1 /* SPDX-License-Identifier: LGPL-2.1 OR MIT */ 2 /* 3 * wait definitions for NOLIBC 4 * Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu> 5 */ 6 7 /* make sure to include all global symbols */ 8 #include "../nolibc.h" 9 10 #ifndef _NOLIBC_SYS_WAIT_H 11 #define _NOLIBC_SYS_WAIT_H 12 13 #include "../arch.h" 14 #include "../std.h" 15 #include "../types.h" 16 17 /* 18 * pid_t wait(int *status); 19 * pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage); 20 * pid_t waitpid(pid_t pid, int *status, int options); 21 * int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options); 22 */ 23 24 static __attribute__((unused)) 25 pid_t sys_wait4(pid_t pid, int *status, int options, struct rusage *rusage) 26 { 27 #ifdef __NR_wait4 28 return my_syscall4(__NR_wait4, pid, status, options, rusage); 29 #else 30 return __nolibc_enosys(__func__, pid, status, options, rusage); 31 #endif 32 } 33 34 static __attribute__((unused)) 35 pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage) 36 { 37 return __sysret(sys_wait4(pid, status, options, rusage)); 38 } 39 40 static __attribute__((unused)) 41 int sys_waitid(int which, pid_t pid, siginfo_t *infop, int options, struct rusage *rusage) 42 { 43 return my_syscall5(__NR_waitid, which, pid, infop, options, rusage); 44 } 45 46 static __attribute__((unused)) 47 int waitid(int which, pid_t pid, siginfo_t *infop, int options) 48 { 49 return __sysret(sys_waitid(which, pid, infop, options, NULL)); 50 } 51 52 53 static __attribute__((unused)) 54 pid_t waitpid(pid_t pid, int *status, int options) 55 { 56 int idtype, ret; 57 siginfo_t info; 58 pid_t id; 59 60 if (pid == INT_MIN) { 61 SET_ERRNO(ESRCH); 62 return -1; 63 } else if (pid < -1) { 64 idtype = P_PGID; 65 id = -pid; 66 } else if (pid == -1) { 67 idtype = P_ALL; 68 id = 0; 69 } else if (pid == 0) { 70 idtype = P_PGID; 71 id = 0; 72 } else { 73 idtype = P_PID; 74 id = pid; 75 } 76 77 options |= WEXITED; 78 79 ret = waitid(idtype, id, &info, options); 80 if (ret) 81 return -1; 82 83 switch (info.si_code) { 84 case 0: 85 *status = 0; 86 break; 87 case CLD_EXITED: 88 *status = (info.si_status & 0xff) << 8; 89 break; 90 case CLD_KILLED: 91 *status = info.si_status & 0x7f; 92 break; 93 case CLD_DUMPED: 94 *status = (info.si_status & 0x7f) | 0x80; 95 break; 96 case CLD_STOPPED: 97 case CLD_TRAPPED: 98 *status = (info.si_status << 8) + 0x7f; 99 break; 100 case CLD_CONTINUED: 101 *status = 0xffff; 102 break; 103 default: 104 return -1; 105 } 106 107 return info.si_pid; 108 } 109 110 static __attribute__((unused)) 111 pid_t wait(int *status) 112 { 113 return waitpid(-1, status, 0); 114 } 115 116 #endif /* _NOLIBC_SYS_WAIT_H */ 117