1 files changed, 142 insertions, 0 deletions

diff --git a/tools/perf/util/target.c b/tools/perf/util/target.c
new file mode 100644
index 000000000000..1064d5b148ad
--- /dev/null
+++ b/tools/perf/util/target.c
@@ -0,0 +1,142 @@
+/*
+ * Helper functions for handling target threads/cpus
+ *
+ * Copyright (C) 2012, LG Electronics, Namhyung Kim <namhyung.kim@lge.com>
+ *
+ * Released under the GPL v2.
+ */
+
+#include "target.h"
+#include "debug.h"
+
+#include <pwd.h>
+#include <string.h>
+
+
+enum perf_target_errno perf_target__validate(struct perf_target *target)
+{
+        enum perf_target_errno ret = PERF_ERRNO_TARGET__SUCCESS;
+
+        if (target->pid)
+                target->tid = target->pid;
+
+        /* CPU and PID are mutually exclusive */
+        if (target->tid && target->cpu_list) {
+                target->cpu_list = NULL;
+                if (ret == PERF_ERRNO_TARGET__SUCCESS)
+                        ret = PERF_ERRNO_TARGET__PID_OVERRIDE_CPU;
+        }
+
+        /* UID and PID are mutually exclusive */
+        if (target->tid && target->uid_str) {
+                target->uid_str = NULL;
+                if (ret == PERF_ERRNO_TARGET__SUCCESS)
+                        ret = PERF_ERRNO_TARGET__PID_OVERRIDE_UID;
+        }
+
+        /* UID and CPU are mutually exclusive */
+        if (target->uid_str && target->cpu_list) {
+                target->cpu_list = NULL;
+                if (ret == PERF_ERRNO_TARGET__SUCCESS)
+                        ret = PERF_ERRNO_TARGET__UID_OVERRIDE_CPU;
+        }
+
+        /* PID and SYSTEM are mutually exclusive */
+        if (target->tid && target->system_wide) {
+                target->system_wide = false;
+                if (ret == PERF_ERRNO_TARGET__SUCCESS)
+                        ret = PERF_ERRNO_TARGET__PID_OVERRIDE_SYSTEM;
+        }
+
+        /* UID and SYSTEM are mutually exclusive */
+        if (target->uid_str && target->system_wide) {
+                target->system_wide = false;
+                if (ret == PERF_ERRNO_TARGET__SUCCESS)
+                        ret = PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM;
+        }
+
+        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;
+}
+
+/*
+ * This must have a same ordering as the enum perf_target_errno.
+ */
+static const char *perf_target__error_str[] = {
+        "PID/TID switch overriding CPU",
+        "PID/TID switch overriding UID",
+        "UID switch overriding CPU",
+        "PID/TID switch overriding SYSTEM",
+        "UID switch overriding SYSTEM",
+        "Invalid User: %s",
+        "Problems obtaining information for user %s",
+};
+
+int perf_target__strerror(struct perf_target *target, int errnum,
+                          char *buf, size_t buflen)
+{
+        int idx;
+        const char *msg;
+
+        if (errnum >= 0) {
+                strerror_r(errnum, buf, buflen);
+                return 0;
+        }
+
+        if (errnum <  __PERF_ERRNO_TARGET__START ||
+            errnum >= __PERF_ERRNO_TARGET__END)
+                return -1;
+
+        idx = errnum - __PERF_ERRNO_TARGET__START;
+        msg = perf_target__error_str[idx];
+
+        switch (errnum) {
+        case PERF_ERRNO_TARGET__PID_OVERRIDE_CPU
+         ... PERF_ERRNO_TARGET__UID_OVERRIDE_SYSTEM:
+                snprintf(buf, buflen, "%s", msg);
+                break;
+
+        case PERF_ERRNO_TARGET__INVALID_UID:
+        case PERF_ERRNO_TARGET__USER_NOT_FOUND:
+                snprintf(buf, buflen, msg, target->uid_str);
+                break;
+
+        default:
+                /* cannot reach here */
+                break;
+        }
+
+        return 0;
+}