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34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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/* Return the foreground process group ID of FD. */
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pid_t
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tcgetpgrp (int fd)
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{
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int pgrp;
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if (__ioctl (fd, TIOCGPGRP, &pgrp) < 0)
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return (pid_t) -1;
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return (pid_t) pgrp;
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}
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libc_hidden_def (tcgetpgrp)
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