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OS/pintos-env/pintos/tests/userprog/write-zero.c

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/* Try a 0-byte write, which should return 0 without writing
anything. */
#include <syscall.h>
#include "tests/lib.h"
#include "tests/main.h"
void
test_main (void)
{
int handle, byte_cnt;
char buf;
CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");
buf = 123;
byte_cnt = write (handle, &buf, 0);
if (byte_cnt != 0)
fail("write() returned %d instead of 0", byte_cnt);
}