flowtop: Add process UI tab entry

Add process UI tab entry to show flows statistics per pid.

Also changed flow_entry which now has pointer to new struct proc_entry
object which contains process related info.

On each 1 second refresh proc_entry is checked if it exists by checking
/proc/<pid> path, and is deleted if there is no any flows related to it
(flows_count is 0), if the process exists then dst & src rates info is
zeroed and summed from the all related flows which are in the
proc_entry->flows list.

The bytes & pkts amount info is collected during all the time process
exists.

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 11 insertions, 0 deletions

diff --git a/proc.c b/proc.c
index c25396a..a0e6499 100644
--- a/proc.c
+++ b/proc.c
@@ -183,3 +183,14 @@ int proc_exec(const char *proc, char *const argv[])
 
 	return 0;
 }
+
+bool proc_exists(pid_t pid)
+{
+	struct stat statbuf;
+	char path[1024];
+
+	if (snprintf(path, sizeof(path), "/proc/%u", pid) < 0)
+		return false;
+
+	return stat(path, &statbuf) == 0;
+}