1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3#ifndef __PIDFD_H
  4#define __PIDFD_H
  5
  6#define _GNU_SOURCE
  7#include <errno.h>
  8#include <fcntl.h>
  9#include <sched.h>
 10#include <signal.h>
 11#include <stdio.h>
 12#include <stdlib.h>
 13#include <string.h>
 14#include <syscall.h>
 15#include <sys/mount.h>
 16#include <sys/types.h>
 17#include <sys/wait.h>
 18
 19#include "../kselftest.h"
 20
 21#ifndef P_PIDFD
 22#define P_PIDFD 3
 23#endif
 24
 25#ifndef CLONE_NEWTIME
 26#define CLONE_NEWTIME 0x00000080
 27#endif
 28
 29#ifndef CLONE_PIDFD
 30#define CLONE_PIDFD 0x00001000
 31#endif
 32
 33#ifndef __NR_pidfd_open
 34#define __NR_pidfd_open -1
 35#endif
 36
 37#ifndef __NR_pidfd_send_signal
 38#define __NR_pidfd_send_signal -1
 39#endif
 40
 41#ifndef __NR_clone3
 42#define __NR_clone3 -1
 43#endif
 44
 45#ifndef __NR_pidfd_getfd
 46#define __NR_pidfd_getfd -1
 47#endif
 48
 49#ifndef PIDFD_NONBLOCK
 50#define PIDFD_NONBLOCK O_NONBLOCK
 51#endif
 52
 53/*
 54 * The kernel reserves 300 pids via RESERVED_PIDS in kernel/pid.c
 55 * That means, when it wraps around any pid < 300 will be skipped.
 56 * So we need to use a pid > 300 in order to test recycling.
 57 */
 58#define PID_RECYCLE 1000
 59
 60/*
 61 * Define a few custom error codes for the child process to clearly indicate
 62 * what is happening. This way we can tell the difference between a system
 63 * error, a test error, etc.
 64 */
 65#define PIDFD_PASS 0
 66#define PIDFD_FAIL 1
 67#define PIDFD_ERROR 2
 68#define PIDFD_SKIP 3
 69#define PIDFD_XFAIL 4
 70
 71int wait_for_pid(pid_t pid)
 72{
 73	int status, ret;
 74
 75again:
 76	ret = waitpid(pid, &status, 0);
 77	if (ret == -1) {
 78		if (errno == EINTR)
 79			goto again;
 80
 
 81		return -1;
 82	}
 83
 84	if (!WIFEXITED(status))
 
 
 
 85		return -1;
 
 86
 87	return WEXITSTATUS(status);
 
 88}
 89
 90static inline int sys_pidfd_open(pid_t pid, unsigned int flags)
 91{
 92	return syscall(__NR_pidfd_open, pid, flags);
 93}
 94
 95static inline int sys_pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
 96					unsigned int flags)
 97{
 98	return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);
 99}
100
101static inline int sys_pidfd_getfd(int pidfd, int fd, int flags)
102{
103	return syscall(__NR_pidfd_getfd, pidfd, fd, flags);
104}
105
106static inline int sys_memfd_create(const char *name, unsigned int flags)
107{
108	return syscall(__NR_memfd_create, name, flags);
109}
110
111#endif /* __PIDFD_H */

  1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3#ifndef __PIDFD_H
  4#define __PIDFD_H
  5
  6#define _GNU_SOURCE
  7#include <errno.h>
  8#include <fcntl.h>
  9#include <sched.h>
 10#include <signal.h>
 11#include <stdio.h>
 12#include <stdlib.h>
 13#include <string.h>
 14#include <syscall.h>
 15#include <sys/mount.h>
 16#include <sys/types.h>
 17#include <sys/wait.h>
 18
 19#include "../kselftest.h"
 20
 21#ifndef P_PIDFD
 22#define P_PIDFD 3
 23#endif
 24
 25#ifndef CLONE_NEWTIME
 26#define CLONE_NEWTIME 0x00000080
 27#endif
 28
 29#ifndef CLONE_PIDFD
 30#define CLONE_PIDFD 0x00001000
 31#endif
 32
 33#ifndef __NR_pidfd_open
 34#define __NR_pidfd_open -1
 35#endif
 36
 37#ifndef __NR_pidfd_send_signal
 38#define __NR_pidfd_send_signal -1
 39#endif
 40
 41#ifndef __NR_clone3
 42#define __NR_clone3 -1
 43#endif
 44
 45#ifndef __NR_pidfd_getfd
 46#define __NR_pidfd_getfd -1
 47#endif
 48
 49#ifndef PIDFD_NONBLOCK
 50#define PIDFD_NONBLOCK O_NONBLOCK
 51#endif
 52
 53/*
 54 * The kernel reserves 300 pids via RESERVED_PIDS in kernel/pid.c
 55 * That means, when it wraps around any pid < 300 will be skipped.
 56 * So we need to use a pid > 300 in order to test recycling.
 57 */
 58#define PID_RECYCLE 1000
 59
 60/*
 61 * Define a few custom error codes for the child process to clearly indicate
 62 * what is happening. This way we can tell the difference between a system
 63 * error, a test error, etc.
 64 */
 65#define PIDFD_PASS 0
 66#define PIDFD_FAIL 1
 67#define PIDFD_ERROR 2
 68#define PIDFD_SKIP 3
 69#define PIDFD_XFAIL 4
 70
 71static inline int wait_for_pid(pid_t pid)
 72{
 73	int status, ret;
 74
 75again:
 76	ret = waitpid(pid, &status, 0);
 77	if (ret == -1) {
 78		if (errno == EINTR)
 79			goto again;
 80
 81		ksft_print_msg("waitpid returned -1, errno=%d\n", errno);
 82		return -1;
 83	}
 84
 85	if (!WIFEXITED(status)) {
 86		ksft_print_msg(
 87		       "waitpid !WIFEXITED, WIFSIGNALED=%d, WTERMSIG=%d\n",
 88		       WIFSIGNALED(status), WTERMSIG(status));
 89		return -1;
 90	}
 91
 92	ret = WEXITSTATUS(status);
 93	return ret;
 94}
 95
 96static inline int sys_pidfd_open(pid_t pid, unsigned int flags)
 97{
 98	return syscall(__NR_pidfd_open, pid, flags);
 99}
100
101static inline int sys_pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
102					unsigned int flags)
103{
104	return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);
105}
106
107static inline int sys_pidfd_getfd(int pidfd, int fd, int flags)
108{
109	return syscall(__NR_pidfd_getfd, pidfd, fd, flags);
110}
111
112static inline int sys_memfd_create(const char *name, unsigned int flags)
113{
114	return syscall(__NR_memfd_create, name, flags);
115}
116
117#endif /* __PIDFD_H */