[CRIU] core: Implement xgetpid()
Andrei Vagin
avagin at virtuozzo.com
Mon Mar 27 18:02:03 PDT 2017
Hi All,
We have to resurrect this patch. The problem exists for all who use
glibc 2.24. For example, it fails for me too (fedora 25).
https://sourceware.org/bugzilla/show_bug.cgi?id=19957
What do you think if we will not add a new function and will just
overwrite the existing getpid()?
On Wed, Mar 15, 2017 at 08:35:52PM +0300, Kirill Tkhai wrote:
> GLibc's getpid() caches pids, and it's unreliable.
> For example, the following program returns different
> results between getpid() and syscall(__NR_getpid):
>
> parent: pid=32369
> parent: fork pid=32370
> 1)child: pid=32370
> 2)child: pid=32369
>
> Fix that by using raw xgetpid() everywhere.
>
> ***
>
> define _GNU_SOURCE
> #include <sched.h>
> #include <unistd.h>
> #include <string.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <fcntl.h>
> #include <errno.h>
> #include <sys/syscall.h>
> #include <sys/mman.h>
> #include <signal.h>
>
> int child(void *a)
> {
> printf("1)child: pid=%d\n", syscall(__NR_getpid));
> printf("2)child: pid=%d\n", getpid());
> return 0;
> }
>
> int main(void)
> {
> int stack_size = 2 * 1024 * 1024;
> char *stack = mmap(NULL, stack_size, PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
> pid_t pid;
> if (stack == MAP_FAILED) {
> perror("Can't allocate stack");
> exit(1);
> }
>
> printf("parent: pid=%d\n", getpid());
> pid = clone(child, stack + stack_size, CLONE_VM | CLONE_FILES | SIGCHLD, NULL);
> printf("parent: fork pid=%d\n", pid);
> }
>
> Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
> ---
> criu/action-scripts.c | 3 ++-
> criu/autofs.c | 9 +++++----
> criu/cgroup.c | 3 ++-
> criu/cr-check.c | 9 +++++----
> criu/cr-dump.c | 3 ++-
> criu/cr-restore.c | 9 +++++----
> criu/cr-service.c | 3 ++-
> criu/files.c | 3 ++-
> criu/image.c | 3 ++-
> criu/include/libc-wrappers.h | 12 ++++++++++++
> criu/kerndat.c | 3 ++-
> criu/log.c | 5 +++--
> criu/mount.c | 5 +++--
> criu/namespaces.c | 7 ++++---
> criu/pstree.c | 7 ++++---
> criu/shmem.c | 3 ++-
> criu/sk-unix.c | 3 ++-
> criu/tty.c | 3 ++-
> criu/util.c | 9 +++++----
> criu/vdso.c | 2 +-
> 20 files changed, 67 insertions(+), 37 deletions(-)
> create mode 100644 criu/include/libc-wrappers.h
>
> diff --git a/criu/action-scripts.c b/criu/action-scripts.c
> index 4fa8e2843..d5bab291a 100644
> --- a/criu/action-scripts.c
> +++ b/criu/action-scripts.c
> @@ -3,6 +3,7 @@
> #include <limits.h>
> #include <stdlib.h>
>
> +#include "libc-wrappers.h"
> #include "cr_options.h"
> #include "common/list.h"
> #include "xmalloc.h"
> @@ -62,7 +63,7 @@ static int run_shell_scripts(const char *action)
> }
>
> if (!(env_set & ENV_IMGDIR)) {
> - sprintf(image_dir, "/proc/%ld/fd/%d", (long) getpid(), get_service_fd(IMG_FD_OFF));
> + sprintf(image_dir, "/proc/%ld/fd/%d", (long) xgetpid(), get_service_fd(IMG_FD_OFF));
> if (setenv("CRTOOLS_IMAGE_DIR", image_dir, 1)) {
> pr_perror("Can't set CRTOOLS_IMAGE_DIR=%s", image_dir);
> return -1;
> diff --git a/criu/autofs.c b/criu/autofs.c
> index a436e9fa9..43349fb67 100644
> --- a/criu/autofs.c
> +++ b/criu/autofs.c
> @@ -16,6 +16,7 @@
