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 71 static inline int wait_for_pid(pid_t pid) 72 { 73 int status, ret; 74 75 again: 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 96 static inline int sys_pidfd_open(pid_t pid, unsigned int flags) 97 { 98 return syscall(__NR_pidfd_open, pid, flags); 99 } 100 101 static 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 } 106 107 static inline int sys_pidfd_getfd(int pidfd, int fd, int flags) 108 { 109 return syscall(__NR_pidfd_getfd, pidfd, fd, flags); 110 } 111 112 static 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 */ 118