initsrv1.c

unix环境高级编程第二版配套源代码 unix环境高级编程第二版配套源代码

#include "apue.h"
#include <errno.h>
#include <sys/socket.h>

int
initserver(int type, const struct sockaddr *addr, socklen_t alen,
  int qlen)
{
	int fd;
	int err = 0;

	if ((fd = socket(addr->sa_family, type, 0)) < 0)
		return(-1);
	if (bind(fd, addr, alen) < 0) {
		err = errno;
		goto errout;
	}
	if (type == SOCK_STREAM || type == SOCK_SEQPACKET) {
		if (listen(fd, qlen) < 0) {
			err = errno;
			goto errout;
		}
	}
	return(fd);

errout:
	close(fd);
	errno = err;
	return(-1);
}