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fcntl-h: define O_CLOEXEC and O_EXEC if not defined; use new defines * doc/posix-headers/fcntl.texi (fcntl.h): Document that O_CLOEXEC is now defined to 0 if it is not defined, like other flags. Also, O_EXEC is now defined to be O_RDONLY if O_EXEC is not defined. Similarly for O_SEARCH; this last was already true, but not documented. * lib/fcntl.in.h (O_CLOEXEC): Define to 0 if not defined. * lib/dup-safer-flag.c (O_CLOEXEC): Remove now-useless #define. * lib/dup3.c, lib/pipe2.c, tests/test-dup-safer.c, tests/test-fcntl.c: Likewise. * lib/popen-safer.c (open_noinherit): Check whether O_CLOEXEC is zero, not whether it is defined. * tests/test-dup3.c, tests/test-pipe2.c (main): Likewise. * lib/progreloc.c (find_executable): Use O_EXEC rather than O_RDONLY. * lib/open.c (open): Check for O_SEARCH as well as for O_RDONLY.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 10 Sep 2010 11:55:27 -0700
parents bb0ceefd22dc
children 3d497ee2707b
line wrap: on
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@node fcntl.h
@section @file{fcntl.h}

POSIX specification:@* @url{http://www.opengroup.org/susv3xbd/fcntl.h.html}

Gnulib module: fcntl-h

Portability problems fixed by Gnulib:
@itemize
@item
@samp{O_CLOEXEC}, @samp{O_DIRECTORY}, @samp{O_DSYNC}, @samp{O_NOCTTY},
@samp{O_NOFOLLOW}, @samp{O_NONBLOCK}, @samp{O_RSYNC}, @samp{O_SYNC},
and @samp{O_TTY_INIT} are not defined on some platforms.  Gnulib defines
these macros to 0.

@item
@samp{O_EXEC} and @samp{O_SEARCH} are not defined on some platforms.
Gnulib defines these macros to @samp{O_RDONLY}, which is typically 0.

@item
@samp{O_BINARY}, @samp{O_TEXT} (not specified by POSIX, but essential for
portability to Woe32 platforms) are defined on some platforms but not on
others.

@item
@samp{O_DIRECT}, @samp{O_NDELAY}, @samp{O_NOATIME},
and @samp{O_NOLINKS} (not specified by POSIX) are defined
on some platforms but not on others.

@item
@samp{FD_CLOEXEC}, @samp{F_DUPFD}, and @samp{F_GETFD} are not defined
on some platforms:
mingw.

@item
@samp{F_DUPFD_CLOEXEC} is not defined on some platforms:
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 1.7.1, mingw, Interix 3.5,
BeOS.

@item
@samp{AT_FDCWD}, @samp{AT_EACCESS}, @samp{AT_SYMLINK_NOFOLLOW},
@samp{AT_SYMLINK_FOLLOW}, and @samp{AT_REMOVEDIR}
are not defined on many 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 8, Cygwin 1.5.x, mingw, Interix 3.5, BeOS.

@item
@samp{AT_FDCWD} is defined with a value too large for an @code{int} on some
platforms:
Solaris 10.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
@samp{F_SETFD}, @samp{F_GETFL}, @samp{F_SETFL}, @samp{F_GETLK},
@samp{F_SETLK}, @samp{F_SETLOKW}, @samp{F_GETOWN}, and @samp{F_SETOWN}
are not defined on some platforms:
mingw.

@item
@samp{POSIX_FADV_DONTNEED}, @samp{POSIX_FADV_NOREUSE},
@samp{POSIX_FADV_NORMAL}, @samp{POSIX_FADV_RANDOM},
@samp{POSIX_FADV_SEQUENTIAL}, and @samp{POSIX_FADV_WILLNEED} are not
defined on some platforms.
@end itemize