+++ /dev/null
-/* gcc -Wall -O2 -g chpid.c -o chpid */
-#define _XOPEN_SOURCE
-#define _XOPEN_SOURCE_EXTENDED
-#define _SVID_SOURCE
-#define _GNU_SOURCE
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/syscall.h>
-#include <sys/wait.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#include <sys/mount.h>
-#include <sys/vfs.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <sched.h>
-#include <stdarg.h>
-#include <dirent.h>
-
-#ifndef MNT_FORCE
-#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */
-#endif /* MNT_FORCE */
-#ifndef MNT_DETACH
-#define MNT_DETACH 0x00000002 /* Just detach from the tree */
-#endif /* MNT_DETACH */
-#ifndef MNT_EXPIRE
-#define MNT_EXPIRE 0x00000004 /* Mark for expiry */
-#endif /* MNT_EXPIRE */
-
-#ifndef MS_MOVE
-#define MS_MOVE 8192
-#endif
-#ifndef MS_REC
-#define MS_REC 16384
-#endif
-
-#ifdef OLD
-# ifndef CLONE_NPSPACE
-# define CLONE_NPSPACE 0x04000000 /* New process space */
-# endif
-# ifndef CLONE_NSYSVIPC
-# define CLONE_NSYSVIPC 0x08000000 /* New sysvipc space */
-# endif
-# ifndef CLONE_NHOST
-# define CLONE_NHOST 0x10000000 /* New networking host context (lo, hostname, etc) */
-# endif
-# ifndef CLONE_NDEV
-# define CLONE_NDEV 0x20000000 /* New hash of devices I can touch */
-# endif
-# ifndef CLONE_NUSERS
-# define CLONE_NUSERS 0x40000000 /* New users */
-# endif
-# ifndef CLONE_NTIME
-# define CLONE_NTIME 0x80000000 /* New time context??? */
-# endif
-# ifndef CLONE_NS_NOSUID
-# define CLONE_NS_NOSUID 0x00001000 /* Force MNT_NOSUID on all mounts in the namespace */
-# endif
-#endif
-
-#ifndef CLONE_NEWUTS
-#define CLONE_NEWUTS 0x04000000 /* New uts namespace (uname) */
-#endif
-#ifndef CLONE_NEWIPC
-#define CLONE_NEWIPC 0x08000000 /* New sysvipc namespace */
-#endif
-#ifndef CLONE_NEWUID
-#define CLONE_NEWUID 0x10000000 /* New users */
-#endif
-#ifndef CLONE_NEWNET
-#define CLONE_NEWNET 0x40000000 /* New network namespace (lo, device, names sockets, etc) */
-#endif
-#ifndef CLONE_NEWPID
-#define CLONE_NEWPID 0x80000000 /* New process space */
-#endif
-#ifndef CLONE_NEWTIME
-#define CLONE_NEWTIME 0x40000000 /* New time context??? */
-#endif
-#ifndef CLONE_NEWDEV
-#define CLONE_NEWDEV 0x00001000 /* New has of devices I can touch */
-#endif
-
-
-#ifndef PROC_SUPER_MAGIC
-#define PROC_SUPER_MAGIC 0x9fa0
-#endif /* PROC_SUPER_MAGIC */
-
-struct user_desc;
-static pid_t raw_clone(int flags, void *child_stack,
- int *parent_tidptr, struct user_desc *newtls, int *child_tidptr)
-{
- return syscall(__NR_clone, flags, child_stack, parent_tidptr, newtls, child_tidptr);
-}
-
-static int raw_pivot_root(const char *new_root, const char *old_root)
-{
- return syscall(__NR_pivot_root, new_root, old_root);
-}
-
-static void (*my_exit)(int status) = exit;
-
-static void die(char *fmt, ...)
