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SubjectRe: [PATCH 05/24] perf daemon: Add client socket support
Em Sun, Jan 31, 2021 at 12:48:37AM +0100, Jiri Olsa escreveu:
> Adding support for client socket side that will be used
> to send commands to daemon server socket.
>
> This patch adds only the core support, all commands using
> this functionality are coming in following patches.
>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
> tools/perf/builtin-daemon.c | 105 ++++++++++++++++++++++++++++++++++++
> 1 file changed, 105 insertions(+)
>
> diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
> index 756d60616d7d..eada3ceb9b0c 100644
> --- a/tools/perf/builtin-daemon.c
> +++ b/tools/perf/builtin-daemon.c
> @@ -11,6 +11,7 @@
> #include <sys/types.h>
> #include <sys/socket.h>
> #include <sys/un.h>
> +#include <sys/stat.h>
> #include <poll.h>
> #include "builtin.h"
> #include "perf.h"
> @@ -42,6 +43,50 @@ static void sig_handler(int sig __maybe_unused)
> done = true;
> }
>
> +static int client_config(const char *var, const char *value, void *cb)
> +{
> + struct daemon *daemon = cb;
> +
> + if (!strcmp(var, "daemon.base") && !daemon->base_user) {
> + daemon->base = strdup(value);
> + if (!daemon->base)
> + return -ENOMEM;
> + }
> +
> + return 0;
> +}
> +
> +static int check_base(struct daemon *daemon)
> +{
> + struct stat st;
> +
> + if (!daemon->base) {
> + pr_err("failed: base not defined\n");
> + return -EINVAL;
> + }
> +
> + if (stat(daemon->base, &st)) {
> + pr_err("failed: base '%s' does not exists\n", daemon->base);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int setup_client_config(struct daemon *daemon)
> +{
> + struct perf_config_set *set;
> + int err = -ENOMEM;
> +
> + set = perf_config_set__load_file(daemon->config_real);

struct perf_config_set *set = perf_config_set__load_file(daemon->config_real);

> + if (set) {
> + err = perf_config_set(set, client_config, daemon);
> + perf_config_set__delete(set);
> + }
> +
> + return err ?: check_base(daemon);
> +}
> +
> static int setup_server_socket(struct daemon *daemon)
> {
> struct sockaddr_un addr;
> @@ -114,6 +159,32 @@ static int handle_server_socket(struct daemon *daemon __maybe_unused, int sock_f
> return ret;
> }
>
> +static int setup_client_socket(struct daemon *daemon)
> +{
> + struct sockaddr_un addr;
> + char path[100];
> + int fd;
> +
> + fd = socket(AF_UNIX, SOCK_STREAM, 0);

Ditto

> + if (fd == -1) {
> + perror("failed: socket");
> + return -1;
> + }
> +
> + scnprintf(path, PATH_MAX, "%s/control", daemon->base);
> +
> + memset(&addr, 0, sizeof(addr));
> + addr.sun_family = AF_UNIX;
> + strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
> +
> + if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
> + perror("failed: connect");

close fd

> + return -1;
> + }
> +
> + return fd;
> +}
> +
> static void daemon__free(struct daemon *daemon)
> {
> free(daemon->config_real);
> @@ -211,6 +282,40 @@ static int __cmd_start(struct daemon *daemon, struct option parent_options[],
> return err;
> }
>
> +__maybe_unused
> +static int send_cmd(struct daemon *daemon, union cmd *cmd)
> +{
> + char *line = NULL;
> + size_t len = 0;
> + ssize_t nread;
> + FILE *in;
> + int fd;
> +
> + if (setup_client_config(daemon))
> + return -1;
> +
> + fd = setup_client_socket(daemon);
> + if (fd < 0)
> + return -1;
> +
> + if (sizeof(*cmd) != write(fd, cmd, sizeof(*cmd)))

close fd

> + return -1;
> +
> + in = fdopen(fd, "r");
> + if (!in) {
> + perror("failed: fdopen");

close fd

> + return -1;
> + }
> +
> + while ((nread = getline(&line, &len, in)) != -1) {
> + fwrite(line, nread, 1, stdout);
> + fflush(stdout);
> + }
> +
> + fclose(in);
> + return 0;
> +}
> +
> int cmd_daemon(int argc, const char **argv)
> {
> struct option daemon_options[] = {
> --
> 2.29.2
>

--

- Arnaldo

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