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#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
static char data[] = {
'a', 'b', 'c', '\0',
'\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0',
'\0', '\0', '\0', '\0'
};
#define DATA_SIZE 16
int main(int argc, char *argv[])
{
int fd;
struct stat *fstat;
char *filename;
ssize_t size;
#define BUF_SIZE 32
char buf[BUF_SIZE];
int i;
int no_open = 0;
int data_size;
int rc = 0;
if (argc < 2) {
printf("Usage: test_truncate_no_open <path>\n");
return 1;
}
if (argc == 3)
no_open = 1;
filename = argv[1];
printf("Test filename: [%s]\n", filename);
if (!no_open) {
unlink(filename);
if ((fd = open(filename, (O_WRONLY | O_CREAT | O_EXCL),
(S_IRUSR | S_IWUSR))) == -1) {
printf("Error attempting to create empty file [%s]\n",
filename);
rc = 1;
goto out;
}
size = write(fd , "abc" , 3);
if (size < 0) {
printf("data not written to file");
rc = 1;
goto out;
}
close(fd);
fstat = malloc(sizeof(struct stat));
if (!fstat) {
printf("Unable to allocate memory\n");
rc = 1;
goto out;
}
stat(filename, fstat);
if (fstat->st_size != 3) {
printf("test file should be 3 bytes\n");
printf("test file is [%d] bytes\n", fstat->st_size);
free(fstat);
if (unlink(filename)) {
printf("error deleting file\n");
rc = 1;
goto out;
}
rc = 1;
goto out;
}
free(fstat);
}
if (no_open)
data_size = DATA_SIZE * 2;
else
data_size = DATA_SIZE;
if ((rc = truncate(filename, data_size)) == -1) {
printf("Error attempting to truncate [%s] to [%d] bytes\n",
filename, data_size);
rc = 1;
goto out;
}
rc = 0;
fstat = malloc(sizeof(struct stat));
if (!fstat) {
printf("Unable to allocate memory\n");
rc = 1;
goto out;
}
stat(filename, fstat);
if (fstat->st_size != data_size) {
printf("test file should be [%d] bytes\n", data_size);
printf("test file is [%d] bytes\n", fstat->st_size);
free(fstat);
if (unlink(filename)) {
printf("error deleting file\n");
rc = 1;
goto out;
}
rc = 1;
goto out;
}
free(fstat);
if ((fd = open(filename, O_RDONLY)) == -1) {
printf("Error attempting to open file [%s]\n", filename);
rc = 1;
goto out;
}
size = read(fd, buf, BUF_SIZE);
if (size != data_size) {
printf("expected to read [%d] bytes; read [%d] bytes instead\n",
data_size, size);
rc = 1;
goto out;
}
close(fd);
for (i = 0; i < data_size; i++)
if (buf[i] != data[i]) {
printf("Data at offset [%d] does not match. Expected "
"data = [0x%.2x]; read data = [0x%.2x]\n", i,
data[i], buf[i]);
rc = 1;
goto out;
}
out:
if (rc)
printf("truncate_no_open test failed; rc = [%d]\n", rc);
else
printf("truncate_no_open test succeeded\n");
return rc;
}
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