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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#define FILENAME "test.dat"
int main()
{
off_t size;
int fd;
struct stat s;
uint32_t deadbeef = 0xdeadbeef;
uint32_t baadf00d = 0xbaadf00d;
char buf[4096];
int i;
int rc;
printf("Verifying that lseek() doesn't change the file size\n");
unlink(FILENAME);
fd = open(FILENAME, (O_CREAT | O_EXCL| O_WRONLY));
if (fd == -1) {
printf("Error attempting to create new file [%s]\n", FILENAME);
rc = 1;
goto out;
}
size = lseek(fd, 4096, SEEK_END);
if (size != 4096) {
printf("Expected 4096 from lseek; got [%lld]\n", size);
rc = 1;
goto out;
}
close(fd);
rc = stat(FILENAME, &s);
if (rc == -1) {
printf("Error attempting to stat file [%s]\n", FILENAME);
rc = 1;
goto out;
}
if (s.st_size != 0) {
printf("Filesize is [%lld]; expected 0\n", s.st_size);
rc = 1;
goto out;
}
unlink(FILENAME);
printf("Verifying that intermediate regions of the file are "
"initialized to 0 on lseek() and write() events\n");
fd = open(FILENAME, (O_CREAT | O_EXCL| O_RDWR), S_IRWXU);
if (fd == -1) {
printf("Error attempting to create new file [%s]\n", FILENAME);
rc = 1;
goto out;
}
if ((size = lseek(fd, 4096, SEEK_END)) != 4096) {
printf("Expected 4096 from lseek; got [%lld]\n", size);
rc = 1;
goto out;
}
if ((size = write(fd, (char *)&deadbeef, 4)) != 4) {
printf("Expected a write of 4 bytes; got [%lld] instead\n",
size);
rc = 1;
goto out;
}
if ((size = lseek(fd, 5120, SEEK_SET)) != 5120) {
printf("Expected 5120 from lseek; got [%lld]\n", size);
rc = 1;
goto out;
}
if ((size = write(fd, (char *)&baadf00d, 4)) != 4) {
printf("Expected a write of 4 bytes; got [%lld] instead\n",
size);
rc = 1;
goto out;
}
if ((size = lseek(fd, 4096, SEEK_SET)) != 4096) {
printf("Expected 4096 from lseek; got [%lld]\n", size);
rc = 1;
goto out;
}
if ((size = read(fd, buf, 4)) != 4) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 4, size);
rc = 1;
goto out;
}
if (memcmp((char *)&deadbeef, buf, 4) != 0) {
printf("deadbeef data mismatch on initial write\n");
rc = 1;
goto out;
}
if ((size = read(fd, buf, 1020)) != 1020) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 1020, size);
rc = 1;
goto out;
}
for (i = 0; i < 1020; i++)
if (buf[i] != 0x00) {
printf("Byte [%d] is [0x%.2x]; expected [0x00]\n", i,
buf[i]);
rc = 1;
goto out;
}
if ((size = read(fd, buf, 4)) != 4) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 4, size);
rc = 1;
goto out;
}
if (memcmp((char *)&baadf00d, buf, 4) != 0) {
printf("baadf00d data mismatch on initial write\n");
rc = 1;
goto out;
}
if ((size = read(fd, buf, 1)) != 0) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 0, size);
rc = 1;
goto out;
}
if ((size = lseek(fd, 0, SEEK_SET)) != 0) {
printf("Expected 0 from lseek; got [%lld]\n", size);
rc = 1;
goto out;
}
if ((size = read(fd, buf, 4096)) != 4096) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 4096, size);
rc = 1;
goto out;
}
for (i = 0; i < 4096; i++)
if (buf[i] != 0x00) {
printf("Byte [%d] is [0x%.2x]; expected [0x00]\n", i,
buf[i]);
rc = 1;
goto out;
}
close(fd);
rc = stat(FILENAME, &s);
if (rc == -1) {
printf("Error attempting to stat file [%s]\n", FILENAME);
rc = 1;
goto out;
}
if (s.st_size != 5124) {
printf("Filesize is [%lld]; expected 5124\n", s.st_size);
rc = 1;
goto out;
}
fd = open(FILENAME, (O_RDONLY));
if (fd == -1) {
printf("Error attempting to create new file [%s]\n", FILENAME);
rc = 1;
goto out;
}
if ((size = read(fd, buf, 4096)) != 4096) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 4096, size);
rc = 1;
goto out;
}
for (i = 0; i < 4096; i++)
if (buf[i] != 0x00) {
printf("Byte [%d] is [0x%.2x]; expected [0x00]\n", i,
buf[i]);
rc = 1;
goto out;
}
if ((size = read(fd, buf, 4)) != 4) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 4, size);
rc = 1;
goto out;
}
if (memcmp((char *)&deadbeef, buf, 4) != 0) {
printf("deadbeef data mismatch after initial write\n");
rc = 1;
goto out;
}
if ((size = read(fd, buf, 1020)) != 1020) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 1020, size);
rc = 1;
goto out;
}
for (i = 0; i < 1020; i++)
if (buf[i] != 0x00) {
printf("Byte [%d] is [0x%.2x]; expected [0x00]\n", i,
buf[i]);
rc = 1;
goto out;
}
if ((size = read(fd, buf, 4)) != 4) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 4, size);
rc = 1;
goto out;
}
if (memcmp((char *)&baadf00d, buf, 4) != 0) {
printf("baadf00d data mismatch after initial write\n");
rc = 1;
goto out;
}
if ((size = read(fd, buf, 1)) != 0) {
printf("Error attempting to read data. Expected [%lld] bytes; "
"read [%lld] instead\n", 0, size);
rc = 1;
goto out;
}
close(fd);
unlink(FILENAME);
rc = 0;
out:
return rc;
}
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