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Bruno Haible
8fb59b8fac
* doc/posix-headers/*.texi: Add info about MSVC 14. * doc/posix-functions/*.texi: Likewise. * doc/pastposix-functions/*.texi: Likewise. * doc/glibc-headers/*.texi: Likewise. * doc/glibc-functions/*.texi: Likewise.
49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
@node futimens
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@section @code{futimens}
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@findex futimens
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/futimens.html}
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Gnulib module: futimens
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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, Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8,
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AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw, MSVC 14,
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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.
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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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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, Solaris 11.1.
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@item
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Passing @code{AT_FDCWD} as the fd argument does not properly fail with
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@code{EBADF} on some systems:
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glibc 2.11, Solaris 11.
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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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Some platforms lack the ability to change the timestamps of a file
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descriptor, so the replacement can fail with @code{ENOSYS}; the gnulib
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module @samp{utimens} provides a more reliable interface @code{fdutimens}.
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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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