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SubjectRe: [PATCH 08/24] perf daemon: Add background support
Em Sun, Jan 31, 2021 at 12:48:40AM +0100, Jiri Olsa escreveu:
> 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/builtin-daemon.c | 66 +++++++++++++++++++++++++++++++++++--
> 1 file changed, 63 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
> index d0a0a998e073..324666058842 100644
> --- a/tools/perf/builtin-daemon.c
> +++ b/tools/perf/builtin-daemon.c
> @@ -488,6 +488,13 @@ static void daemon__kill(struct daemon *daemon)
> daemon__signal(daemon, SIGTERM);
> }
>
> +static void __daemon__free(struct daemon *daemon)
> +{
> + free(daemon->config_real);
> + free(daemon->config_base);
> + free(daemon->base);
> +}

Please use zfree(), and also please rename it to __daemon__delete(), in
other cases this pattern would be daemon__exit(), as the daemon
structure itself is not being freed, just its members, ditto for
foo__new() calling foo__init().

> +
> static void daemon__free(struct daemon *daemon)
> {
> struct session *session, *h;
> @@ -495,9 +502,7 @@ static void daemon__free(struct daemon *daemon)
> list_for_each_entry_safe(session, h, &daemon->sessions, list)
> session__remove(session);
>
> - free(daemon->config_real);
> - free(daemon->config_base);
> - free(daemon->base);
> + __daemon__free(daemon);
> }
>
> static void daemon__exit(struct daemon *daemon)
> @@ -643,10 +648,54 @@ 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;
> + }
> +
> + fcntl(fd, F_SETFD, FD_CLOEXEC);
> +
> + close(0);
> + dup2(fd, 1);
> + dup2(fd, 2);
> + close(fd);
> +
> + daemon->out = fdopen(1, "w");
> + if (!daemon->out)
> + 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"),


You forgot to add the entry to the man page

> OPT_PARENT(parent_options),
> OPT_END()
> };
> @@ -667,6 +716,17 @@ 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__free(daemon);
> + return err;
> + }
> + }
> +
> debug_set_file(daemon->out);
> debug_set_display_time(true);
>
> --
> 2.29.2
>

--

- Arnaldo

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