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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [termios/] [tcgetsid.c] - Rev 1325
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/* Copyright (C) 1997, 1999 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <errno.h> #include <termios.h> #include <sys/ioctl.h> #include <sys/types.h> #define __USE_XOPEN_EXTENDED #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; }
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