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int main(int argc, char **argv)//^_^，main在这里
{
struct sigaction act, oact; //信号的数据结构
g_signal_pending=0;
memset(&info, 0, sizeof(info) );//将一段内存空间填入某值
#ifdef TCP_PORT_MONITOR
tcp_port_monitor_collection_args.min_port_monitors = MIN_PORT_MONITORS_DEFAULT;
tcp_port_monitor_args.min_port_monitor_connections = MIN_PORT_MONITOR_CONNECTIONS_DEFAULT;
#endif
/* handle command line parameters that don't change configs */
#ifdef X11
char *s, *temp;
unsigned int x;
//读取环境变量LC_ALL ,LC_CTYPE ,LANG
if (((s = getenv("LC_ALL")) && *s) || ((s = getenv("LC_CTYPE")) &&
*s) || ((s = getenv("LANG")) && *s)) {
temp = (char *)malloc((strlen(s) + 1) * sizeof(char));
if (temp == NULL) {
ERR("malloc failed");
}
for (x = 0; x < strlen(s); x++) {
temp[x] = tolower(s[x]);
}
if (strstr(temp, "utf-8") || strstr(temp, "utf8")) {
utf8_mode = 1;
}
free(temp);
}
if (!setlocale(LC_CTYPE, "")) {//设定locale（LC_CTYPE)
ERR("Can't set the specified locale!\nCheck LANG, LC_CTYPE, LC_ALL.");
}
#endif /* X11 */
while (1) {//这个循环，根据后面参数的不同采取不同的显示
int c = getopt(argc,
argv,
getopt_string);//分析命令行参数
if (c == -1)
break;
switch (c) {
case 'v':
case 'V':
print_version();
case 'c':
/* if current_config is set to a strdup of CONFIG_FILE, free it (even
* though free() does the NULL check itself;), then load optarg value */
if (current_config)
free(current_config);
current_config = strdup(optarg);
break;
case 'h':
printf
("Usage: %s [OPTION]...\n"
"Conky is a system monitor that renders text on desktop or to own transparent\n"
"window. Command line options will override configurations defined in config\n"
"file.\n"
" -V version\n"
" -c FILE config file to load instead of "
CONFIG_FILE
"\n"
" -d daemonize, fork to background\n"
" -h help\n"
#ifdef X11
" -a ALIGNMENT text alignment on screen, {top,bottom}_{left,right}\n"
" -f FONT font to use\n"
#ifdef OWN_WINDOW
" -o create own window to draw\n"
#endif
#ifdef HAVE_XDBE
" -b double buffer (prevents flickering)\n"
#endif
" -w WIN_ID window id to draw\n"
" -x X x position\n"
" -y Y y position\n"
#endif /* X11 */
" -t TEXT text to render, remember single quotes, like -t '$uptime'\n"
" -u SECS update interval\n"
" -i NUM number of times to update Conky\n", argv[0]);
return 0;
#ifdef X11
case 'w':
window.window = strtol(optarg, 0, 0);
break;
#endif /* X11 */
case '?':
exit(EXIT_FAILURE);
}
}
#ifdef X11
/* initalize X BEFORE we load config. (we need to so that 'screen' is set) */
init_X11();//在加载配置之前，初始化x
#endif /* X11 */
/* load current_config or CONFIG_FILE */
#ifdef CONFIG_FILE
if (current_config == NULL) {
/* load default config file */
char buf[256];
variable_substitute(CONFIG_FILE, buf, 256);//读取默认配置文件里的变量
if (buf[0] != '\0')
current_config = strdup(buf);//复制字符串
}
#endif
if (current_config != NULL && fopen((const char *)current_config, (const char *)"r"))
load_config_file(current_config);
else {
set_default_configurations();
}//如果有用户的配置文件，就读取并设置
#ifdef MAIL_FILE
if (current_mail_spool == NULL) {
char buf[256];
variable_substitute(MAIL_FILE, buf, 256);
if (buf[0] != '\0')
current_mail_spool = strdup(buf);
}
#endif
/* handle other command line arguments */
