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#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int main() {
const char* target = "./input.txt";
const char* linkpath = "/sandbox/subdir/test_link";
char readlink_result[128];
size_t result_size = sizeof(readlink_result);
assert(0 == symlink(target, linkpath));
assert(readlink(linkpath, readlink_result, result_size) ==
strlen(target) + 1);
assert(0 == strcmp(readlink_result, target));
FILE* file = fopen(linkpath, "r");
assert(file != NULL);
int c = fgetc(file);
while (c != EOF) {
int wrote = fputc(c, stdout);
assert(wrote != EOF);
c = fgetc(file);
}
}