From: Steven Rostedt <rostedt@goodmis.org>
To: linux-trace-devel@vger.kernel.org
Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Subject: [PATCH 1/4] libtracefs: Implement tracefs_list_size()
Date: Tue, 6 Jul 2021 23:11:07 -0400 [thread overview]
Message-ID: <20210707031110.249759-2-rostedt@goodmis.org> (raw)
In-Reply-To: <20210707031110.249759-1-rostedt@goodmis.org>
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Add tracefs_list_size() that returns a the size of a list created by
tracefs_list_add().
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
include/tracefs.h | 1 +
src/tracefs-utils.c | 16 ++++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/include/tracefs.h b/include/tracefs.h
index 266c513e4116..6b9a76c4c40a 100644
--- a/include/tracefs.h
+++ b/include/tracefs.h
@@ -65,6 +65,7 @@ int tracefs_error_clear(struct tracefs_instance *instance);
void tracefs_list_free(char **list);
char **tracefs_list_add(char **list, const char *string);
+int tracefs_list_size(char **list);
/**
* tracefs_trace_on_get_fd - Get a file descriptor of "tracing_on" in given instance
diff --git a/src/tracefs-utils.c b/src/tracefs-utils.c
index ec5ecb08ed2e..6750336c9ef6 100644
--- a/src/tracefs-utils.c
+++ b/src/tracefs-utils.c
@@ -447,3 +447,19 @@ char **tracefs_list_add(char **list, const char *string)
return list;
}
+
+/**
+ * tracefs_list_size - Return the number of strings in the list
+ * @list: The list to determine the size.
+ *
+ * Returns the number of elements in the list.
+ * If @list is NULL, then zero is returned.
+ */
+int tracefs_list_size(char **list)
+{
+ if (!list)
+ return 0;
+
+ list--;
+ return (int)*(unsigned long *)list;
+}
--
2.30.2
next prev parent reply other threads:[~2021-07-07 3:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 3:11 [PATCH 0/4] libtracefs: Work to add histogram APIs Steven Rostedt
2021-07-07 3:11 ` Steven Rostedt [this message]
2021-07-07 3:11 ` [PATCH 2/4] libtracefs: Implement functions to work on event directory files Steven Rostedt
2021-07-07 3:11 ` [PATCH 3/4] libtracefs: Have instances have internal ref counting Steven Rostedt
2021-07-07 3:11 ` [PATCH 4/4] libtracefs: Implement API to create / modify and display histograms Steven Rostedt
2021-07-07 8:12 ` Yordan Karadzhov (VMware)
2021-07-07 13:13 ` Steven Rostedt
2021-07-07 13:21 ` Yordan Karadzhov (VMware)
2021-07-07 13:48 ` Steven Rostedt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210707031110.249759-2-rostedt@goodmis.org \
--to=rostedt@goodmis.org \
--cc=linux-trace-devel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).