trace-cmd: Add pevent_pid_is_registered()

Add the function pevent_pid_is_registered() that returns 1 if the
given pid has a cmdline mapped to it, and 0 otherwise.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/parse-events.c b/parse-events.c
index 1a2c7ca..424b367 100644
--- a/parse-events.c
+++ b/parse-events.c
@@ -120,6 +120,36 @@ static char *find_cmdline(struct pevent *pevent, int pid)
 }
 
 /**
+ * pevent_pid_is_registered - return if a pid has a cmdline registered
+ * @pevent: handle for the pevent
+ * @pid: The pid to check if it has a cmdline registered with.
+ *
+ * Returns 1 if the pid has a cmdline mapped to it
+ * 0 otherwise.
+ */
+int pevent_pid_is_registered(struct pevent *pevent, int pid)
+{
+        const struct cmdline *comm;
+        struct cmdline key;
+
+        if (!pid)
+                return 1;
+
+
+        if (!pevent->cmdlines)
+                cmdline_init(pevent);
+
+        key.pid = pid;
+
+        comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
+                       sizeof(*pevent->cmdlines), cmdline_cmp);
+
+        if (comm)
+                return 1;
+        return 0;
+}
+
+/**
  * pevent_register_comm - register a pid / comm mapping
  * @pevent: handle for the pevent
  * @comm: the command line to register