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dup2, fcntl, fcntl-h: port to AIX 7.1 This fixes some porting problems discovered when testing the latest grep snapshot on AIX 7.1. I don't think if fixes any bugs in grep but it could be important for other applications. * doc/posix-functions/dup2.texi: * doc/posix-functions/fcntl.texi: * doc/posix-headers/fcntl.texi: Document AIX bugs. * lib/fcntl.in.h (O_CLOEXEC, O_NOFOLLOW, O_TTY_INIT) [_AIX]: Define to 0 if outside 'int' range. * m4/dup2.m4 (gl_FUNC_DUP2): * m4/fcntl.m4 (gl_FUNC_FCNTL): Check for getdtablesize. If it's available, test a value just outside its range instead of testing 1000000. When cross-compiling, guess that AIX will fail this improved test.
author Paul Eggert <eggert@cs.ucla.edu>
date Sat, 31 May 2014 14:07:57 -0700
parents 498a2211d839
children
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@node fcntl
@section @code{fcntl}
@findex fcntl

POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/fcntl.html}

Gnulib module: fcntl

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
mingw, MSVC 9.

@item
This function does not support @code{F_DUPFD_CLOEXEC} on some
platforms:
glibc with Linux kernels before 2.6.24,
Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, AIX 7.1, HP-UX 11,
IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11, Cygwin 1.7.1, Interix 3.5,
BeOS.
Note that the gnulib replacement code is functional but not atomic.

@item
The @code{F_DUPFD} action of this function does not reject
out-of-range targets properly on some platforms:
AIX 7.1, Cygwin 1.5.x, Haiku.

@item
The @code{F_DUPFD} action of this function mistakenly clears
FD_CLOEXEC on the source descriptor on some platforms:
Haiku.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
The replacement function does not support @code{F_SETFD},
@code{F_GETFL}, @code{F_SETFL}, @code{F_GETOWN}, @code{F_SETOWN},
@code{F_GETLK}, @code{F_SETLK}, and @code{F_SETLKW} on some platforms:
mingw, MSVC 9.
@end itemize