121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/* Acquire ownership of the slave side of a pseudo-terminal.
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Copyright (C) 1998-2002, 2009-2024 Free Software Foundation, Inc.
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Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
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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 2.1 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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#include <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#if HAVE_SETRLIMIT
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# include <sys/types.h>
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# include <sys/time.h>
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# include <sys/resource.h>
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#endif
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#include "configmake.h"
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#include "pty-private.h"
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#ifndef _LIBC
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# define __set_errno(e) errno = (e)
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# define __dup2 dup2
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# define __fork fork
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# define __setrlimit setrlimit
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# define __waitpid waitpid
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#endif
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int
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grantpt (int fd)
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{
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#if defined __OpenBSD__ || defined _WIN32
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/* On OpenBSD, master and slave of a pseudo-terminal are allocated together,
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through an ioctl on /dev/ptm. On Windows there are no ptys.
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Therefore in either case there is no need for grantpt(). */
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return 0;
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#else
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/* This function is most often called from a process without 'root'
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credentials. Use the helper program. */
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int retval = -1;
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pid_t pid = __fork ();
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if (pid == -1)
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goto cleanup;
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else if (pid == 0)
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{
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/* This is executed in the child process. */
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# if HAVE_SETRLIMIT && defined RLIMIT_CORE
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/* Disable core dumps. */
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struct rlimit rl = { 0, 0 };
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__setrlimit (RLIMIT_CORE, &rl);
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# endif
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/* We pass the master pseudo terminal as file descriptor PTY_FILENO. */
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if (fd != PTY_FILENO)
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if (__dup2 (fd, PTY_FILENO) < 0)
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_exit (FAIL_EBADF);
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# ifdef CLOSE_ALL_FDS
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CLOSE_ALL_FDS ();
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# endif
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execle (_PATH_PT_CHOWN, strrchr (_PATH_PT_CHOWN, '/') + 1, NULL, NULL);
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_exit (FAIL_EXEC);
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}
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else
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{
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int w;
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if (__waitpid (pid, &w, 0) == -1)
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goto cleanup;
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if (!WIFEXITED (w))
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__set_errno (ENOEXEC);
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else
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switch (WEXITSTATUS (w))
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{
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case 0:
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retval = 0;
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break;
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case FAIL_EBADF:
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__set_errno (EBADF);
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break;
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case FAIL_EINVAL:
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__set_errno (EINVAL);
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break;
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case FAIL_EACCES:
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__set_errno (EACCES);
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break;
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case FAIL_EXEC:
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__set_errno (ENOEXEC);
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break;
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case FAIL_ENOMEM:
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__set_errno (ENOMEM);
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break;
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default:
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assert(! "getpt: internal error: invalid exit code from pt_chown");
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}
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}
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cleanup:
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return retval;
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#endif
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}
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