Mercurial > gnulib
view lib/login_tty.c @ 40151:db994b489ff2
relocatable-prog: Use Linux code on Android.
* lib/progreloc.c: Treat Android like Linux.
author | Bruno Haible <bruno@clisp.org> |
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date | Sun, 27 Jan 2019 11:37:46 +0100 |
parents | b06060465f09 |
children |
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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) 2010-2019 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 <https://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; }