static ssize_t uv__fs_readlink(uv_fs_t* req) {
ssize_t len;
char* buf;
len = uv__fs_pathmax_size(req->path);
buf = uv__malloc(len + 1);
if (buf == NULL) {
errno = ENOMEM;
return -1;
}
#if defined(__MVS__)
len = os390_readlink(req->path, buf, len);
#else
len = readlink(req->path, buf, len);
#endif
if (len == -1) {
uv__free(buf);
return -1;
}
buf[len] = '\0';
req->ptr = buf;
return 0;
}
static ssize_t uv__fs_readlink(uv_fs_t* req) {
ssize_t maxlen;
ssize_t len;
char* buf;
char* newbuf;
#if defined(UV__FS_PATH_MAX_FALLBACK)
/* We may not have a real PATH_MAX. Read size of link. */
struct stat st;
int ret;
ret = lstat(req->path, &st);
if (ret != 0)
return -1;
if (!S_ISLNK(st.st_mode)) {
errno = EINVAL;
return -1;
}
maxlen = st.st_size;
/* According to readlink(2) lstat can report st_size == 0
for some symlinks, such as those in /proc or /sys. */
if (maxlen == 0)
maxlen = uv__fs_pathmax_size(req->path);
#else
maxlen = uv__fs_pathmax_size(req->path);
#endif
buf = uv__malloc(maxlen);
if (buf == NULL) {
errno = ENOMEM;
return -1;
}
#if defined(__MVS__)
len = os390_readlink(req->path, buf, maxlen);
#else
len = readlink(req->path, buf, maxlen);
#endif
if (len == -1) {
uv__free(buf);
return -1;
}
/* Uncommon case: resize to make room for the trailing nul byte. */
if (len == maxlen) {
newbuf = uv__realloc(buf, len + 1);
if (newbuf == NULL) {
uv__free(buf);
return -1;
}
buf = newbuf;
}
buf[len] = '\0';
req->ptr = buf;
return 0;
}