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#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/mman.h>
#include <arpa/inet.h>
#include <inttypes.h>
#define TEST_WORDS (1024*1024)
int main(void)
{
FILE *f;
int i, n;
uint32_t *buf1, *buf2, *p;
printf("Hello, World!\nHello again");
printf(" - and some more - ");
printf("and some more\n");
buf1 = mmap(NULL, 2*4*TEST_WORDS, PROT_READ|PROT_WRITE,
MAP_ANONYMOUS|MAP_PRIVATE, 0, 0);
if (buf1 == MAP_FAILED) {
perror("mmap");
return 1;
}
buf2 = buf1 + TEST_WORDS;
p = buf1;
for (i = 0; i < TEST_WORDS; i++)
*p++ = htonl(i);
f = fopen("test.out", "w+b");
if (!f) {
perror("fopen");
return 1;
}
for (i = 2; i < TEST_WORDS; i += (i >> 1)) {
n = fwrite(buf1, 4, i, f);
if (n != i) {
perror("fwrite");
return 1;
}
}
fprintf(f, "Writing to the file...\n");
fprintf(f, "Writing to the file ");
fprintf(f, "some more\n");
fseek(f, 0, SEEK_SET);
for (i = 2; i < TEST_WORDS; i += (i >> 1)) {
n = fread(buf2, 4, i, f);
if (n != i) {
perror("fread");
return 1;
}
if (memcmp(buf1, buf2, i*4)) {
fprintf(stderr, "memory mismatch error, i = %d\n", i);
return 1;
}
}
fclose(f);
return 0;
}
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