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Diffstat (limited to 'bits/waitstatus.h')
| -rw-r--r-- | bits/waitstatus.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/bits/waitstatus.h b/bits/waitstatus.h new file mode 100644 index 0000000..8e97f27 --- /dev/null +++ b/bits/waitstatus.h @@ -0,0 +1,104 @@ +/* Definitions of status bits for `wait' et al. + Copyright (C) 1992, 1994, 1996, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _SYS_WAIT_H +#error "Never use <bits/waitstatus.h> directly; include <sys/wait.h> instead." +#endif + + +/* Everything extant so far uses these same bits. */ + + +/* If WIFEXITED(STATUS), the low-order 8 bits of the status. */ +#define __WEXITSTATUS(status) (((status) & 0xff00) >> 8) + +/* If WIFSIGNALED(STATUS), the terminating signal. */ +#define __WTERMSIG(status) ((status) & 0x7f) + +/* If WIFSTOPPED(STATUS), the signal that stopped the child. */ +#define __WSTOPSIG(status) __WEXITSTATUS(status) + +/* Nonzero if STATUS indicates normal termination. */ +#define __WIFEXITED(status) (__WTERMSIG(status) == 0) + +/* Nonzero if STATUS indicates termination by a signal. */ +#ifdef __GNUC__ +#define __WIFSIGNALED(status) \ + (__extension__ ({ int __status = (status); \ + !__WIFSTOPPED(__status) && !__WIFEXITED(__status); })) +#else /* Not GCC. */ +#define __WIFSIGNALED(status) (!__WIFSTOPPED(status) && !__WIFEXITED(status)) +#endif /* GCC. */ + +/* Nonzero if STATUS indicates the child is stopped. */ +#define __WIFSTOPPED(status) (((status) & 0xff) == 0x7f) + +/* Nonzero if STATUS indicates the child dumped core. */ +#define __WCOREDUMP(status) ((status) & __WCOREFLAG) + +/* Macros for constructing status values. */ +#define __W_EXITCODE(ret, sig) ((ret) << 8 | (sig)) +#define __W_STOPCODE(sig) ((sig) << 8 | 0x7f) +#define __WCOREFLAG 0x80 + + +#ifdef __USE_BSD + +#include <endian.h> + +union wait + { + int w_status; + struct + { +#if __BYTE_ORDER == __LITTLE_ENDIAN + unsigned int __w_termsig:7; /* Terminating signal. */ + unsigned int __w_coredump:1; /* Set if dumped core. */ + unsigned int __w_retcode:8; /* Return code if exited normally. */ + unsigned int:16; +#endif /* Little endian. */ +#if __BYTE_ORDER == __BIG_ENDIAN + unsigned int:16; + unsigned int __w_retcode:8; + unsigned int __w_coredump:1; + unsigned int __w_termsig:7; +#endif /* Big endian. */ + } __wait_terminated; + struct + { +#if __BYTE_ORDER == __LITTLE_ENDIAN + unsigned int __w_stopval:8; /* W_STOPPED if stopped. */ + unsigned int __w_stopsig:8; /* Stopping signal. */ + unsigned int:16; +#endif /* Little endian. */ +#if __BYTE_ORDER == __BIG_ENDIAN + unsigned int:16; + unsigned int __w_stopsig:8; /* Stopping signal. */ + unsigned int __w_stopval:8; /* W_STOPPED if stopped. */ +#endif /* Big endian. */ + } __wait_stopped; + }; + +#define w_termsig __wait_terminated.__w_termsig +#define w_coredump __wait_terminated.__w_coredump +#define w_retcode __wait_terminated.__w_retcode +#define w_stopsig __wait_stopped.__w_stopsig +#define w_stopval __wait_stopped.__w_stopval + +#endif /* Use BSD. */ |