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 #include "pty-private.h"
  12
  13
  14 /* Close all file descriptors except the one specified.  */
  15 static void
  16 close_all_fds (void)
  17 {
  18   DIR *dir = __opendir ("/proc/self/fd");
  19   if (dir != NULL)
  20     {
  21       struct dirent64 *d;
  22       while ((d = __readdir64 (dir)) != NULL)
  23         if (isdigit (d->d_name[0]))
  24           {
  25             char *endp;
  26             long int fd = strtol (d->d_name, &endp, 10);
  27             if (*endp == '\0' && fd != PTY_FILENO && fd != dirfd (dir))
  28               close_not_cancel_no_status (fd);
  29           }
  30
  31       __closedir (dir);
  32
  33       int nullfd = open_not_cancel_2 (_PATH_DEVNULL, O_RDONLY);
  34       assert (nullfd == STDIN_FILENO);
  35       nullfd = open_not_cancel_2 (_PATH_DEVNULL, O_WRONLY);
  36       assert (nullfd == STDOUT_FILENO);
  37       __dup2 (STDOUT_FILENO, STDERR_FILENO);
  38     }
  39 }
  40 #define CLOSE_ALL_FDS() close_all_fds()
  41
  42 #include <sysdeps/unix/grantpt.c>