Opening broken symlink with O_CREAT returns EEXIST unlike linux

[hoodmane]

The source code:

#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>


char* join_path(const char* path1, const char* path2) {
    int len1 = strlen(path1);
    int len2 = strlen(path2);
    char* result = malloc(len1 + len2 + 2);
    memcpy(result, path1, len1);
    result[len1] = '/';
    memcpy(result + len1 + 1, path2, len2);
    return result;
}

int main() {
    char template[] = "/tmp/tmpdir.XXXXXX";
    char *tmpdir = mkdtemp(template);
    char* p1 = join_path(tmpdir, "test");
    char* p2 = join_path(tmpdir, "test2");

    int res = symlink(p2, p1);
    printf("link result: %d\n", res);
    res = open(p1, O_CREAT);
    printf("open result: %d, errno: %d %s\n", res, errno, strerror(errno));
    free(p1);
    free(p2);
}

Run it:

$ gcc broken_symlink.c && ./a.out
link result: 0
open result: 3, errno: 0 Success
$ emcc broken_symlink.c && node a.out.js 
link result: 0
open result: -1, errno: 20 File exists