-{
- va_list ap;
- va_start(ap, fmt);
- vfprintf(stderr, fmt, ap);
- va_end(ap);
- fflush(stderr);
- fflush(stdout);
- my_exit(1);
-}
-
-static void *xmalloc(size_t size)
-{
- void *ptr;
- ptr = malloc(size);
- if (!ptr) die("malloc of %d bytes failed: %s\n", size, strerror(errno));
- return ptr;
-}
-
-static void umount_buffer(char *line)
-{
- char *next, *mnt, *end, *type;
- int result;
- if (!line || !*line)
- return;
- next = strchr(line, '\n');
- *next++ = '0';
- type = line;
- mnt = strchr(line, ' ');
- *mnt++ = '\0';
- end = strchr(mnt, ' ');
- *end = '\0';
- umount_buffer(next);
-
-#if 0
- /* For debugging list what I am unounting */
- write(STDOUT_FILENO, mnt, strlen(mnt));
- write(STDOUT_FILENO, "\n", 1);
-#endif
-
- if (strcmp(type, "rootfs"))
- return;
- result = umount2(mnt, MNT_DETACH);
- if (result < 0)
- die("umount of '%s' failed: %d: %s\n",
- mnt, errno, strerror(errno));
-}
-
-static void umount_all(void)
-{
- static const char mounts[] = "/proc/self/mounts";
- char *buf;
- ssize_t bufsz, bytes;
- int fd, result;
- buf = NULL;
- bufsz = 4096;
-
- /* Temporarily mount /proc at / so I know I have it */
- result = mount("proc", "/proc", "proc", 0, NULL);
- if (result < 0)
- die("mount of proc failed: %d: %s\n",
- errno, strerror(errno));
-#if 0
- DIR *dir;
- struct dirent *entry;
- dir = opendir("/");
- while((entry = readdir(dir)) != NULL) {
- write(STDOUT_FILENO, entry->d_name, strlen(entry->d_name));
- write(STDOUT_FILENO, "\n", 1);
- }
- closedir(dir);
-#endif
- fd = open(mounts, O_RDONLY);
- if (fd < 0)
- die("open of %s failed: %d: %s\n",
- mounts, errno, strerror(errno));
-
- /* Read in all of the mount points */
- do {
- buf = xmalloc(bufsz);
- result = lseek(fd, 0, SEEK_SET);
- if (result != 0)
- die("lseek failed: %d:%s\n",
- errno, strerror(errno));
- bytes = read(fd, buf, bufsz);
- if (bytes < 0)
- die("Read of %s failed: %d:%s\n",
- mounts, errno, strerror(errno));
- if (bytes != bufsz) {
- /* Terminate the buffer */
- buf[bytes] = '\0';
- } else {
- /* Free the buffer and try again */
- free(buf);
- buf = NULL;
- bufsz <<= 1;
- }
- } while(!buf);
- /* Be good and close the file descriptor */
- result = close(fd);
- if (result < 0)
- fprintf(stderr, "close of %s failed: %d:%s\n",
- mounts, errno, strerror(errno));
-
-#if 0
- /* For debugging print the list of mounts */
- write(STDOUT_FILENO, buf, bufsz);
- write(STDOUT_FILENO, "\n\n", 2);
-#endif
-
- umount_buffer(buf);
-}
-
-int main(int argc, char **argv, char **envp)
-{
- pid_t pid;
- int status;
- struct rlimit rlim;
- int clone_flags;
- char **cmd_argv, *shell_argv[2];
- char *root = "/", *old = "/mnt";
- char *label = "none";
- int i;
- int tty, tty_force;
-
- tty = 0;
- tty_force = 0;
- clone_flags = SIGCHLD;
-
- for (i = 1; (i < argc) && (argv[i][0] == '-'); i++) {
- if (strcmp(argv[i], "--") == 0) {
- break;
- }
- else if (((argc - i) >= 2) && (strcmp(argv[i], "-r") == 0)) {
