exec1.c

unix高级编程源代码.<<unix高级编程>>

#include	<sys/types.h>
#include	<sys/wait.h>
#include	"ourhdr.h"

char	*env_init[] = { "USER=unknown", "PATH=/tmp", NULL };

int
main(void)
{
	pid_t	pid;

	if ( (pid = fork()) < 0)
		err_sys("fork error");
	else if (pid == 0) {	/* specify pathname, specify environment */
		if (execle("/home/stevens/bin/echoall",
				   "echoall", "myarg1", "MY ARG2", (char *) 0,
				   env_init) < 0)
			err_sys("execle error");
	}
	if (waitpid(pid, NULL, 0) < 0)
		err_sys("wait error");

	if ( (pid = fork()) < 0)
		err_sys("fork error");
	else if (pid == 0) {	/* specify filename, inherit environment */
		if (execlp("echoall",
				   "echoall", "only 1 arg", (char *) 0) < 0)
			err_sys("execlp error");
	}
	exit(0);
}