POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/futimens.html}
-Gnulib module: ---
+Gnulib module: futimens
Portability problems fixed by Gnulib:
@itemize
+@item
+This function is missing on some platforms:
+glibc 2.3.6, MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, AIX
+5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw,
+Interix 3.5, BeOS.
+However, the replacement function may end up truncating timestamps to
+less resolution than supported by the file system.
+@item
+This function returns a bogus value instead of failing with
+@code{ENOSYS} on some platforms:
+Linux kernel 2.6.21.
+@item
+When using @code{UTIME_OMIT} or @code{UTIME_NOW}, some systems require
+the @code{tv_sec} argument to be 0, and don't necessarily handle all
+file permissions in the manner required by POSIX:
+Linux kernel 2.6.25.
+@item
+When using @code{UTIME_OMIT} for the modification time, but specifying
+an access time, some systems fail to update the change time:
+Linux kernel 2.6.32.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
-This function is missing on some platforms:
-glibc 2.3.6, MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin, mingw, Interix 3.5, BeOS.
+Some platforms lack the ability to change the timestamps of a file
+descriptor, so the replacement can fail with @code{ENOSYS}; the gnulib
+module @samp{utimens} provides a more reliable interface @code{fdutimens}.
+@item
+The mere act of using @code{stat} modifies the access time of
+directories on some platforms, so @code{utimensat} can only
+effectively change directory modification time:
+Cygwin 1.5.x.
@end itemize
projects / gnulib.git / blobdiff