53 lines
1.5 KiB
C
Executable file
53 lines
1.5 KiB
C
Executable file
/* Child process for syn-rw.
|
|
Reads from a file created by our parent process, which is
|
|
growing it. We loop until we've read the whole file
|
|
successfully. Many iterations through the loop will return 0
|
|
bytes, because the file has not grown in the meantime. That
|
|
is, we are "busy waiting" for the file to grow.
|
|
(This test could be improved by adding a "yield" system call
|
|
and calling yield whenever we receive a 0-byte read.) */
|
|
|
|
#include <random.h>
|
|
#include <stdlib.h>
|
|
#include <syscall.h>
|
|
#include "tests/filesys/extended/syn-rw.h"
|
|
#include "tests/lib.h"
|
|
|
|
const char *test_name = "child-syn-rw";
|
|
|
|
static char buf1[BUF_SIZE];
|
|
static char buf2[BUF_SIZE];
|
|
|
|
int
|
|
main (int argc, const char *argv[])
|
|
{
|
|
int child_idx;
|
|
int fd;
|
|
size_t ofs;
|
|
|
|
quiet = true;
|
|
|
|
CHECK (argc == 2, "argc must be 2, actually %d", argc);
|
|
child_idx = atoi (argv[1]);
|
|
|
|
random_init (0);
|
|
random_bytes (buf1, sizeof buf1);
|
|
|
|
CHECK ((fd = open (file_name)) > 1, "open \"%s\"", file_name);
|
|
ofs = 0;
|
|
while (ofs < sizeof buf2)
|
|
{
|
|
int bytes_read = read (fd, buf2 + ofs, sizeof buf2 - ofs);
|
|
CHECK (bytes_read >= -1 && bytes_read <= (int) (sizeof buf2 - ofs),
|
|
"%zu-byte read on \"%s\" returned invalid value of %d",
|
|
sizeof buf2 - ofs, file_name, bytes_read);
|
|
if (bytes_read > 0)
|
|
{
|
|
compare_bytes (buf2 + ofs, buf1 + ofs, bytes_read, ofs, file_name);
|
|
ofs += bytes_read;
|
|
}
|
|
}
|
|
close (fd);
|
|
|
|
return child_idx;
|
|
}
|