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musl/include/sys/sem.h

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initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#ifndef _SYS_SEM_H
#define _SYS_SEM_H
#ifdef __cplusplus
extern "C" {
#endif
default features: make musl usable without feature test macros the old behavior of exposing nothing except plain ISO C can be obtained by defining __STRICT_ANSI__ or using a compiler option (such as -std=c99) that predefines it. the new default featureset is POSIX with XSI plus _BSD_SOURCE. any explicit feature test macros will inhibit the default. installation docs have also been updated to reflect this change.
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#include <features.h>
initial check-in, version 0.5.0
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#define __NEED_size_t
type exposure fixes in sys/sem.h
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#define __NEED_pid_t
#define __NEED_time_t
#ifdef _GNU_SOURCE
#define __NEED_struct_timespec
#endif
initial check-in, version 0.5.0
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#include <bits/alltypes.h>
#include <sys/ipc.h>
#define SEM_UNDO 0x1000
#define GETPID 11
#define GETVAL 12
#define GETALL 13
#define GETNCNT 14
#define GETZCNT 15
#define SETVAL 16
#define SETALL 17
work around wrong kernel type for sem_nsems member of struct semid_ds rejecting invalid values for n is fine even in the case where a new sem will not be created, since the kernel does its range checks on n even in this case as well. by default, the kernel will bound the limit well below USHRT_MAX anyway, but it's presumably possible that an administrator could override this limit and break things.
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#include <endian.h>
initial check-in, version 0.5.0
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struct semid_ds {
struct ipc_perm sem_perm;
sys/sem.h: cheat and make all longs use time_t instead most of the members should be time_t anyway, and time_t has the correct semantics for "syscall_long", so it works on all archs, even x32.
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time_t sem_otime;
time_t __unused1;
time_t sem_ctime;
time_t __unused2;
work around wrong kernel type for sem_nsems member of struct semid_ds rejecting invalid values for n is fine even in the case where a new sem will not be created, since the kernel does its range checks on n even in this case as well. by default, the kernel will bound the limit well below USHRT_MAX anyway, but it's presumably possible that an administrator could override this limit and break things.
2013-06-29 03:57:58 +00:00
#if __BYTE_ORDER == __LITTLE_ENDIAN
unsigned short sem_nsems;
sys/sem.h: cheat and make all longs use time_t instead most of the members should be time_t anyway, and time_t has the correct semantics for "syscall_long", so it works on all archs, even x32.
2014-01-07 23:04:29 +00:00
char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
work around wrong kernel type for sem_nsems member of struct semid_ds rejecting invalid values for n is fine even in the case where a new sem will not be created, since the kernel does its range checks on n even in this case as well. by default, the kernel will bound the limit well below USHRT_MAX anyway, but it's presumably possible that an administrator could override this limit and break things.
2013-06-29 03:57:58 +00:00
#else
sys/sem.h: cheat and make all longs use time_t instead most of the members should be time_t anyway, and time_t has the correct semantics for "syscall_long", so it works on all archs, even x32.
2014-01-07 23:04:29 +00:00
char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
work around wrong kernel type for sem_nsems member of struct semid_ds rejecting invalid values for n is fine even in the case where a new sem will not be created, since the kernel does its range checks on n even in this case as well. by default, the kernel will bound the limit well below USHRT_MAX anyway, but it's presumably possible that an administrator could override this limit and break things.
2013-06-29 03:57:58 +00:00
unsigned short sem_nsems;
#endif
sys/sem.h: cheat and make all longs use time_t instead most of the members should be time_t anyway, and time_t has the correct semantics for "syscall_long", so it works on all archs, even x32.
2014-01-07 23:04:29 +00:00
time_t __unused3;
time_t __unused4;
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
};
#define _SEM_SEMUN_UNDEFINED 1
#define SEM_STAT 18
#define SEM_INFO 19
struct seminfo {
int semmap;
int semmni;
int semmns;
int semmnu;
int semmsl;
int semopm;
int semume;
int semusz;
int semvmx;
int semaem;
};
struct sembuf {
unsigned short sem_num;
short sem_op;
short sem_flg;
};
int semctl(int, int, int, ...);
int semget(key_t, int, int);
int semop(int, struct sembuf *, size_t);
#ifdef _GNU_SOURCE
int semtimedop(int, struct sembuf *, size_t, const struct timespec *);
#endif
#ifdef __cplusplus
}
#endif
#endif