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Subject[PATCH 08/24] perf daemon: Add background support
Date
Adding support to put daemon process in the background.

It's now enabled by default and -f option is added to
keep daemon process on the console for debugging.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/Documentation/perf-daemon.txt | 4 ++
tools/perf/builtin-daemon.c | 62 ++++++++++++++++++++++++
2 files changed, 66 insertions(+)

diff --git a/tools/perf/Documentation/perf-daemon.txt b/tools/perf/Documentation/perf-daemon.txt
index 173b3f9f3a41..af5916d1c3e0 100644
--- a/tools/perf/Documentation/perf-daemon.txt
+++ b/tools/perf/Documentation/perf-daemon.txt
@@ -56,6 +56,10 @@ START COMMAND
-------------
The start command creates the daemon process.

+-f::
+--foreground::
+ Do not put the process in background.
+

CONFIG FILE
-----------
diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index bdddaa2ea388..2d7f282809b6 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -675,10 +675,61 @@ static int setup_config(struct daemon *daemon)
return daemon->config_real ? 0 : -1;
}

+static int go_background(struct daemon *daemon)
+{
+ int pid, fd;
+
+ pid = fork();
+ if (pid < 0)
+ return -1;
+
+ if (pid > 0)
+ return 1;
+
+ if (setsid() < 0)
+ return -1;
+
+ umask(0);
+
+ if (chdir(daemon->base)) {
+ perror("failed: chdir");
+ return -1;
+ }
+
+ fd = open("output", O_RDWR|O_CREAT|O_TRUNC, 0644);
+ if (fd < 0) {
+ perror("failed: open");
+ return -1;
+ }
+
+ if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
+ perror("failed: fcntl FD_CLOEXEC");
+ close(fd);
+ return -1;
+ }
+
+ close(0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ close(fd);
+
+ daemon->out = fdopen(1, "w");
+ if (!daemon->out) {
+ close(1);
+ close(2);
+ return -1;
+ }
+
+ setbuf(daemon->out, NULL);
+ return 0;
+}
+
static int __cmd_start(struct daemon *daemon, struct option parent_options[],
int argc, const char **argv)
{
+ bool foreground = false;
struct option start_options[] = {
+ OPT_BOOLEAN('f', "foreground", &foreground, "stay on console"),
OPT_PARENT(parent_options),
OPT_END()
};
@@ -699,6 +750,17 @@ static int __cmd_start(struct daemon *daemon, struct option parent_options[],
if (setup_server_config(daemon))
return -1;

+ if (!foreground) {
+ err = go_background(daemon);
+ if (err) {
+ /* original process, exit normally */
+ if (err == 1)
+ err = 0;
+ daemon__exit(daemon);
+ return err;
+ }
+ }
+
debug_set_file(daemon->out);
debug_set_display_time(true);

--
2.29.2
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