pintos-doxygen/html/read-zero_8c_source.html

/** Try a 0-byte read, which should return 0 without reading

   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 = read (handle, &buf, 0);

  if (byte_cnt != 0)

    fail ("read() returned %d instead of 0", byte_cnt);

  else if (buf != 123)

    fail ("0-byte read() modified buffer");

}

byte_cnt
static size_t byte_cnt(size_t bit_cnt)
Returns the number of bytes required for BIT_CNT bits.
Definition: bitmap.c:58

buf
static char buf[BUF_SIZE]
Definition: child-syn-read.c:16

open
int open(const char *file)
Definition: syscall.c:103

read
int read(int fd, void *buffer, unsigned size)
Definition: syscall.c:115

fail
void fail(const char *format,...)
Definition: lib.c:40

lib.h

CHECK
#define CHECK(SUCCESS,...)
Takes an expression to test for SUCCESS and a message, which may include printf-style arguments.
Definition: lib.h:29

main.h

test_main
void test_main(void)
Try a 0-byte read, which should return 0 without reading anything.
Definition: read-zero.c:9