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<syntaxhighlight lang="c">
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <signal.h>
#include <sched.h>
#define STACK_SIZE (8 * 4096)
static int ac;
static char **av;
static int ns_exec(void *_arg)
{
int fd;
fd = open("newns.log", O_CREAT | O_TRUNC | O_RDWR | O_APPEND, 0600);
if (fd >= 0) {
close(0);
dup2(fd, 1);
dup2(fd, 2);
close(fd);
}
setsid();
execvp(av[1], av + 1);
return 1;
}
int main(int argc, char **argv)
{
void *stack;
int ret;
pid_t pid;
ac = argc;
av = argv;
stack = mmap(NULL, STACK_SIZE, PROT_WRITE | PROT_READ,
MAP_PRIVATE | MAP_GROWSDOWN | MAP_ANONYMOUS, -1, 0);
if (stack == MAP_FAILED) {
fprintf(stderr, "Can't map stack %m\n");
exit(1);
}
pid = clone(ns_exec, stack + STACK_SIZE,
CLONE_NEWPID | CLONE_NEWIPC | SIGCHLD, NULL);
if (pid < 0) {
fprintf(stderr, "clone() failed: %m\n");
exit(1);
}
return 0;
}
</syntaxhighlight>
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <signal.h>
#include <sched.h>
#define STACK_SIZE (8 * 4096)
static int ac;
static char **av;
static int ns_exec(void *_arg)
{
int fd;
fd = open("newns.log", O_CREAT | O_TRUNC | O_RDWR | O_APPEND, 0600);
if (fd >= 0) {
close(0);
dup2(fd, 1);
dup2(fd, 2);
close(fd);
}
setsid();
execvp(av[1], av + 1);
return 1;
}
int main(int argc, char **argv)
{
void *stack;
int ret;
pid_t pid;
ac = argc;
av = argv;
stack = mmap(NULL, STACK_SIZE, PROT_WRITE | PROT_READ,
MAP_PRIVATE | MAP_GROWSDOWN | MAP_ANONYMOUS, -1, 0);
if (stack == MAP_FAILED) {
fprintf(stderr, "Can't map stack %m\n");
exit(1);
}
pid = clone(ns_exec, stack + STACK_SIZE,
CLONE_NEWPID | CLONE_NEWIPC | SIGCHLD, NULL);
if (pid < 0) {
fprintf(stderr, "clone() failed: %m\n");
exit(1);
}
return 0;
}
</syntaxhighlight>