sysdeps/unix/sysv/linux/grantpt.c

   1 #include <assert.h>
   2 #include <ctype.h>
   3 #include <dirent.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <paths.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9
  10 #include <not-cancel.h>
  11
  12 #include "pty-private.h"
  13
  14 #if HAVE_PT_CHOWN
  15 /* Close all file descriptors except the one specified.  */
  16 static void
  17 close_all_fds (void)
  18 {
  19   DIR *dir = __opendir ("/proc/self/fd");
  20   if (dir != NULL)
  21     {
  22       struct dirent64 *d;
  23       while ((d = __readdir64 (dir)) != NULL)
  24         if (isdigit (d->d_name[0]))
  25           {
  26             char *endp;
  27             long int fd = strtol (d->d_name, &endp, 10);
  28             if (*endp == '\0' && fd != PTY_FILENO && fd != dirfd (dir))
  29               close_not_cancel_no_status (fd);
  30           }
  31
  32       __closedir (dir);
  33
  34       int nullfd = open_not_cancel_2 (_PATH_DEVNULL, O_RDONLY);
  35       assert (nullfd == STDIN_FILENO);
  36       nullfd = open_not_cancel_2 (_PATH_DEVNULL, O_WRONLY);
  37       assert (nullfd == STDOUT_FILENO);
  38       __dup2 (STDOUT_FILENO, STDERR_FILENO);
  39     }
  40 }
  41 # define CLOSE_ALL_FDS() close_all_fds()
  42 #endif
  43
  44 #include <sysdeps/unix/grantpt.c>