> #include "crtools.h"
> #include "util.h"
>
> +#include "libc-wrappers.h"
> #include "images/autofs.pb-c.h"
>
> #define AUTOFS_OPT_UNKNOWN INT_MIN
> @@ -295,7 +296,7 @@ static int autofs_revisit_options(struct mount_info *pm)
> return -ENOMEM;
> }
>
> - f = fopen_proc(getpid(), "mountinfo");
> + f = fopen_proc(xgetpid(), "mountinfo");
> if (!f)
> goto free_str;
>
> @@ -787,12 +788,12 @@ static int autofs_post_open(struct file_desc *d, int fd)
>
> if (i->entry->has_read_fd) {
> pr_info("%s: pid %d, closing write end %d\n", __func__,
> - getpid(), i->entry->fd);
> + xgetpid(), i->entry->fd);
> close(i->entry->fd);
> }
>
> pr_info("%s: pid %d, closing artificial pipe end %d\n", __func__,
> - getpid(), fd);
> + xgetpid(), fd);
> close(fd);
> return 0;
> }
> @@ -940,7 +941,7 @@ static int autofs_add_mount_info(void *data)
>
> if (entry->fd == -1)
> /* Catatonic mounts have no owner. Keep them with init. */
> - master = pstree_item_by_virt(getpid());
> + master = pstree_item_by_virt(xgetpid());
> else
> master = pstree_item_by_virt(entry->pgrp);
> BUG_ON(!master);
> diff --git a/criu/cgroup.c b/criu/cgroup.c
> index a1b3eb23f..36f0cbd4e 100644
> --- a/criu/cgroup.c
> +++ b/criu/cgroup.c
> @@ -23,6 +23,7 @@
> #include "protobuf.h"
> #include "images/core.pb-c.h"
> #include "images/cgroup.pb-c.h"
> +#include "libc-wrappers.h"
>
> /*
> * This structure describes set of controller groups
> @@ -642,7 +643,7 @@ int dump_task_cgroup(const struct pstree_item *item, u32 *cg_id, struct parasite
> if (item)
> pid = item->pid->real;
> else
> - pid = getpid();
> + pid = xgetpid();
>
> pr_info("Dumping cgroups for %d\n", pid);
> if (parse_task_cgroup(pid, args, &ctls, &n_ctls))
> diff --git a/criu/cr-check.c b/criu/cr-check.c
> index c8261255f..ca5e8de6d 100644
> --- a/criu/cr-check.c
> +++ b/criu/cr-check.c
> @@ -49,6 +49,7 @@
> #include "cr_options.h"
> #include "libnetlink.h"
> #include "net.h"
> +#include "libc-wrappers.h"
> #include "linux/userfaultfd.h"
> #include "restorer.h"
>
> @@ -172,7 +173,7 @@ static int check_sock_peek_off(void)
>
> static int check_kcmp(void)
> {
> - int ret = syscall(SYS_kcmp, getpid(), -1, -1, -1, -1);
> + int ret = syscall(SYS_kcmp, xgetpid(), -1, -1, -1, -1);
>
> if (ret < 0 && errno == ENOSYS) {
> pr_perror("System call kcmp is not supported");
> @@ -266,7 +267,7 @@ static int check_proc_stat(void)
> struct proc_pid_stat stat;
> int ret;
>
> - ret = parse_pid_stat(getpid(), &stat);
> + ret = parse_pid_stat(xgetpid(), &stat);
> if (ret) {
> pr_msg("procfs: stat extension is not supported\n");
> return -1;
> @@ -544,7 +545,7 @@ static int check_sigqueuinfo()
>
> signal(SIGUSR1, SIG_IGN);
>
> - if (syscall(SYS_rt_sigqueueinfo, getpid(), SIGUSR1, &info) < 0) {
> + if (syscall(SYS_rt_sigqueueinfo, xgetpid(), SIGUSR1, &info) < 0) {
> pr_perror("Unable to send siginfo with positive si_code to itself");
> return -1;
> }
> @@ -1135,7 +1136,7 @@ int cr_check(void)
> if (root_item == NULL)
> return -1;
>
> - root_item->pid->real = getpid();
> + root_item->pid->real = xgetpid();
>
> if (collect_pstree_ids())
> return -1;
> diff --git a/criu/cr-dump.c b/criu/cr-dump.c
