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/*
#notarget: cris*-*-elf
#output: got: a\nthen: bc\nexit: 0\n
*/
/* This is a very limited subset of what ex1.c does; we just check that
thread creation (clone syscall) and pipe writes and reads work. */
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
int pip[2];
int
process (void *arg)
{
char *s = arg;
if (write (pip[1], s+2, 1) != 1) abort ();
if (write (pip[1], s+1, 1) != 1) abort ();
if (write (pip[1], s, 1) != 1) abort ();
return 0;
}
int
main (void)
{
int retcode;
int pid;
int st;
long stack[16384];
char buf[10] = {0};
retcode = pipe (pip);
if (retcode != 0)
{
fprintf (stderr, "Bad pipe %d\n", retcode);
abort ();
}
pid = clone (process, (char *) stack + sizeof (stack) - 64,
(CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
| SIGCHLD, "cba");
if (pid <= 0)
{
fprintf (stderr, "Bad clone %d\n", pid);
abort ();
}
if ((retcode = read (pip[0], buf, 1)) != 1)
{
fprintf (stderr, "Bad read 1: %d\n", retcode);
abort ();
}
printf ("got: %c\n", buf[0]);
retcode = read (pip[0], buf, 2);
if (retcode == 1)
{
retcode = read (pip[0], buf+1, 1);
if (retcode != 1)
{
fprintf (stderr, "Bad read 1.5: %d\n", retcode);
abort ();
}
retcode = 2;
}
if (retcode != 2)
{
fprintf (stderr, "Bad read 2: %d\n", retcode);
abort ();
}
printf ("then: %s\n", buf);
retcode = wait4 (-1, &st, WNOHANG | __WCLONE, NULL);
if (retcode != pid || !WIFEXITED (st))
{
fprintf (stderr, "Bad wait %d %x\n", retcode, st);
abort ();
}
printf ("exit: %d\n", WEXITSTATUS (st));
return 0;
}
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