freebsd-dev/lib/libc/gen/semctl.c

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#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include <stdlib.h>
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#if __STDC__
int semctl(int semid, int semnum, int cmd, ...)
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#else
int semctl(semid, semnum, cmd, va_alist)
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int semid, semnum;
int cmd;
va_dcl
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#endif
{
va_list ap;
union semun semun;
union semun *semun_ptr;
#if __STDC__
va_start(ap, cmd);
#else
va_start(ap);
#endif
if (cmd == IPC_SET || cmd == IPC_STAT || cmd == GETALL
|| cmd == SETVAL || cmd == SETALL) {
semun = va_arg(ap, union semun);
semun_ptr = &semun;
} else {
semun_ptr = NULL;
}
va_end(ap);
#ifdef __NETBSD_SYSCALLS
return (__semctl(semid, semnum, cmd, semun_ptr));
#else
return (semsys(0, semid, semnum, cmd, semun_ptr));
#endif
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}