1 /* Definitions of status bits for `wait' et al. 2 Copyright (C) 1992,1994,1996,1997,2000,2004 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <http://www.gnu.org/licenses/>. */ 18 19 #if !defined _SYS_WAIT_H && !defined _STDLIB_H 20 # error "Never include <bits/waitstatus.h> directly; use <sys/wait.h> instead." 21 #endif 22 23 24 /* Everything extant so far uses these same bits. */ 25 26 27 /* If WIFEXITED(STATUS), the low-order 8 bits of exit(N). */ 28 #define __WEXITSTATUS(status) (((status) & 0xff00) >> 8) 29 30 /* If WIFSIGNALED(STATUS), the terminating signal. */ 31 #define __WTERMSIG(status) ((status) & 0x7f) 32 33 /* If WIFSTOPPED(STATUS), the signal that stopped the child. */ 34 #define __WSTOPSIG(status) __WEXITSTATUS(status) 35 36 /* Nonzero if STATUS indicates normal termination. */ 37 #define __WIFEXITED(status) (__WTERMSIG(status) == 0) 38 39 /* Nonzero if STATUS indicates termination by a signal. 40 * Note that status 0x007f is "died from signal 127", not "stopped by signal 0". 41 * This does happen on MIPS. 42 * The comparison is "< 0xff", not "< 0x7f", because WCOREDUMP bit (0x80) 43 * can be set too. 44 */ 45 #define __WIFSIGNALED(status) (((unsigned)((status) & 0xffff) - 1U) < 0xffU) 46 47 /* Nonzero if STATUS indicates the child is stopped. */ 48 #if !defined(__mips__) 49 #define __WIFSTOPPED(status) (((status) & 0xff) == 0x7f) 50 #else 51 #define __WIFSTOPPED(status) (((status) & 0xff) == 0x7f && ((status) & 0xff00)) 52 #endif 53 54 /* Nonzero if STATUS indicates the child continued after a stop. We only 55 define this if <bits/waitflags.h> provides the WCONTINUED flag bit. */ 56 #ifdef WCONTINUED 57 # define __WIFCONTINUED(status) ((status) == __W_CONTINUED) 58 #endif 59 60 /* Nonzero if STATUS indicates the child dumped core. */ 61 #define __WCOREDUMP(status) ((status) & __WCOREFLAG) 62 63 /* Macros for constructing status values. */ 64 #define __W_EXITCODE(ret, sig) ((ret) << 8 | (sig)) 65 #define __W_STOPCODE(sig) ((sig) << 8 | 0x7f) 66 #define __W_CONTINUED 0xffff 67 #define __WCOREFLAG 0x80 68 69 70 #ifdef __USE_BSD 71 72 # include <endian.h> 73 74 union wait 75 { 76 int w_status; 77 struct 78 { 79 # if __BYTE_ORDER == __LITTLE_ENDIAN 80 unsigned int __w_termsig:7; /* Terminating signal. */ 81 unsigned int __w_coredump:1; /* Set if dumped core. */ 82 unsigned int __w_retcode:8; /* Return code if exited normally. */ 83 unsigned int:16; 84 # endif /* Little endian. */ 85 # if __BYTE_ORDER == __BIG_ENDIAN 86 unsigned int:16; 87 unsigned int __w_retcode:8; 88 unsigned int __w_coredump:1; 89 unsigned int __w_termsig:7; 90 # endif /* Big endian. */ 91 } __wait_terminated; 92 struct 93 { 94 # if __BYTE_ORDER == __LITTLE_ENDIAN 95 unsigned int __w_stopval:8; /* W_STOPPED if stopped. */ 96 unsigned int __w_stopsig:8; /* Stopping signal. */ 97 unsigned int:16; 98 # endif /* Little endian. */ 99 # if __BYTE_ORDER == __BIG_ENDIAN 100 unsigned int:16; 101 unsigned int __w_stopsig:8; /* Stopping signal. */ 102 unsigned int __w_stopval:8; /* W_STOPPED if stopped. */ 103 # endif /* Big endian. */ 104 } __wait_stopped; 105 }; 106 107 # define w_termsig __wait_terminated.__w_termsig 108 # define w_coredump __wait_terminated.__w_coredump 109 # define w_retcode __wait_terminated.__w_retcode 110 # define w_stopsig __wait_stopped.__w_stopsig 111 # define w_stopval __wait_stopped.__w_stopval 112 113 #endif /* Use BSD. */ 114