usr.bin/rdist/child.c

1 /*	$OpenBSD: child.c,v 1.28 2022/12/26 19:16:02 jmc Exp $	*/
54  * Structure for child rdist processes mainted by the parent
57 	char	       *c_name;			/* Name of child */
78  * Remove a child that has died (exited)
82 removechild(CHILD *child)
87 		 child->c_name, child->c_pid, child->c_readfd);
90 	 * Find the child in the list
94 		if (pc == child)
98 		error("RemoveChild called with bad child %s %d %d",
99 		      child->c_name, child->c_pid, child->c_readfd);
102 		 * Remove the child
117 		(void) free(child->c_name);
119 		(void) close(child->c_readfd);
127  * Create a totally new copy of a child.
130 copychild(CHILD *child)
136 	newc->c_name = xstrdup(child->c_name);
137 	newc->c_readfd = child->c_readfd;
138 	newc->c_pid = child->c_pid;
139 	newc->c_state = child->c_state;
146  * Add a child to the list of children.
149 addchild(CHILD *child)
155 	pc = copychild(child);
163 		 child->c_name, child->c_pid, child->c_readfd, activechildren);
167  * Read input from a child process.
170 readchild(CHILD *child)
176 		 child->c_name, child->c_pid, child->c_readfd);
179 	 * Check that this is a valid child.
181 	if (child->c_name == NULL || child->c_readfd <= 0) {
182 		debugmsg(DM_MISC, "[readchild(%s, %d, %d) bad child]",
183 			 child->c_name, child->c_pid, child->c_readfd);
188 	 * Read from child and display the result.
190 	while ((amt = read(child->c_readfd, rbuf, sizeof(rbuf))) > 0) {
193 			 child->c_name, child->c_pid, child->c_readfd, amt);
198 			 child->c_name, child->c_pid, child->c_readfd);
202 		 child->c_name, child->c_pid, child->c_readfd, amt, errno);
209 			 child->c_name, child->c_pid, child->c_readfd);
250  * input and then remove the child from the list of children.
263 	 * Reap every child that has exited.  Break out of the
277 		 * See if a child really exited
308  * Scan the children list to find the child that just exited,
400 	 * Go through the list of children and read from each child
405 		 * Make sure child still exists
444  * Spawn (create) a new child process for "cmd".
460 		error("Cannot spawn child for %s: fork failed: %s",
469 		/* Receive notification when the child exits */
472 		/* Setup the new child */
479 		/* We're not going to write to the child */
488 		/* Add new child to child list */
495 			 "spawn() Forked child %d for host %s active = %d\n",