unpv13e/server/child05.c

/* include child_make */
#include	"unp.h"
#include	"child.h"

pid_t
child_make(int i, int listenfd, int addrlen)
{
	int		sockfd[2];
	pid_t	pid;
	void	child_main(int, int, int);

	Socketpair(AF_LOCAL, SOCK_STREAM, 0, sockfd);

	if ( (pid = Fork()) > 0) {
		Close(sockfd[1]);
		cptr[i].child_pid = pid;
		cptr[i].child_pipefd = sockfd[0];
		cptr[i].child_status = 0;
		return(pid);		/* parent */
	}

	Dup2(sockfd[1], STDERR_FILENO);		/* child's stream pipe to parent */
	Close(sockfd[0]);
	Close(sockfd[1]);
	Close(listenfd);					/* child does not need this open */
	child_main(i, listenfd, addrlen);	/* never returns */
}
/* end child_make */

/* include child_main */
void
child_main(int i, int listenfd, int addrlen)
{
	char			c;
	int				connfd;
	ssize_t			n;
	void			web_child(int);

	printf("child %ld starting\n", (long) getpid());
	for ( ; ; ) {
		if ( (n = Read_fd(STDERR_FILENO, &c, 1, &connfd)) == 0)
			err_quit("read_fd returned 0");
		if (connfd < 0)
			err_quit("no descriptor from read_fd");

		web_child(connfd);				/* process request */
		Close(connfd);

		Write(STDERR_FILENO, "", 1);	/* tell parent we're ready again */
	}
}
/* end child_main */