#if defined(__FreeBSD__) || defined (__OpenBSD__) || defined(__NetBSD__)
optind = optreset = 1;
#else
optind = 0;
#endif
#if defined(__FreeBSD__)
if ((kd = kvm_open("/dev/null", "/dev/null", "/dev/null",
O_RDONLY, "kvm_open")) == NULL)
CRIT_ERR( "cannot read kvm");
#endif
while (1) {//读取配置
int c = getopt(argc,
argv,
getopt_string);//分析命令行参数了
if (c == -1)
break;
switch (c) {
case 'd':
fork_to_background = 1;//后台运行
break;
#ifdef X11
case 'f':
set_first_font(optarg);//设置字体了
break;
case 'a':
text_alignment = string_to_alignment(optarg);
break;
#ifdef OWN_WINDOW
case 'o':
own_window = 1;
break;
#endif
#ifdef HAVE_XDBE
case 'b':
use_xdbe = 1;
break;
#endif
#endif /* X11 */
case 't':
if (text != original_text)
free(text);
text = strdup(optarg);
convert_escapes(text);//转义字符
break;
case 'u':
update_interval = strtod(optarg, 0);//将字符串转换为浮点数
break;
case 'i':
total_run_times = strtod(optarg, 0);
break;
#ifdef X11
case 'x':
gap_x = atoi(optarg);//将字符串转换为整型数
break;
case 'y':
gap_y = atoi(optarg);
break;
#endif /* X11 */
case '?':
exit(EXIT_FAILURE);
}
}
#ifdef X11
/* load font */
load_fonts();//加载字体
#endif /* X11 */
/* generate text and get initial size */
extract_variable_text(text);//计算文本，获取初始的大小
if (text != original_text) {
free(text);
}
text = NULL;
/* fork *///fork一个后台进程，也就是使conky作为后台运行
if (fork_to_background) {
int pid = fork();
switch (pid) {
case -1:
ERR("can't fork() to background: %s",
strerror(errno));
break;
case 0:
/* child process */
sleep(1);
fprintf(stderr,"\n");fflush(stderr);
break;
default:
/* parent process */
fprintf(stderr,"Conky: forked to background, pid is %d\n",pid);
fflush(stderr);
return 0;
}
}
update_uname();//更新系统版本信息
generate_text();//计算文本区
#ifdef X11
selected_font = 0;
update_text_area(); /* to get initial size of the window */
//获取窗口的大小
init_window
(own_window,
text_width + border_margin * 2 + 1,
text_height + border_margin * 2 + 1,
set_transparent, background_colour, info.uname_s.nodename, argv, argc);//这个就设置了每一个info的显示
selected_font = 0;
update_text_area(); /* to position text/window on screen */
#endif /* X11 */ //定位text窗口
#ifdef X11
#ifdef OWN_WINDOW
if (own_window && !fixed_pos) {
XMoveWindow(display, window.window, window.x, window.y);
}
if (own_window) {
set_transparent_background(window.window);
}
#endif
create_gc();//这个做什么用？－－是Graphic Context (GC)图形上下文
//在这里有提及
set_font();//设置字体
draw_stuff();//^_^，这里就开始显示了
#endif /* X11 */
/* Set signal handlers */
act.sa_handler = signal_handler;//建立信号处理部分
sigemptyset(&act.sa_mask);//初始化信号集
act.sa_flags = 0;
#ifdef SA_RESTART
act.sa_flags |= SA_RESTART;
#endif
if ( sigaction(SIGINT,&act,&oact) < 0 ||
sigaction(SIGUSR1,&act,&oact) < 0 ||
sigaction(SIGTERM,&act,&oact) < 0 )
{
ERR("error setting signal handler: %s", strerror(errno) );
}
#ifdef AUDACIOUS
if ( (create_audacious_thread() !=0) )
{
CRIT_ERR("unable to create audacious thread!");
}
#endif
main_loop();//主要的循环
#ifdef AUDACIOUS
if ( info.audacious.thread && (destroy_audacious_thread()!=0) )
ERR("error destroying audacious thread");
#endif
#if defined(__FreeBSD__)
kvm_close(kd);
#endif
return 0;
}
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