From: Quentin Rameau <quinq@fifth.space>
Date: Sat, 21 Sep 2019 18:50:20 +0000 (+0200)
Subject: lib/pwdutils: add xgetpwuid
X-Git-Tag: v2.35-rc1~192
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cd083615b4a2d9a1ca01467b8012fedca500e22f;p=thirdparty%2Futil-linux.git

lib/pwdutils: add xgetpwuid
---

diff --git a/include/pwdutils.h b/include/pwdutils.h
index a69dd6b454..bea46e57e3 100644
--- a/include/pwdutils.h
+++ b/include/pwdutils.h
@@ -5,6 +5,7 @@
 #include <pwd.h>
 
 extern struct passwd *xgetpwnam(const char *username, char **pwdbuf);
+extern struct passwd *xgetpwuid(uid_t uid, char **pwdbuf);
 extern char *xgetlogin(void);
 
 #endif /* UTIL_LINUX_PWDUTILS_H */
diff --git a/lib/pwdutils.c b/lib/pwdutils.c
index 25b4daed0e..d54458d65d 100644
--- a/lib/pwdutils.c
+++ b/lib/pwdutils.c
@@ -36,6 +36,34 @@ failed:
 	return NULL;
 }
 
+struct passwd *xgetpwuid(uid_t uid, char **pwdbuf)
+{
+	struct passwd *pwd = NULL, *res = NULL;
+	int rc;
+
+	if (!pwdbuf)
+		return NULL;
+
+	*pwdbuf = xmalloc(UL_GETPW_BUFSIZ);
+	pwd = xcalloc(1, sizeof(struct passwd));
+
+	errno = 0;
+	rc = getpwuid_r(uid, pwd, *pwdbuf, UL_GETPW_BUFSIZ, &res);
+	if (rc != 0) {
+		errno = rc;
+		goto failed;
+	}
+	if (!res) {
+		errno = EINVAL;
+		goto failed;
+	}
+	return pwd;
+failed:
+	free(pwd);
+	free(*pwdbuf);
+	return NULL;
+}
+
 char *xgetlogin(void)
 {
 	struct passwd *pw = NULL;