1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#define TEST_FILE "fdopen.tmp"
int main() {
int fd = open(TEST_FILE, O_CREAT | O_RDWR, 0666);
assert(fd >= 0);
char *str = "mlibc fdopen test";
assert(write(fd, str, strlen(str)));
// Seek to the beginning, then reopen with fdopen in append mode.
lseek(fd, 0, SEEK_SET);
FILE *file = fdopen(fd, "a");
assert(file);
// Append and close.
str = " appended";
fwrite(str, strlen(str), 1, file);
fflush(file);
fclose(file);
// Open it again and check that the append succeeded.
fd = open(TEST_FILE, O_RDONLY);
assert(fd >= 0);
file = fdopen(fd, "r");
assert(file);
str = "mlibc fdopen test appended";
char buf[100] = {0};
assert(fread(buf, 1, strlen(str), file));
assert(!strcmp(buf, str));
fclose(file);
}
|
