sem_unlink.c

这是unix网络编程一书的源代码希望能对大家的学习提供一种便利

/* include sem_unlink */
#include	"unpipc.h"
#include	"semaphore.h"

int
mysem_unlink(const char *pathname)
{
	int		semid;
	key_t	key;

	if ( (key = ftok(pathname, 0)) == (key_t) -1)
		return(-1);
	if (unlink(pathname) == -1)
		return(-1);
	if ( (semid = semget(key, 1, SVSEM_MODE)) == -1)
		return(-1);
	if (semctl(semid, 0, IPC_RMID) == -1)
		return(-1);
	return(0);
}
/* end sem_unlink */

void
Mysem_unlink(const char *pathname)
{
	if (mysem_unlink(pathname) == -1)
		err_sys("mysem_unlink error");
}