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/* 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;
}
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