CS318 - Pintos
Pintos source browser for JHU CS318 course
read-zero.c
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1 /** Try a 0-byte read, which should return 0 without reading
2  anything. */
3 
4 #include <syscall.h>
5 #include "tests/lib.h"
6 #include "tests/main.h"
7 
8 void
9 test_main (void)
10 {
11  int handle, byte_cnt;
12  char buf;
13 
14  CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");
15 
16  buf = 123;
17  byte_cnt = read (handle, &buf, 0);
18  if (byte_cnt != 0)
19  fail ("read() returned %d instead of 0", byte_cnt);
20  else if (buf != 123)
21  fail ("0-byte read() modified buffer");
22 }
lib.h
test_main
void test_main(void)
Try a 0-byte read, which should return 0 without reading anything.
Definition: read-zero.c:9
buf
static char buf[BUF_SIZE]
Definition: child-syn-read.c:16
CHECK
#define CHECK(SUCCESS,...)
Takes an expression to test for SUCCESS and a message, which may include printf-style arguments.
Definition: lib.h:29
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
open
int open(const char *file)
Definition: syscall.c:103
fail
void fail(const char *format,...)
Definition: lib.c:40
main.h
read
int read(int fd, void *buffer, unsigned size)
Definition: syscall.c:115
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