| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Copyright (C) 2007 Erik Andersen <andersen@uclibc.org> |
| 4 | * |
| 5 | * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. |
| 6 | */ |
| 7 | |
| 8 | #include <features.h> |
| 9 | |
| 10 | #if defined __USE_SVID || defined __USE_XOPEN |
| 11 | # include <string.h> |
| 12 | # include <sys/types.h> |
| 13 | # include <sys/wait.h> |
| 14 | # include <sys/syscall.h> |
| 15 | |
| 16 | # ifdef __NR_waitid |
| 17 | |
| 18 | # ifdef __UCLIBC_HAS_THREADS_NATIVE__ |
| 19 | # include <sysdep-cancel.h> |
| 20 | # else |
| 21 | # define SINGLE_THREAD_P 1 |
| 22 | # endif |
| 23 | |
| 24 | /* The waitid() POSIX interface takes 4 arguments, but the kernel function |
| 25 | * actually takes 5. The fifth is a pointer to struct rusage. Make sure |
| 26 | * we pass NULL rather than letting whatever was in the register bleed up. |
| 27 | */ |
| 28 | #define __NR_waitid5 __NR_waitid |
| 29 | static __always_inline |
| 30 | _syscall5(int, waitid5, idtype_t, idtype, id_t, id, siginfo_t*, infop, |
| 31 | int, options, struct rusage*, ru) |
| 32 | # endif |
| 33 | |
| 34 | int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options) |
| 35 | { |
| 36 | # ifdef __NR_waitid |
| 37 | if (SINGLE_THREAD_P) |
| 38 | return waitid5(idtype, id, infop, options, NULL); |
| 39 | |
| 40 | # ifdef __UCLIBC_HAS_THREADS_NATIVE__ |
| 41 | int oldtype = LIBC_CANCEL_ASYNC (); |
| 42 | int result = waitid5(idtype, id, infop, options, NULL); |
| 43 | LIBC_CANCEL_RESET (oldtype); |
| 44 | return result; |
| 45 | # endif |
| 46 | |
| 47 | # elif defined __NR_waitpid |
| 48 | switch (idtype) { |
| 49 | case P_PID: |
| 50 | if (id <= 0) |
| 51 | goto invalid; |
| 52 | break; |
| 53 | case P_PGID: |
| 54 | if (id < 0 || id == 1) |
| 55 | goto invalid; |
| 56 | id = -id; |
| 57 | break; |
| 58 | case P_ALL: |
| 59 | id = -1; |
| 60 | break; |
| 61 | default: |
| 62 | invalid: |
| 63 | __set_errno(EINVAL); |
| 64 | return -1; |
| 65 | } |
| 66 | |
| 67 | memset(infop, 0, sizeof *infop); |
| 68 | infop->si_pid = waitpid(id, &infop->si_status, options |
| 69 | # ifdef WEXITED |
| 70 | &~ WEXITED |
| 71 | # endif |
| 72 | ); |
| 73 | if (infop->si_pid < 0) |
| 74 | return infop->si_pid; |
| 75 | return 0; |
| 76 | # else |
| 77 | __set_errno(ENOSYS); |
| 78 | return -1; |
| 79 | # endif |
| 80 | } |
| 81 | #endif |