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 wait(int *status) 36 { 37 return __sysret(sys_wait4(-1, status, 0, NULL)); 38 } 39 40 static __attribute__((unused)) 41 pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage) 42 { 43 return __sysret(sys_wait4(pid, status, options, rusage)); 44 } 45 46 static __attribute__((unused)) 47 int sys_waitid(int which, pid_t pid, siginfo_t *infop, int options, struct rusage *rusage) 48 { 49 return my_syscall5(__NR_waitid, which, pid, infop, options, rusage); 50 } 51 52 static __attribute__((unused)) 53 int waitid(int which, pid_t pid, siginfo_t *infop, int options) 54 { 55 return __sysret(sys_waitid(which, pid, infop, options, NULL)); 56 } 57 58 59 static __attribute__((unused)) 60 pid_t waitpid(pid_t pid, int *status, int options) 61 { 62 int idtype, ret; 63 siginfo_t info; 64 pid_t id; 65 66 if (pid == INT_MIN) { 67 SET_ERRNO(ESRCH); 68 return -1; 69 } else if (pid < -1) { 70 idtype = P_PGID; 71 id = -pid; 72 } else if (pid == -1) { 73 idtype = P_ALL; 74 id = 0; 75 } else if (pid == 0) { 76 idtype = P_PGID; 77 id = 0; 78 } else { 79 idtype = P_PID; 80 id = pid; 81 } 82 83 options |= WEXITED; 84 85 ret = waitid(idtype, id, &info, options); 86 if (ret) 87 return ret; 88 89 switch (info.si_code) { 90 case 0: 91 *status = 0; 92 break; 93 case CLD_EXITED: 94 *status = (info.si_status & 0xff) << 8; 95 break; 96 case CLD_KILLED: 97 *status = info.si_status & 0x7f; 98 break; 99 case CLD_DUMPED: 100 *status = (info.si_status & 0x7f) | 0x80; 101 break; 102 case CLD_STOPPED: 103 case CLD_TRAPPED: 104 *status = (info.si_status << 8) + 0x7f; 105 break; 106 case CLD_CONTINUED: 107 *status = 0xffff; 108 break; 109 default: 110 return -1; 111 } 112 113 return info.si_pid; 114 } 115 116 #endif /* _NOLIBC_SYS_WAIT_H */ 117