diff options
Diffstat (limited to 'REORG.TODO/termios/tcgetsid.c')
-rw-r--r-- | REORG.TODO/termios/tcgetsid.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/REORG.TODO/termios/tcgetsid.c b/REORG.TODO/termios/tcgetsid.c new file mode 100644 index 0000000000..e49e6b12dd --- /dev/null +++ b/REORG.TODO/termios/tcgetsid.c @@ -0,0 +1,62 @@ +/* Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <termios.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <unistd.h> + +/* Return the session ID of FD. */ +pid_t +tcgetsid (int fd) +{ + pid_t pgrp; + pid_t sid; +#ifdef TIOCGSID + static int tiocgsid_does_not_work; + + if (! tiocgsid_does_not_work) + { + int serrno = errno; + int sid; + + if (__ioctl (fd, TIOCGSID, &sid) < 0) + { + if (errno == EINVAL) + { + tiocgsid_does_not_work = 1; + __set_errno (serrno); + } + else + return (pid_t) -1; + } + else + return (pid_t) sid; + } +#endif + + pgrp = tcgetpgrp (fd); + if (pgrp == -1) + return (pid_t) -1; + + sid = getsid (pgrp); + if (sid == -1 && errno == ESRCH) + __set_errno (ENOTTY); + + return sid; +} |