mirror of https://github.com/containers/podman.git
64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
#include <dirent.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <sys/select.h>
|
|
|
|
static int open_files_max_fd;
|
|
static fd_set *open_files_set;
|
|
|
|
int
|
|
is_fd_inherited(int fd)
|
|
{
|
|
if (open_files_set == NULL || fd > open_files_max_fd || fd < 0)
|
|
return 0;
|
|
|
|
return FD_ISSET(fd % FD_SETSIZE, &(open_files_set[fd / FD_SETSIZE])) ? 1 : 0;
|
|
}
|
|
|
|
static void __attribute__((constructor)) init()
|
|
{
|
|
/* Store how many FDs were open before the Go runtime kicked in. */
|
|
DIR* d = opendir ("/dev/fd");
|
|
if (d)
|
|
{
|
|
struct dirent *ent;
|
|
size_t size = 0;
|
|
|
|
for (ent = readdir (d); ent; ent = readdir (d))
|
|
{
|
|
int fd;
|
|
|
|
if (ent->d_name[0] == '.')
|
|
continue;
|
|
|
|
fd = atoi (ent->d_name);
|
|
if (fd == dirfd (d)) {
|
|
continue;
|
|
}
|
|
|
|
if (fd >= size * FD_SETSIZE)
|
|
{
|
|
int i;
|
|
size_t new_size;
|
|
|
|
new_size = (fd / FD_SETSIZE) + 1;
|
|
open_files_set = realloc (open_files_set, new_size * sizeof (fd_set));
|
|
if (open_files_set == NULL)
|
|
_exit (EXIT_FAILURE);
|
|
|
|
for (i = size; i < new_size; i++)
|
|
FD_ZERO (&(open_files_set[i]));
|
|
|
|
size = new_size;
|
|
}
|
|
|
|
if (fd > open_files_max_fd) {
|
|
open_files_max_fd = fd;
|
|
}
|
|
|
|
FD_SET (fd % FD_SETSIZE, &(open_files_set[fd / FD_SETSIZE]));
|
|
}
|
|
}
|
|
}
|