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/* ==== test_execve.c ============================================================
* Copyright (c) 1994 by Chris Provenzano, proven@athena.mit.edu
*
* Description : Test execve() and dup2() calls.
*
* 1.00 94/04/29 proven
* -Started coding this file.
*/
#include <pthread.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include "test.h"
extern char **environ;
char *argv[] = {
"/bin/echo",
"This line should appear after the execve",
NULL
};
char * should_succeed = "This line should be displayed\n";
char * should_fail = "Error: This line should NOT be displayed\n";
int
main()
{
int fd;
printf("This is the first message\n");
if (isatty(1)) {
char *ttynm;
CHECKn(ttynm = ttyname(1));
printf("tty is %s\n", ttynm);
CHECKe(fd = open(ttynm, O_RDWR));
} else
PANIC("stdout not a tty");
CHECKn(printf("This output is necessary to set the stdout fd to NONBLOCKING\n"));
/* do a dup2 */
CHECKe(dup2(fd, 1));
CHECKe(write(1, should_succeed, (size_t)strlen(should_succeed)));
CHECKe(execve(argv[0], argv, environ));
DIE(errno, "execve %s", argv[0]);
}
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