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42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/* Determine the session ID of the controlling terminal of the current process.
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Copyright (C) 2010-2021 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 3 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#define USE_OLD_TTY /* needed on OpenBSD 4.5, so that TIOCGSID gets defined */
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/* Specification. */
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#include <termios.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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pid_t
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tcgetsid (int fd)
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{
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#ifdef TIOCGSID /* Mac OS X, OpenBSD */
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int sid;
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if (ioctl (fd, TIOCGSID, &sid) < 0)
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return -1; /* errno is set here */
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return sid;
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#else /* FreeBSD, Cygwin, mingw */
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errno = ENOSYS;
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return -1;
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#endif
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}
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