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