> index 5f1f668bb..be51b2095 100644
> --- a/criu/cr-dump.c
> +++ b/criu/cr-dump.c
> @@ -32,6 +32,7 @@
> #include "images/file-lock.pb-c.h"
> #include "images/rlimit.pb-c.h"
> #include "images/siginfo.pb-c.h"
> +#include "libc-wrappers.h"
>
> #include "common/list.h"
> #include "imgset.h"
> @@ -786,7 +787,7 @@ static int collect_pstree_ids_predump(void)
> */
>
> crt.i.pid->state = TASK_ALIVE;
> - crt.i.pid->real = getpid();
> + crt.i.pid->real = xgetpid();
>
> if (predump_task_ns_ids(&crt.i))
> return -1;
> diff --git a/criu/cr-restore.c b/criu/cr-restore.c
> index d0a970bc5..a9a4f3e4a 100644
> --- a/criu/cr-restore.c
> +++ b/criu/cr-restore.c
> @@ -93,6 +93,7 @@
> #include "images/rlimit.pb-c.h"
> #include "images/pagemap.pb-c.h"
> #include "images/siginfo.pb-c.h"
> +#include "libc-wrappers.h"
>
> #include "restore.h"
>
> @@ -1200,7 +1201,7 @@ static void restore_sid(void)
> exit(1);
> }
> } else {
> - sid = getsid(getpid());
> + sid = getsid(xgetpid());
> if (sid != current->sid) {
> /* Skip the root task if it's not init */
> if (current == root_item && vpid(root_item) != INIT_PID)
> @@ -1300,7 +1301,7 @@ static int create_children_and_session(void)
> if (!restore_before_setsid(child))
> continue;
>
> - BUG_ON(child->born_sid != -1 && getsid(getpid()) != child->born_sid);
> + BUG_ON(child->born_sid != -1 && getsid(xgetpid()) != child->born_sid);
>
> ret = fork_with_pid(child);
> if (ret < 0)
> @@ -1348,7 +1349,7 @@ static int restore_task_with_children(void *_arg)
> goto err;
> }
>
> - pid = getpid();
> + pid = xgetpid();
> if (vpid(current) != pid) {
> pr_err("Pid %d do not match expected %d\n", pid, vpid(current));
> set_task_cr_err(EEXIST);
> @@ -1737,7 +1738,7 @@ static int prepare_userns_hook(void)
> * inside container due to permissions.
> * But you still can set this value if it was unset.
> */
> - saved_loginuid = parse_pid_loginuid(getpid(), &ret, false);
> + saved_loginuid = parse_pid_loginuid(xgetpid(), &ret, false);
> if (ret < 0)
> return -1;
>
> diff --git a/criu/cr-service.c b/criu/cr-service.c
> index 69e1a5557..5de91af0b 100644
> --- a/criu/cr-service.c
> +++ b/criu/cr-service.c
> @@ -39,6 +39,7 @@
> #include <sys/un.h>
> #include <sys/socket.h>
> #include "common/scm.h"
> +#include "libc-wrappers.h"
>
> #include "setproctitle.h"
>
> @@ -1153,7 +1154,7 @@ int cr_service(bool daemon_mode)
> }
>
> if (opts.pidfile) {
> - if (write_pidfile(getpid()) == -1) {
> + if (write_pidfile(xgetpid()) == -1) {
> pr_perror("Can't write pidfile");
> goto err;
> }
> diff --git a/criu/files.c b/criu/files.c
> index d68c7057b..8124db4c8 100644
> --- a/criu/files.c
> +++ b/criu/files.c
> @@ -48,6 +48,7 @@
> #include "util.h"
> #include "images/fs.pb-c.h"
> #include "images/ext-file.pb-c.h"
> +#include "libc-wrappers.h"
>
> #include "plugin.h"
>
> @@ -638,7 +639,7 @@ int restore_fown(int fd, FownEntry *fown)
> {
> struct f_owner_ex owner;
> uid_t uids[3];
> - pid_t pid = getpid();
> + pid_t pid = xgetpid();
>
> if (fown->signum) {
> if (fcntl(fd, F_SETSIG, fown->signum)) {
> diff --git a/criu/image.c b/criu/image.c
> index 57d3c7b5f..615b1cc2a 100644
> --- a/criu/image.c