- clone_flags |= CLONE_NEWNS;
- root = argv[i + 1];
- i++;
- }
- else if (((argc - i) >= 2) && (strcmp(argv[i], "-o") == 0)) {
- old = argv[i + 1];
- i++;
- }
- else if (((argc - i) >= 2) && (strcmp(argv[i], "-l") == 0)) {
- clone_flags |= CLONE_NEWNS;
- label = argv[i + 1];
- i++;
- }
- else if (strcmp(argv[i], "-m") == 0) {
- clone_flags |= CLONE_NEWNS;
- }
- else if (strcmp(argv[i], "-h") == 0) {
- clone_flags |= CLONE_NEWUTS;
- }
- else if (strcmp(argv[i], "-i") == 0) {
- clone_flags |= CLONE_NEWIPC;
- }
- else if (strcmp(argv[i], "-n") == 0) {
- clone_flags |= CLONE_NEWNET;
- }
- else if (strcmp(argv[i], "-p") == 0) {
- clone_flags |= CLONE_NEWPID;
- }
- else if (strcmp(argv[i], "-u") == 0) {
- clone_flags |= CLONE_NEWUID;
- }
- else if (strcmp(argv[i], "-d") == 0) {
- clone_flags |= CLONE_NEWDEV;
- }
- else if (strcmp(argv[i], "-t") == 0) {
- clone_flags |= CLONE_NEWTIME;
- }
- else if (strcmp(argv[i], "--tty") == 0) {
- tty = 1;
- }
- else if (strcmp(argv[i], "--tty-force") == 0) {
- tty = 1; tty_force = 1;
- }
- else {
- die("Bad argument %s\n", argv[i]);
- }
- }
- cmd_argv = argv + i;
- if (cmd_argv[0] == NULL) {
- cmd_argv = shell_argv;
- shell_argv[0] = getenv("SHELL");
- shell_argv[1] = NULL;
- }
- if (cmd_argv[0] == NULL) {
- die("No command specified\n");
- }
-#if 1
- fprintf(stderr, "cmd_argv: %s\n", cmd_argv[0]);
-#endif
- if (root[0] != '/') {
- die("root path: '%s' not absolute\n", root);
- }
- if (old[0] != '/') {
- die("old path: '%s' not absolute\n", old);
- }
-
-#if 0
- status = getrlimit(RLIMIT_NPROC, &rlim);
- if (status < 0) {
- fprintf(stderr, "getrlimit RLIMIT_NPROC failed: %s\n",
- strerror(errno));
- exit(1);
- }
- fprintf(stderr, "RLIMIT_NPROC: %llu %llu\n",
- (unsigned long long)rlim.rlim_cur, (unsigned long long)rlim.rlim_max);
-#endif
-#if 0
- rlim.rlim_cur = 256;
- status = setrlimit(RLIMIT_NPROC, &rlim);
- if (status < 0) {
- fprintf(stderr, "setrlimit RLIMIT_NPROC %lu %lu failed: %s\n",
- (unsigned long)rlim.rlim_cur, (unsigned long)rlim.rlim_max,
- strerror(errno));
- exit(2);
- }
-#endif
- printf("Clone flags: %lx\n", clone_flags);
- pid = raw_clone(clone_flags, NULL, NULL, NULL, NULL);
- if (pid < 0) {
- fprintf(stderr, "clone_failed: pid: %d %d:%s\n",
- pid, errno, strerror(errno));
- exit(2);
- }
- if (pid == 0) {
- /* In the child */
- int result;
- my_exit = _exit;
-
- /* FIXME allocate a process inside for controlling the new process space */
- if (clone_flags & CLONE_NEWPID) {
- fprintf(stderr, "pid: %d, ppid: %d pgrp: %d sid: %d\n",
- getpid(), getppid(), getpgid(0), getsid(0));
- /* If CLONE_NEWPID isn't implemented exit */
- if (getpid() != 1)
- die("CLONE_NEWPID not implemented\n");
- }
-
- if (clone_flags & CLONE_NEWNS) {
- struct statfs stfs;
-#if 0
- if (strcmp(root, "/") != 0) {
- /* FIXME find a way to remove unreachable filesystems
- * from the namespace.
