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// SPDX-License-Identifier: GPL-2.0
#include <internal/lib.h>
#include <subcmd/parse-options.h>
#include <api/fd/array.h>
#include <linux/limits.h>
#include <linux/string.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <poll.h>
#include "builtin.h"
#include "perf.h"
#include "debug.h"
#include "config.h"
#include "util.h"
struct daemon {
const char *config;
char *config_real;
const char *base_user;
char *base;
FILE *out;
char perf[PATH_MAX];
};
static struct daemon __daemon = { };
static const char * const daemon_usage[] = {
"perf daemon start [<options>]",
"perf daemon [<options>]",
NULL
};
static bool done;
static void sig_handler(int sig __maybe_unused)
{
done = true;
}
static int setup_server_socket(struct daemon *daemon)
{
struct sockaddr_un addr;
char path[PATH_MAX];
int fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0) {
fprintf(stderr, "socket: %s\n", strerror(errno));
return -1;
}
if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
perror("failed: fcntl FD_CLOEXEC");
close(fd);
return -1;
}
scnprintf(path, sizeof(path), "%s/control", daemon->base);
if (strlen(path) + 1 >= sizeof(addr.sun_path)) {
pr_err("failed: control path too long '%s'\n", path);
close(fd);
return -1;
}
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strlcpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
unlink(path);
if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
perror("failed: bind");
close(fd);
return -1;
}
if (listen(fd, 1) == -1) {
perror("failed: listen");
close(fd);
return -1;
}
return fd;
}
union cmd {
int cmd;
};
static int handle_server_socket(struct daemon *daemon __maybe_unused, int sock_fd)
{
int ret = -1, fd;
FILE *out = NULL;
union cmd cmd;
fd = accept(sock_fd, NULL, NULL);
if (fd < 0) {
perror("failed: accept");
return -1;
}
if (sizeof(cmd) != readn(fd, &cmd, sizeof(cmd))) {
perror("failed: read");
goto out;
}
out = fdopen(fd, "w");
if (!out) {
perror("failed: fdopen");
goto out;
}
switch (cmd.cmd) {
default:
break;
}
fclose(out);
out:
/* If out is defined, then fd is closed via fclose. */
if (!out)
close(fd);
return ret;
}
static void daemon__exit(struct daemon *daemon)
{
free(daemon->config_real);
free(daemon->base);
}
static int setup_config(struct daemon *daemon)
{
if (daemon->base_user) {
daemon->base = strdup(daemon->base_user);
if (!daemon->base)
return -ENOMEM;
}
if (daemon->config) {
char *real = realpath(daemon->config, NULL);
if (!real) {
perror("failed: realpath");
return -1;
}
daemon->config_real = real;
return 0;
}
if (perf_config_system() && !access(perf_etc_perfconfig(), R_OK))
daemon->config_real = strdup(perf_etc_perfconfig());
else if (perf_config_global() && perf_home_perfconfig())
daemon->config_real = strdup(perf_home_perfconfig());
return daemon->config_real ? 0 : -1;
}
static int __cmd_start(struct daemon *daemon, struct option parent_options[],
int argc, const char **argv)
{
struct option start_options[] = {
OPT_PARENT(parent_options),
OPT_END()
};
int sock_fd = -1;
int sock_pos;
struct fdarray fda;
int err = 0;
argc = parse_options(argc, argv, start_options, daemon_usage, 0);
if (argc)
usage_with_options(daemon_usage, start_options);
if (setup_config(daemon)) {
pr_err("failed: config not found\n");
return -1;
}
debug_set_file(daemon->out);
debug_set_display_time(true);
pr_info("daemon started (pid %d)\n", getpid());
fdarray__init(&fda, 1);
sock_fd = setup_server_socket(daemon);
if (sock_fd < 0)
goto out;
sock_pos = fdarray__add(&fda, sock_fd, POLLIN|POLLERR|POLLHUP, 0);
if (sock_pos < 0)
goto out;
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
while (!done && !err) {
if (fdarray__poll(&fda, -1)) {
if (fda.entries[sock_pos].revents & POLLIN)
err = handle_server_socket(daemon, sock_fd);
}
}
out:
fdarray__exit(&fda);
daemon__exit(daemon);
if (sock_fd != -1)
close(sock_fd);
pr_info("daemon exited\n");
fclose(daemon->out);
return err;
}
int cmd_daemon(int argc, const char **argv)
{
struct option daemon_options[] = {
OPT_INCR('v', "verbose", &verbose, "be more verbose"),
OPT_STRING(0, "config", &__daemon.config,
"config file", "config file path"),
OPT_STRING(0, "base", &__daemon.base_user,
"directory", "base directory"),
OPT_END()
};
perf_exe(__daemon.perf, sizeof(__daemon.perf));
__daemon.out = stdout;
argc = parse_options(argc, argv, daemon_options, daemon_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (argc) {
if (!strcmp(argv[0], "start"))
return __cmd_start(&__daemon, daemon_options, argc, argv);
pr_err("failed: unknown command '%s'\n", argv[0]);
return -1;
}
if (setup_config(&__daemon)) {
pr_err("failed: config not found\n");
return -1;
}
return -1;
}
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