> +++ b/criu/image.c
> @@ -17,6 +17,7 @@
> #include "images/inventory.pb-c.h"
> #include "images/pagemap.pb-c.h"
> #include "img-remote.h"
> +#include "libc-wrappers.h"
>
> bool ns_per_id = false;
> bool img_common_magic = true;
> @@ -135,7 +136,7 @@ int prepare_inventory(InventoryEntry *he)
> }
>
> crt.i.pid->state = TASK_ALIVE;
> - crt.i.pid->real = getpid();
> + crt.i.pid->real = xgetpid();
> if (get_task_ids(&crt.i))
> return -1;
>
> diff --git a/criu/include/libc-wrappers.h b/criu/include/libc-wrappers.h
> new file mode 100644
> index 000000000..d38875433
> --- /dev/null
> +++ b/criu/include/libc-wrappers.h
> @@ -0,0 +1,12 @@
> +#ifndef __LIBC_WRAPPERS
> +#define __LIBC_WRAPPERS
> +
> +#include <sys/syscall.h>
> +#include <unistd.h>
> +
> +static inline int xgetpid()
> +{
> + return (int)syscall(__NR_getpid);
> +}
> +
> +#endif
> diff --git a/criu/kerndat.c b/criu/kerndat.c
> index 162ac28bd..205014bf3 100644
> --- a/criu/kerndat.c
> +++ b/criu/kerndat.c
> @@ -31,6 +31,7 @@
> #include <compel/plugins/std/syscall-codes.h>
> #include <compel/compel.h>
> #include "linux/userfaultfd.h"
> +#include "libc-wrappers.h"
>
> struct kerndat_s kdat = {
> };
> @@ -289,7 +290,7 @@ int kerndat_get_dirty_track(void)
> * was at least once re-set. (this is to be removed in
> * a couple of kernel releases)
> */
> - ret = do_task_reset_dirty_track(getpid());
> + ret = do_task_reset_dirty_track(xgetpid());
> if (ret < 0)
> return ret;
> if (ret == 1)
> diff --git a/criu/log.c b/criu/log.c
> index a2beabdb0..77abdb4f5 100644
> --- a/criu/log.c
> +++ b/criu/log.c
> @@ -20,6 +20,7 @@
> #include "rst-malloc.h"
> #include "common/lock.h"
> #include "string.h"
> +#include "libc-wrappers.h"
>
> #define DEFAULT_LOGFD STDERR_FILENO
> /* Enable timestamps if verbosity is increased from default */
> @@ -182,14 +183,14 @@ int log_init_by_pid(void)
> reset_buf_off();
>
> if (!opts.log_file_per_pid) {
> - buf_off += snprintf(buffer + buf_off, sizeof buffer - buf_off, "%6d: ", getpid());
> + buf_off += snprintf(buffer + buf_off, sizeof buffer - buf_off, "%6d: ", xgetpid());
> return 0;
> }
>
> if (!opts.output)
> return 0;
>
> - snprintf(path, PATH_MAX, "%s.%d", opts.output, getpid());
> + snprintf(path, PATH_MAX, "%s.%d", opts.output, xgetpid());
>
> return log_init(path);
> }
> diff --git a/criu/mount.c b/criu/mount.c
> index 147001bcf..850d5bae3 100644
> --- a/criu/mount.c
> +++ b/criu/mount.c
> @@ -28,6 +28,7 @@
> #include "external.h"
>
> #include "images/mnt.pb-c.h"
> +#include "libc-wrappers.h"
>
> /*
> * Put a : in here since those are invalid on
> @@ -1721,7 +1722,7 @@ static int apply_sb_flags(void *args, int fd, pid_t pid)
>
> snprintf(path, sizeof(path), "/proc/self/fd/%d", fd);
>
> - if (pid != getpid() && switch_ns(pid, &mnt_ns_desc, &rst))
> + if (pid != xgetpid() && switch_ns(pid, &mnt_ns_desc, &rst))
> return -1;
>
> err = mount(NULL, path, NULL, MS_REMOUNT | flags, NULL);
> @@ -2429,7 +2430,7 @@ static int rst_collect_local_mntns(enum ns_type typ)
> {
> struct ns_id *nsid;
>
> - nsid = rst_new_ns_id(0, getpid(), &mnt_ns_desc, typ);
> + nsid = rst_new_ns_id(0, xgetpid(), &mnt_ns_desc, typ);
> if (!nsid)
