perf target: Introduce perf_target__parse_uid()

Add and use the modern perf_target__parse_uid() and get rid of the old
parse_target_uid().

Signed-off-by: Namhyung Kim <namhyung.kim@lge.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1336367344-28071-5-git-send-email-namhyung.kim@lge.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

6 files changed, 42 insertions, 39 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index d16590942cec..d26a279796d9 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -886,9 +886,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
 
         perf_target__validate(&rec->opts.target);
 
-        rec->opts.target.uid = parse_target_uid(rec->opts.target.uid_str);
-        if (rec->opts.target.uid_str != NULL &&
-            rec->opts.target.uid == UINT_MAX - 1)
+        if (perf_target__parse_uid(&rec->opts.target) < 0)
                 goto out_free_fd;
 
         if (perf_evlist__create_maps(evsel_list, &rec->opts.target) < 0)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index e40f86ea3641..c9137ba580d9 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1254,8 +1254,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
 
         perf_target__validate(&top.target);
 
-        top.target.uid = parse_target_uid(top.target.uid_str);
-        if (top.target.uid_str != NULL && top.target.uid == UINT_MAX - 1)
+        if (perf_target__parse_uid(&top.target) < 0)
                 goto out_delete_evlist;
 
         if (top.target.tid == 0 && top.target.pid == 0 &&
diff --git a/tools/perf/util/target.c b/tools/perf/util/target.c
index 5c59dcfc8f8d..02a6bedb69a3 100644
--- a/tools/perf/util/target.c
+++ b/tools/perf/util/target.c
@@ -9,6 +9,8 @@
 #include "target.h"
 #include "debug.h"
 
+#include <pwd.h>
+
 
 enum perf_target_errno perf_target__validate(struct perf_target *target)
 {
@@ -54,3 +56,36 @@ enum perf_target_errno perf_target__validate(struct perf_target *target)
 
         return ret;
 }
+
+enum perf_target_errno perf_target__parse_uid(struct perf_target *target)
+{
+        struct passwd pwd, *result;
+        char buf[1024];
+        const char *str = target->uid_str;
+
+        target->uid = UINT_MAX;
+        if (str == NULL)
+                return PERF_ERRNO_TARGET__SUCCESS;
+
+        /* Try user name first */
+        getpwnam_r(str, &pwd, buf, sizeof(buf), &result);
+
+        if (result == NULL) {
+                /*
+                 * The user name not found. Maybe it's a UID number.
+                 */
+                char *endptr;
+                int uid = strtol(str, &endptr, 10);
+
+                if (*endptr != '\0')
+                        return PERF_ERRNO_TARGET__INVALID_UID;
+
+                getpwuid_r(uid, &pwd, buf, sizeof(buf), &result);
+
+                if (result == NULL)
+                        return PERF_ERRNO_TARGET__USER_NOT_FOUND;
+        }
+
+        target->uid = result->pw_uid;
+        return PERF_ERRNO_TARGET__SUCCESS;
+}
diff --git a/tools/perf/util/target.h b/tools/perf/util/target.h
index eb0d2101154a..d4aabdaba42a 100644
--- a/tools/perf/util/target.h
+++ b/tools/perf/util/target.h
@@ -33,9 +33,14 @@ enum perf_target_errno {
         PERF_ERRNO_TARGET__PID_OVERRIDE_SYSTEM,
         PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM,
 
+        /* for perf_target__parse_uid() */
+        PERF_ERRNO_TARGET__INVALID_UID,
+        PERF_ERRNO_TARGET__USER_NOT_FOUND,
+
         __PERF_ERRNO_TARGET__END,
 };
 
 enum perf_target_errno perf_target__validate(struct perf_target *target);
+enum perf_target_errno perf_target__parse_uid(struct perf_target *target);
 
 #endif /* _PERF_TARGET_H */
diff --git a/tools/perf/util/usage.c b/tools/perf/util/usage.c
index e851abc22ccc..4007aca8e0ca 100644
--- a/tools/perf/util/usage.c
+++ b/tools/perf/util/usage.c
@@ -82,34 +82,3 @@ void warning(const char *warn, ...)
         warn_routine(warn, params);
         va_end(params);
 }
-
-uid_t parse_target_uid(const char *str)
-{
-        struct passwd pwd, *result;
-        char buf[1024];
-
-        if (str == NULL)
-                return UINT_MAX;
-
-        getpwnam_r(str, &pwd, buf, sizeof(buf), &result);
-
-        if (result == NULL) {
-                char *endptr;
-                int uid = strtol(str, &endptr, 10);
-
-                if (*endptr != '\0') {
-                        ui__error("Invalid user %s\n", str);
-                        return UINT_MAX - 1;
-                }
-
-                getpwuid_r(uid, &pwd, buf, sizeof(buf), &result);
-
-                if (result == NULL) {
-                        ui__error("Problems obtaining information for user %s\n",
-                                  str);
-                        return UINT_MAX - 1;
-                }
-        }
-
-        return result->pw_uid;
-}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 52be74c359d3..27a11a78ad39 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -74,7 +74,6 @@
 #include <netinet/tcp.h>
 #include <arpa/inet.h>
 #include <netdb.h>
-#include <pwd.h>
 #include <inttypes.h>
 #include "../../../include/linux/magic.h"
 #include "types.h"
@@ -249,8 +248,6 @@ struct perf_event_attr;
 
 void event_attr_init(struct perf_event_attr *attr);
 
-uid_t parse_target_uid(const char *str);
-
 #define _STR(x) #x
 #define STR(x) _STR(x)