remove deletes a name from the filesystem. It calls unlink for files, and rmdir for directories.
If the removed name was the last link to a file and no processes have the file open the file is deleted and the space it was using is made available for reuse.
If the name was the last link to a file but any processes still have the file open the file will remain in existence until the last file descriptor referring to it is closed.
If the name referred to a symbolic link the link is removed.
pathname points outside your accessible address space.
Write access to the directory containing pathname is not allowed for the process's effective uid, or one of the directories in pathname did not allow search (execute) permission.
The directory containing pathname has the sticky-bit (S_ISVTX) set and the process's effective uid is neither the uid of the file to be deleted nor that of the directory containing it.
pathname was too long.
A directory component in pathname does not exist or is a dangling symbolic link.
A component used as a directory in pathname is not, in fact, a directory.
Insufficient kernel memory was available.