> return -1;
>
> diff --git a/criu/namespaces.c b/criu/namespaces.c
> index a4c3063db..b89e70c4b 100644
> --- a/criu/namespaces.c
> +++ b/criu/namespaces.c
> @@ -33,6 +33,7 @@
> #include "common/scm.h"
> #include "fdstore.h"
> #include "proc_parse.h"
> +#include "libc-wrappers.h"
>
> static struct ns_desc *ns_desc_array[] = {
> &net_ns_desc,
> @@ -402,7 +403,7 @@ static unsigned int generate_ns_id(int pid, unsigned int kid, struct ns_desc *nd
> if (nsid)
> goto found;
>
> - if (pid != getpid()) {
> + if (pid != xgetpid()) {
> type = NS_OTHER;
> if (pid == root_item->pid->real) {
> BUG_ON(root_ns_mask & nd->cflag);
> @@ -1442,7 +1443,7 @@ static inline void unsc_msg_init(struct unsc_msg *m, uns_call_t *c,
> ch->cmsg_type = SCM_CREDENTIALS;
>
> ucred = (struct ucred *) CMSG_DATA(ch);
> - ucred->pid = getpid();
> + ucred->pid = xgetpid();
> ucred->uid = getuid();
> ucred->gid = getgid();
>
> @@ -1564,7 +1565,7 @@ int __userns_call(const char *func_name, uns_call_t call, int flags,
> }
>
> if (!usernsd_pid)
> - return call(arg, fd, getpid());
> + return call(arg, fd, xgetpid());
>
> sk = get_service_fd(USERNSD_SK);
> pr_debug("uns: calling %s (%d, %x)\n", func_name, fd, flags);
> diff --git a/criu/pstree.c b/criu/pstree.c
> index f86b75a70..8d60d5349 100644
> --- a/criu/pstree.c
> +++ b/criu/pstree.c
> @@ -22,6 +22,7 @@
> #include "protobuf.h"
> #include "images/pstree.pb-c.h"
> #include "crtools.h"
> +#include "libc-wrappers.h"
>
> struct pstree_item *root_item;
> static struct rb_root pid_root_rb;
> @@ -333,8 +334,8 @@ int dump_pstree(struct pstree_item *root_item)
>
> static int prepare_pstree_for_shell_job(void)
> {
> - pid_t current_sid = getsid(getpid());
> - pid_t current_gid = getpgid(getpid());
> + pid_t current_sid = getsid(xgetpid());
> + pid_t current_gid = getpgid(xgetpid());
>
> struct pstree_item *pi;
>
> @@ -651,7 +652,7 @@ static int prepare_pstree_ids(void)
> struct pstree_item *item, *child, *helper, *tmp;
> LIST_HEAD(helpers);
>
> - pid_t current_pgid = getpgid(getpid());
> + pid_t current_pgid = getpgid(xgetpid());
>
> /*
> * Some task can be reparented to init. A helper task should be added
> diff --git a/criu/shmem.c b/criu/shmem.c
> index 21a9d8b9e..568279977 100644
> --- a/criu/shmem.c
> +++ b/criu/shmem.c
> @@ -25,6 +25,7 @@
> #include "pstree.h"
> #include "protobuf.h"
> #include "images/pagemap.pb-c.h"
> +#include "libc-wrappers.h"
>
> #ifndef SEEK_DATA
> #define SEEK_DATA 3
> @@ -557,7 +558,7 @@ static int open_shmem(int pid, struct vma_area *vma)
> }
>
> if (f == -1) {
> - f = open_proc_rw(getpid(), "map_files/%lx-%lx",
> + f = open_proc_rw(xgetpid(), "map_files/%lx-%lx",
> (unsigned long) addr,
> (unsigned long) addr + si->size);
> if (f < 0)
> diff --git a/criu/sk-unix.c b/criu/sk-unix.c
> index a44d9985c..d17c759c9 100644
> --- a/criu/sk-unix.c
> +++ b/criu/sk-unix.c
> @@ -31,6 +31,7 @@
>
> #include "protobuf.h"
> #include "images/sk-unix.pb-c.h"
> +#include "libc-wrappers.h"
>
> #undef LOG_PREFIX
> #define LOG_PREFIX "sk unix: "
> @@ -1005,7 +1006,7 @@ static int bind_unix_sk(int sk, struct unix_sk_info *ui)
>
