about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/grantpt.c
blob: 0a3cd472fa2cbfb348e3cc460c5a2ff1fdd3e7b0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <unistd.h>

#include <not-cancel.h>

#include "pty-private.h"


/* 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_not_cancel_no_status (fd);
	  }

      __closedir (dir);

      int nullfd = open_not_cancel_2 (_PATH_DEVNULL, O_RDONLY);
      assert (nullfd == STDIN_FILENO);
      nullfd = open_not_cancel_2 (_PATH_DEVNULL, O_WRONLY);
      assert (nullfd == STDOUT_FILENO);
      __dup2 (STDOUT_FILENO, STDERR_FILENO);
    }
}
#define CLOSE_ALL_FDS() close_all_fds()

#include <sysdeps/unix/grantpt.c>