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