diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/grantpt.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/grantpt.c | 73 |
1 files changed, 35 insertions, 38 deletions
diff --git a/sysdeps/unix/sysv/linux/grantpt.c b/sysdeps/unix/sysv/linux/grantpt.c index 2030e07fa6..43122f9a76 100644 --- a/sysdeps/unix/sysv/linux/grantpt.c +++ b/sysdeps/unix/sysv/linux/grantpt.c @@ -1,44 +1,41 @@ -#include <assert.h> -#include <ctype.h> -#include <dirent.h> -#include <errno.h> -#include <fcntl.h> -#include <paths.h> -#include <stdlib.h> -#include <unistd.h> +/* grantpt implementation for Linux. + Copyright (C) 1998-2020 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998. -#include <not-cancel.h> + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. -#include "pty-private.h" + The GNU C Library 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 + Lesser General Public License for more details. -#if HAVE_PT_CHOWN -/* Close all file descriptors except the one specified. */ -static void -close_all_fds (void) -{ - DIR *dir = __opendir ("/proc/self/fd"); - if (dir != NULL) - { - struct dirent64 *d; - while ((d = __readdir64 (dir)) != NULL) - if (isdigit (d->d_name[0])) - { - char *endp; - long int fd = strtol (d->d_name, &endp, 10); - if (*endp == '\0' && fd != PTY_FILENO && fd != dirfd (dir)) - __close_nocancel_nostatus (fd); - } + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <stdlib.h> +#include <sys/ioctl.h> +#include <termios.h> - __closedir (dir); +int +grantpt (int fd) +{ + /* Without pt_chown on Linux, we have delegated the creation of the + pty node with the right group and permission mode to the kernel, and + non-root users are unlikely to be able to change it. Therefore let's + consider that POSIX enforcement is the responsibility of the whole + system and not only the GNU libc. */ - int nullfd = __open_nocancel (_PATH_DEVNULL, O_RDONLY); - assert (nullfd == STDIN_FILENO); - nullfd = __open_nocancel (_PATH_DEVNULL, O_WRONLY); - assert (nullfd == STDOUT_FILENO); - __dup2 (STDOUT_FILENO, STDERR_FILENO); - } + /* Verify that fd refers to a ptmx descriptor. */ + unsigned int ptyno; + int ret = __ioctl (fd, TIOCGPTN, &ptyno); + if (ret != 0 && errno == ENOTTY) + /* POSIX requires EINVAL instead of ENOTTY provided by the kernel. */ + __set_errno (EINVAL); + return ret; } -# define CLOSE_ALL_FDS() close_all_fds() -#endif - -#include <sysdeps/unix/grantpt.c> |