mirror of
https://git.musl-libc.org/git/musl
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ea3b40a321
the result of the 0xffff mask with the exit status could have bit 15 set, in which case multiplying by 0x10001 overflows 32-bit signed int. making the multiply unsigned avoids the overflow. it also changes the sign extension behavior of the subsequent >> operation, but the affected bits are all unwanted anyway and all discarded by the cast to short.
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
#ifndef _SYS_WAIT_H
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#define _SYS_WAIT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <features.h>
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#define __NEED_pid_t
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#define __NEED_id_t
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#include <bits/alltypes.h>
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typedef enum {
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P_ALL = 0,
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P_PID = 1,
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P_PGID = 2,
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P_PIDFD = 3
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} idtype_t;
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pid_t wait (int *);
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pid_t waitpid (pid_t, int *, int );
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#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
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|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
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|| defined(_BSD_SOURCE)
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#include <signal.h>
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int waitid (idtype_t, id_t, siginfo_t *, int);
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#endif
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#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
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#include <sys/resource.h>
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pid_t wait3 (int *, int, struct rusage *);
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pid_t wait4 (pid_t, int *, int, struct rusage *);
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#endif
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#define WNOHANG 1
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#define WUNTRACED 2
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#define WSTOPPED 2
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#define WEXITED 4
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#define WCONTINUED 8
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#define WNOWAIT 0x1000000
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#define __WNOTHREAD 0x20000000
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#define __WALL 0x40000000
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#define __WCLONE 0x80000000
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#define WEXITSTATUS(s) (((s) & 0xff00) >> 8)
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#define WTERMSIG(s) ((s) & 0x7f)
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#define WSTOPSIG(s) WEXITSTATUS(s)
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#define WCOREDUMP(s) ((s) & 0x80)
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#define WIFEXITED(s) (!WTERMSIG(s))
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#define WIFSTOPPED(s) ((short)((((s)&0xffff)*0x10001U)>>8) > 0x7f00)
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#define WIFSIGNALED(s) (((s)&0xffff)-1U < 0xffu)
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#define WIFCONTINUED(s) ((s) == 0xffff)
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#if _REDIR_TIME64
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#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
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__REDIR(wait3, __wait3_time64);
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__REDIR(wait4, __wait4_time64);
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#endif
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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