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int unlink(const char *path);
path: [in] points to the path of the file to unlink.
Deletes a link to a file. If the file is not used and it was the last link, the file is also deleted.
On success, returns zero. On error, returns -1 and sets errno to
one of the following value:
EPERM: the directory has the stiky bit on but the calling
taks uid does not match the file uid or the directory uid.
EFAULT, EACCESS, ENAMETOOLONG, ENOENT,
ENOTDIR, EISDIR, ENOMEM, EROFS.
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