sem_post.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_post */
#include	"unpipc.h"
#include	"semaphore.h"

int
mysem_post(mysem_t *sem)
{
	char	c;

	if (sem->sem_magic != SEM_MAGIC) {
		errno = EINVAL;
		return(-1);
	}

	if (write(sem->sem_fd[1], &c, 1) == 1)
		return(0);
	return(-1);
}
/* end sem_post */

void
Mysem_post(mysem_t *sem)
{
	if (mysem_post(sem) == -1)
		err_sys("mysem_post error");
}