libposix: POSIX_rmdir

sys/include/posix.h

@@ -1,7 +1,7 @@
 /*
  * This file is part of Jehanne.
  *
- * Copyright (C) 2017-2018 Giacomo Tesio <giacomo@tesio.it>
+ * Copyright (C) 2017-2019 Giacomo Tesio <giacomo@tesio.it>
  *
  * This is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -324,6 +324,7 @@ extern int POSIX_pipe(int *errnop, int fildes[2]);
 extern int POSIX_umask(int *errnop, int mask);
 extern int POSIX_fcntl(int *errnop, int fd, PosixFDCmds cmd, uintptr_t arg);
 extern long POSIX_sysconf(int *errnop, PosixSysConfNames name);
+extern int POSIX_rmdir(int *errnop, const char *name);
 
 extern int POSIX_sigaddset(int *errnop, PosixSignalMask *set, int signo);
 extern int POSIX_sigdelset(int *errnop, PosixSignalMask *set, int signo);

sys/src/lib/posix/files.c

@@ -543,6 +543,35 @@ POSIX_unlink(int *errnop, const char *name)
 	return -1;
 }
 
+int
+POSIX_rmdir(int *errnop, const char *name)
+{
+	Dir *db;
+	long ret;
+	if(name == nil || name[0] == 0){
+		*errnop = __libposix_get_errno(PosixENOENT);
+		return -1;
+	}
+	ret = sys_remove(name);
+	switch(ret){
+	case 0:
+		return 0;
+	case ~0:
+		db = nil;
+		if((db=dirstat(name))!=nil && (db->qid.type&QTDIR)){
+			*errnop = __libposix_translate_errstr((uintptr_t)POSIX_rmdir);
+		} else {
+			*errnop = __libposix_get_errno(PosixENOTDIR);
+		}
+		free(db);
+		break;
+	default:
+		*errnop = ret;
+		break;
+	}
+	return -1;
+}
+
 int
 POSIX_fstat(int *errnop, int file, void *pstat)
 {