Mercurial > gnulib
view lib/login_tty.c @ 36940:c741bc27922a
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
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date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | 807a2defea28 |
children | 344018b6e5d7 |
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/* Assign a given terminal as controlling terminal and as standard input, standard output, standard error of the current process. Copyright (C) 2010-2013 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <config.h> /* Currently no specification header. */ #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> int login_tty (int slave_fd) { int i; /* Create a new session. */ setsid (); /* Make fd the controlling terminal for the current process. On BSD and OSF/1: There is ioctl TIOCSCTTY for this purpose. On Solaris: A terminal becomes the controlling terminal of a session if it is being open()ed, at a moment when 1. it is not already the controlling terminal of some session, and 2. the process that open()s it is a session leader that does not have a controlling terminal. We assume condition 1, try to ensure condition 2, and then open() it. */ for (i = 0; i < 3; i++) if (i != slave_fd) close (i); #ifdef TIOCSCTTY if (ioctl (slave_fd, TIOCSCTTY, NULL) < 0) return -1; #else { char *slave_name; int dummy_fd; slave_name = ttyname (slave_fd); if (slave_name == NULL) return -1; dummy_fd = open (slave_name, O_RDWR); if (dummy_fd < 0) return -1; close (dummy_fd); } #endif /* Assign fd to the standard input, standard output, and standard error of the current process. */ for (i = 0; i < 3; i++) if (slave_fd != i) if (dup2 (slave_fd, i) < 0) return -1; if (slave_fd >= 3) close (slave_fd); return 0; }