First commit

libexec/common.c

@@ -0,0 +1,57 @@
+#include "config.h"
+
+int len(const char *msg)
+{
+	char *p;
+	for (p = (char *)msg; *p; ++p)
+		;
+	return p - msg;
+}
+
+void log(const char *msg)
+{
+	write(1, "=> ", 4);
+	write(1, msg, len(msg));
+	write(1, "\n", 1);
+}
+
+void runprgs(struct cmd *cmds, int n)
+{
+	int tty, i;
+	tty = open(LOGTO, O_WRONLY);
+	close(1);
+	close(2);
+	dup2(tty, 1);
+	dup2(tty, 2);
+
+	for (i = 0; i < n; i++)
+	{
+		int pid;
+
+		if (cmds[i].flags == RESPAWN)
+		{
+			if (fork())
+				goto end;
+		}
+
+	loop:
+		pid = fork();
+
+		if (!pid)
+		{
+			execve(cmds[i].args[0], cmds[i].args, NULL);
+			exit(1);
+		}
+
+		switch (cmds[i].flags)
+		{
+		case RESPAWN:
+			waitpid(pid, NULL, 0);
+			sleep(1);
+			goto loop;
+		case WAIT:
+			wait4(pid, NULL, 0, NULL);
+		}
+	end:;
+	}
+}