- */
- result = chdir(root);
- if (result < 0)
- die("chdir to '%s' failed: %d:%s\n",
- root, errno, strerror(errno));
- /* Convert the current working directory into a mount point */
- result = mount(".", ".", NULL, MS_BIND | MS_REC, NULL);
- if (result < 0)
- die("bind of '%s' failed: %d: %s\n",
- root, errno, strerror(errno));
- /* Update the current working directory */
- result = chdir(root);
- if (result < 0)
- die("chdir to '%s' failed: %d:%s\n",
- ".", errno, strerror(errno));
- result = mount(".", "/", NULL, MS_MOVE, NULL);
- if (result < 0)
- die("mount of '%s' failed: %d:%s\n",
- root, errno, strerror(errno));
- result = chroot(".");
- if (result < 0)
- die("chroot to '%s' failed: %d:%s\n",
- root, errno, strerror(errno));
- }
-#endif
-#if 1
- if (strcmp(root, "/") != 0) {
- char put_old[PATH_MAX];
- result = snprintf(put_old, sizeof(put_old), "%s%s", root, old);
- if (result >= sizeof(put_old))
- die("path name to long\n");
- if (result < 0)
- die("snprintf failed: %d:%s\n",
- errno, strerror(errno));
-
- /* Ensure I have a mount point at the directory I want to export */
- result = mount(root, root, NULL, MS_BIND | MS_REC, NULL);
- if (result < 0)
- die("bind of '%s' failed: %d:%s\n",
- root, errno, strerror(errno));
-
- /* Switch the mount points */
- result = raw_pivot_root(root, put_old);
- if (result < 0)
- die("pivot_root('%s', '%s') failed: %d:%s\n",
- root, put_old, errno, strerror(errno));
-
- /* Unmount all of the old mounts */
- result = umount2(old, MNT_DETACH);
- if (result < 0)
- die("umount2 of '%s' failed: %d:%s\n",
- put_old, errno, strerror(errno));
- }
-#endif
-
- result = statfs("/proc", &stfs);
- if ((result == 0) && (stfs.f_type == PROC_SUPER_MAGIC)) {
- printf ("Umounting proc\n");
- /* Unmount and remount proc so it reflects the new pid space */
- result = umount2("/proc", MNT_DETACH);
- if (result < 0)
- die("umount failed: %d:%s\n", errno, strerror(errno));
-
- result = mount(label, "/proc", "proc", 0, NULL);
- if (result < 0)
- die("mount failed: %d:%s\n",
- errno, strerror(errno));
- }
- }
- if (tty) {
- pid_t sid, pgrp;
- sid = setsid();
- if (sid < 0)
- die("setsid failed: %d:%s\n",
- errno, strerror(errno));
- fprintf(stderr, "pid: %d, ppid: %d pgrp: %d sid: %d\n",
- getpid(), getppid(), getpgid(0), getsid(0));
-
- result = ioctl(STDIN_FILENO, TIOCSCTTY, tty_force);
- if (result < 0)
- die("tiocsctty failed: %d:%s\n",
- errno, strerror(errno));
-
- pgrp = tcgetpgrp(STDIN_FILENO);
-
- fprintf(stderr, "pgrp: %d\n", pgrp);
-
- fprintf(stderr, "pid: %d, ppid: %d pgrp: %d sid: %d\n",
- getpid(), getppid(), getpgid(0), getsid(0));
-
- }
- result = execve(cmd_argv[0], cmd_argv, envp);
- die("execve of %s failed: %d:%s\n",
- cmd_argv[0], errno, strerror(errno));
- }
- /* In the parent */
- fprintf(stderr, "child pid: %d\n", pid);
- pid = waitpid(pid, &status, 0);
- fprintf(stderr, "pid: %d exited status: %d\n",
- pid, status);
- if (pid < 0) {
- fprintf(stderr, "waitpid failed: %d %s\n",
- errno, strerror(errno));
- exit(9);
- }
- if (pid == 0) {
- fprintf(stderr, "waitpid returned no pid!\n");
- exit(10);
- }
- if (WIFEXITED(status)) {
- fprintf(stderr, "pid: %d exited: %d\n",
- pid, WEXITSTATUS(status));
- }
- if (WIFSIGNALED(status)) {
- fprintf(stderr, "pid: %d exited with a uncaught signal: %d %s\n",
- pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
- }
- if (WIFSTOPPED(status)) {
- fprintf(stderr, "pid: %d stopped with signal: %d\n",
- pid, WSTOPSIG(status));
- }
- return 0;
-}
git://git.onelab.eu / linux-2.6.git / blobdiff