> pr_info("found duplicate unix socket bound at %s\n", addr.sun_path);
>
> - ret = snprintf(temp, sizeof(temp), "%s-%s-%d", addr.sun_path, "criu-temp", getpid());
> + ret = snprintf(temp, sizeof(temp), "%s-%s-%d", addr.sun_path, "criu-temp", xgetpid());
> /* this shouldn't happen, since sun_addr is only 108 chars long */
> if (ret < 0 || ret >= sizeof(temp)) {
> pr_err("snprintf of %s failed?\n", addr.sun_path);
> diff --git a/criu/tty.c b/criu/tty.c
> index 0ff690c82..523491e0b 100644
> --- a/criu/tty.c
> +++ b/criu/tty.c
> @@ -37,6 +37,7 @@
>
> #include "parasite-syscall.h"
> #include "parasite.h"
> +#include "libc-wrappers.h"
>
> #include "pstree.h"
> #include "fdstore.h"
> @@ -714,7 +715,7 @@ int tty_restore_ctl_terminal(struct file_desc *d, int fd)
>
> out:
> pr_info("Restore session %d by %d tty (index %d)\n",
> - info->tie->sid, (int)getpid(), index);
> + info->tie->sid, (int)xgetpid(), index);
>
> ret = tty_set_sid(slave);
> if (!ret)
> diff --git a/criu/util.c b/criu/util.c
> index 9fd8ba285..0945f1929 100644
> --- a/criu/util.c
> +++ b/criu/util.c
> @@ -50,6 +50,7 @@
> #include "cr_options.h"
> #include "servicefd.h"
> #include "cr-service.h"
> +#include "libc-wrappers.h"
> #include "files.h"
>
> #include "cr-errno.h"
> @@ -255,7 +256,7 @@ static inline void set_proc_self_fd(int fd)
> close(open_proc_self_fd);
>
> open_proc_self_fd = fd;
> - open_proc_self_pid = getpid();
> + open_proc_self_pid = xgetpid();
> }
>
> static inline int set_proc_pid_fd(int pid, int fd)
> @@ -275,7 +276,7 @@ static inline int set_proc_pid_fd(int pid, int fd)
> static inline int get_proc_fd(int pid)
> {
> if (pid == PROC_SELF) {
> - if (open_proc_self_fd != -1 && open_proc_self_pid != getpid()) {
> + if (open_proc_self_fd != -1 && open_proc_self_pid != xgetpid()) {
> close(open_proc_self_fd);
> open_proc_self_fd = -1;
> }
> @@ -399,7 +400,7 @@ int init_service_fd(void)
> * conflict with any 'real-life' ones
> */
>
> - if (syscall(__NR_prlimit64, getpid(), RLIMIT_NOFILE, NULL, &rlimit)) {
> + if (syscall(__NR_prlimit64, xgetpid(), RLIMIT_NOFILE, NULL, &rlimit)) {
> pr_perror("Can't get rlimit");
> return -1;
> }
> @@ -834,7 +835,7 @@ int vaddr_to_pfn(unsigned long vaddr, u64 *pfn)
> off = (vaddr / page_size()) * sizeof(u64);
> ret = pread(fd, pfn, sizeof(*pfn), off);
> if (ret != sizeof(*pfn)) {
> - pr_perror("Can't read pme for pid %d", getpid());
> + pr_perror("Can't read pme for pid %d", xgetpid());
> ret = -1;
> } else {
> *pfn &= PME_PFRAME_MASK;
> diff --git a/criu/vdso.c b/criu/vdso.c
> index 770853514..68d7be046 100644
> --- a/criu/vdso.c
> +++ b/criu/vdso.c
> @@ -380,7 +380,7 @@ static void compat_vdso_helper(struct vdso_symtable *native, int pipe_fd,
> exit_on(-1, err_fd, "Error: Compatible vdso's size is bigger than reserved buf\n");
>
> /* Stop so CRIU could parse smaps to find 32-bit vdso's size */
> - ret = syscall(__NR_kill, syscall(__NR_getpid), SIGSTOP);
> + ret = syscall(__NR_kill, xgetpid(), SIGSTOP);
> exit_on(ret, err_fd, "Error: Can't stop myself with SIGSTOP (having a good time)\n");
>
> ret = syscall(__NR_read, pipe_fd, &vdso_addr, sizeof(void *));
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