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* m4/printf.m4 (gl_PRINTF_INFINITE_LONG_DOUBLE): Don't guess yes on
NetBSD; the test fails on NetBSD 5.0.
* doc/{glibc,posix,pastposix}-{headers,functions}/*.texi: Update info
about NetBSD.
58 lines
2.0 KiB
Plaintext
58 lines
2.0 KiB
Plaintext
@node utimensat
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@section @code{utimensat}
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@findex utimensat
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/utimensat.html}
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Gnulib module: utimensat
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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glibc 2.3.6, MacOS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, AIX
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5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw,
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Interix 3.5, BeOS.
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However, the replacement function may end up truncating timestamps to
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less resolution than supported by the file system. Furthermore, the
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replacement function is not safe to be used in libraries and is not
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multithread-safe.
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@item
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This function returns a bogus value instead of failing with
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@code{ENOSYS} on some platforms:
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Linux kernel 2.6.21.
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@item
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This function fails with @code{ENOSYS} if passed the flag
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@code{AT_SYMLINK_NOFOLLOW} on a regular file:
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Linux kernel 2.6.22.
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@item
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When using @code{UTIME_OMIT} or @code{UTIME_NOW}, some systems require
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the @code{tv_sec} argument to be 0, and don't necessarily handle all
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file permissions in the manner required by POSIX:
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Linux kernel 2.6.25.
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@item
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When using @code{UTIME_OMIT} for the modification time, but specifying
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an access time, some systems fail to update the change time:
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Linux kernel 2.6.32.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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On some platforms, timestamps of symbolic links cannot be modified, so
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the replacement fails with @code{ENOSYS} if passed the flag
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@code{AT_SYMLINK_NOFOLLOW} on a symlink.
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@item
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The mere act of using @code{lstat} modifies the access time of
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symlinks on some platforms, so @code{utimensat} with
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@code{AT_SYMLINK_NOFOLLOW} can only effectively change modification time:
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Cygwin.
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@item
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The mere act of using @code{stat} modifies the access time of
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directories on some platforms, so @code{utimensat} can only
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effectively change directory modification time:
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Cygwin 1.5.x.
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@end itemize
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The gnulib module fdutimensat provides a similar interface.
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