd, &st1) != 0)
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else if (write (fd, "\n", 1) != 1)
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else if (fstat (fd, &st2) != 0)
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else if (time (&t2) == (time_t) -1)
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int m_ok_POSIX = inorder (t0, st1.st_mtime, t2);
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int m_ok_NFS = inorder (st0.st_mtime, st1.st_mtime, st2.st_mtime);
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if (! (st1.st_atime == st1.st_mtime))
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if (! (m_ok_POSIX || m_ok_NFS))
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if (unlink (file) != 0)
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/* Test whether utimes() with a NULL argument works on read-only files. */
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int fd = open (file, O_WRONLY|O_CREAT, 0444);
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else if (close (fd) != 0)
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else if (utimes (file, NULL) != 0)
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if (unlink (file) != 0)
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[gl_cv_func_working_utimes=yes],
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[gl_cv_func_working_utimes=no],
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[gl_cv_func_working_utimes=no])])
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if test $gl_cv_func_working_utimes = yes; then
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AC_DEFINE([HAVE_WORKING_UTIMES], [1], [Define if utimes works properly. ])