| @node openat |
| @section @code{openat} |
| @findex openat |
| |
| POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/openat.html} |
| |
| Gnulib module: openat |
| |
| Portability problems fixed by Gnulib: |
| @itemize |
| @item |
| This function is missing on some platforms: |
| glibc 2.3.6, Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, |
| AIX 5.1, HP-UX 11, IRIX 6.5, Cygwin 1.5.x, mingw, MSVC 14. |
| But the replacement function is not safe to be used in libraries and is not multithread-safe. |
| @item |
| Some platforms do not support @code{O_CLOEXEC}: |
| AIX 7.1, Solaris 10. |
| @item |
| On platforms where @code{off_t} is a 32-bit type, @code{open} may not work |
| correctly with files larger than 2 GB. (Cf. @code{AC_SYS_LARGEFILE}.) |
| @item |
| This function does not fail when the file name argument ends in a slash |
| and (without the slash) names a nonexistent file or a file that is not a |
| directory, on some platforms: |
| Solaris 9. |
| @end itemize |
| |
| Portability problems not fixed by Gnulib: |
| @itemize |
| @item |
| The Gnulib replacement for @code{O_CLOEXEC} is not atomic, and so is |
| not safe in the presence of multiple threads or signal handlers. |
| @item |
| @code{openat (fd, "symlink", O_NOFOLLOW ...)} fails with @code{errno} |
| set to @code{EMLINK} instead of the POSIX-required @code{ELOOP} on |
| some platforms: |
| FreeBSD 10.1. |
| @item |
| @code{openat (fd, "symlink", O_NOFOLLOW ...)} fails with @code{errno} |
| set to @code{EFTYPE} instead of the POSIX-required @code{ELOOP} on |
| some platforms: |
| NetBSD 6.1. |
| @end itemize |