5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html}
7 Gnulib module: open, fchdir
9 Portability problems fixed by the Gnulib module @code{open}:
12 Some platforms do not support @code{O_CLOEXEC}:
13 @c See posix-headers/fcntl.texi for the list.
14 Mac OS X 10.6, FreeBSD 8.4, NetBSD 5.1, OpenBSD 4.9, Minix 3.1.8, AIX 7.1, HP-UX 11, IRIX 6.5, Solaris 10, Cygwin 1.7.x, mingw, MSVC 14.
16 On platforms where @code{off_t} is a 32-bit type, @code{open} may not work
17 correctly with files larger than 2 GB@. (Cf. @code{AC_SYS_LARGEFILE}.)
19 This function does not fail when the file name argument ends in a slash
20 and (without the slash) names a nonexistent file or a file that is not a
21 directory, on some platforms:
22 Mac OS X 10.13, FreeBSD 7.2, AIX 7.1, HP-UX 11.00, Solaris 9.
24 This function does not support the @code{O_NONBLOCK} flag when it is defined
25 by the gnulib module @code{nonblocking} on some platforms:
28 On Windows platforms (excluding Cygwin), this function does usually not
29 recognize the @file{/dev/null} filename.
32 Portability problems fixed by the Gnulib module @code{fchdir}:
35 On Windows platforms (excluding Cygwin), this function fails to open a
36 read-only descriptor for directories.
39 Portability problems not fixed by Gnulib:
42 The Gnulib replacement for @code{O_CLOEXEC} is not atomic, and so is
43 not safe in the presence of multiple threads or signal handlers.
45 @code{open ("symlink", O_NOFOLLOW ...)} fails with @code{errno} set to
46 @code{EMLINK} instead of the POSIX-required @code{ELOOP} on some
50 @code{open ("symlink", O_NOFOLLOW ...)} fails with @code{errno} set to
51 @code{EFTYPE} instead of the POSIX-required @code{ELOOP} on some
55 On Windows, this function returns a file handle in @code{O_TEXT} mode by
56 default; this means that it translates @code{'\n'} to CR/LF by default. Use the
57 @code{O_BINARY} flag if you need reliable binary I/O.