minix/test/test54.c

64 lines
1.1 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <err.h>
#include <stdlib.h>
int main(void)
{
int fd;
char *wbuf, *rbuf;
off_t off=0;
size_t size;
ssize_t nwritten;
ssize_t nread;
char *filename;
int i;
printf("Test 54 ");
fflush(stdout);
if((filename = mktemp("/tmp/pwrite_test_XXXXXXX")) == NULL) {
err(1, "Failed to create tempfile");
}
if((fd = open(filename, O_CREAT|O_RDWR)) < 0) {
err(1, "Failed to open %s", filename);
}
size = 1 + rand() % 4096;
off = rand();
if((wbuf = malloc(sizeof(char)*size)) == NULL) {
errx(1, "Malloc failed.\n");
}
for(i = 0; i < size; i++) {
wbuf[i] = 1 + rand()%127;
}
if((nwritten = pwrite(fd, wbuf, size, off)) < 0) {
err(1, "pwrite failed");
}
if((rbuf = malloc(sizeof(char)*nwritten)) == NULL) {
errx(1, "Malloc failed.\n");
}
if((nread = pread(fd, rbuf, nwritten, off)) < 0) {
err(1, "pread failed");
}
if(strncmp(rbuf, wbuf, nread) != 0) {
err(1, "Test failed.\n");
}
printf("ok\n");
close(fd);
free(wbuf);
return 0;
}