Impelemt an own version of `getpwnam_r'.

[collectd.git] / src / common.c

diff --git a/src/common.c b/src/common.c
index 1addb32..6333ab7 100644 (file)
--- a/src/common.c
+++ b/src/common.c
@@ -27,8 +27,12 @@
 #include "common.h"
 #include "plugin.h"
 
+#if HAVE_PTHREAD_H
+# include <pthread.h>
+#endif
+
 #ifdef HAVE_MATH_H
-#  include <math.h>
+# include <math.h>
 #endif
 
 /* for ntohl and htonl */
@@ -40,6 +44,10 @@
 extern kstat_ctl_t *kc;
 #endif
 
+#if !HAVE_GETPWNAM_R
+static pthread_mutex_t getpwnam_r_lock = PTHREAD_MUTEX_INITIALIZER;
+#endif
+
 void sstrncpy (char *d, const char *s, int len)
 {
        strncpy (d, s, len);
@@ -643,3 +651,55 @@ int parse_values (char *buffer, value_list_t *vl, const data_set_t *ds)
                return (-1);
        return (0);
 } /* int parse_values */
+
+#if !HAVE_GETPWNAM_R
+int getpwnam_r (const char *name, struct passwd *pwbuf, char *buf,
+               size_t buflen, struct passwd **pwbufp)
+{
+       int status = 0;
+       struct passwd *pw;
+
+       memset (pwbuf, '\0', sizeof (struct passwd));
+
+       pthread_mutex_lock (&getpwnam_r_lock);
+
+       do
+       {
+               pw = getpwnam (name);
+               if (pw == NULL)
+               {
+                       status = (errno != 0) ? errno : ENOENT;
+                       break;
+               }
+
+#define GETPWNAM_COPY_MEMBER(member) \
+               if (pw->member != NULL) \
+               { \
+                       int len = strlen (pw->member); \
+                       if (len >= buflen) \
+                       { \
+                               status = ENOMEM; \
+                               break; \
+                       } \
+                       sstrncpy (buf, pw->member, buflen); \
+                       pwbuf->member = buf; \
+                       buf    += (len + 1); \
+                       buflen -= (len + 1); \
+               }
+               GETPWNAM_COPY_MEMBER(pw_name);
+               GETPWNAM_COPY_MEMBER(pw_passwd);
+               GETPWNAM_COPY_MEMBER(pw_gecos);
+               GETPWNAM_COPY_MEMBER(pw_dir);
+               GETPWNAM_COPY_MEMBER(pw_shell);
+
+               pwbuf->pw_uid = pw->pw_uid;
+               pwbuf->pw_gid = pw->pw_gid;
+
+               *pwbufp = pwbuf;
+       } while (0);
+
+       pthread_mutex_unlock (&getpwnam_r_lock);
+
+       return (status);
+} /* int getpwnam_r */
+#endif