Implemented functions which return the first unused
uid and gid.
Signed-off-by: Stanislav Kholmanskikh <[email protected]>
---
include/test.h | 7 ++++
lib/tst_uid_gid.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 93 insertions(+), 0 deletions(-)
create mode 100644 lib/tst_uid_gid.c
diff --git a/include/test.h b/include/test.h
index ffc1c8c..9f4cfd7 100644
--- a/include/test.h
+++ b/include/test.h
@@ -264,6 +264,13 @@ void tst_mkfs(void (cleanup_fn)(void), const char *dev,
*/
int tst_fill_file(const char *path, char pattern, size_t bs, size_t bcount);
+/* lib/tst_uid_gid.c
+ *
+ * Return the first unused uid and gid
+ */
+uid_t tst_get_unused_uid(void);
+gid_t tst_get_unused_gid(void);
+
#ifdef TST_USE_COMPAT16_SYSCALL
#define TCID_BIT_SUFFIX "_16"
#elif TST_USE_NEWER64_SYSCALL
diff --git a/lib/tst_uid_gid.c b/lib/tst_uid_gid.c
new file mode 100644
index 0000000..e462d45
--- /dev/null
+++ b/lib/tst_uid_gid.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2013 Oracle and/or its affiliates. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <grp.h>
+#include <limits.h>
+#include <pwd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+uid_t tst_get_unused_uid(void)
+{
+ struct passwd pwd;
+ struct passwd *result;
+ char *buf;
+ size_t bufsize;
+ int s;
+ uid_t uid;
+
+ bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
+ if (bufsize == -1)
+ bufsize = 16384;
+
+ buf = malloc(bufsize);
+ if (buf == NULL)
+ return -1;
+
+ for (uid = 0; uid <= UINT_MAX - 1; uid++) {
+ s = getpwuid_r(uid, &pwd, buf, bufsize, &result);
+ if (result == NULL) {
+ if (s == 0)
+ return uid;
+ else
+ return -1;
+ }
+ }
+
+ free(buf);
+ return -1;
+}
+
+gid_t tst_get_unused_gid(void)
+{
+ struct group grp;
+ struct group *result;
+ char *buf;
+ size_t bufsize;
+ int s;
+ gid_t gid;
+
+ bufsize = sysconf(_SC_GETGR_R_SIZE_MAX);
+ if (bufsize == -1)
+ bufsize = 16384;
+
+ buf = malloc(bufsize);
+ if (buf == NULL)
+ return -1;
+
+ for (gid = 0; gid <= UINT_MAX - 1; gid++) {
+ s = getgrgid_r(gid, &grp, buf, bufsize, &result);
+ if (result == NULL) {
+ if (s == 0)
+ return gid;
+ else
+ return -1;
+ }
+ }
+
+ free(buf);
+ return -1;
+}
--
1.7.1
------------------------------------------------------------------------------
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