/*
* If we detect that stdio cannot handle file descriptors above 255, this
* functions tries to reassign 'fd' to a file descriptor above 255 in order to
* reserve lower file descriptors for stdio. File descriptors below 3 or above
* 255 are returned as-is. The original file descriptor is closed if it was
* reassigned. On systems which do not need this workaround, the original
* file descriptor is returned.
*
* @note The FD_CLOEXEC flag set will be cleared on the new file descriptor if
* the file descriptor is successfully reassigned.
*
* @return On success a new file descriptor above 255 is returned.
* On failure or if reassigning was not necessary the original file
* descriptor is returned.
*/
int
fd_get_non_stdio(int fd)
{
if (fd_need_non_stdio() && fd > 2 && fd < 256) {
int nfd, saved_errno;
saved_errno = errno;
nfd = fcntl(fd, F_DUPFD, 256);
if (nfd > 0) {
close(fd);
compat_socket_duped(fd, nfd);
fd = nfd;
}
errno = saved_errno;
}
/*
* On Windows, files and sockets do not share the same ID space.
* Therefore, on that platform we use this routine as a hook to
* record active socket descriptors in a table.
* --RAM, 2015-04-05
*/
if (is_running_on_mingw()) {
/* We don't expect thread race conditions here */
if G_UNLIKELY(NULL == fd_sockets)
fd_sockets = hset_create(HASH_KEY_SELF, 0);
if (is_a_socket(fd))
hset_insert(fd_sockets, int_to_pointer(fd));
}
return fd;
}
/*
* If we detect that stdio cannot handle file descriptors above 255, this
* functions tries to reassign 'fd' to a file descriptor above 255 in order to
* reserve lower file descriptors for stdio. File descriptors below 3 or above
* 255 are returned as-is. The original file descriptor is closed if it was
* reassigned. On systems which do not need this workaround, the original
* file descriptor is returned.
*
* @note The FD_CLOEXEC flag set will be cleared on the new file descriptor if
* the file descriptor is successfully reassigned.
*
* @return On success a new file descriptor above 255 is returned.
* On failure or if reassigning was not necessary the original file
* descriptor is returned.
*/
int
get_non_stdio_fd(int fd)
{
if (need_get_non_stdio_fd() && fd > 2 && fd < 256) {
int nfd, saved_errno;
saved_errno = errno;
nfd = fcntl(fd, F_DUPFD, 256);
if (nfd > 0) {
close(fd);
compat_socket_duped(fd, nfd);
fd = nfd;
}
errno = saved_errno;
}
return fd;
}
