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/*
* Conky, a system monitor, based on torsmo
*
* This program is licensed under BSD license, read COPYING
*
* $Id: common.c 727 2006-11-05 00:23:18Z pkovacs $
*/
#include "conky.h"
#include "remoted.h"
#include "remotec.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/time.h>
struct information info;
void update_uname()//得到OS版本信息
{
uname(&info.uname_s);
}
double get_time()//获取时间
{
struct timeval tv;
gettimeofday(&tv, 0);
return tv.tv_sec + (tv.tv_usec / 1000000.0);
}
FILE *open_file(const char *file, int *reported)//通用的open_file，内含出错代码，一个宏！
{
FILE *fp = fopen(file, "r");
if (!fp) {
if (!reported || *reported == 0) {
ERR("can't open %s: %s", file, strerror(errno));
if (reported)
*reported = 1;
}
return 0;
}
return fp;
}
void variable_substitute(const char *s, char *dest, unsigned int n)//读取变量
{
while (*s && n > 1) {
if (*s == '$') {
s++;
if (*s != '$') {
char buf[256];
const char *a, *var;
unsigned int len;
/* variable is either $foo or ${foo} */
if (*s == '{') {
s++;
a = s;
while (*s && *s != '}')
s++;
} else {
a = s;
while (*s && (isalnum((int) *s)
|| *s == '_'))
s++;
}
/* copy variable to buffer and look it up */
len = (s - a > 255) ? 255 : (s - a);
strncpy(buf, a, len);
buf[len] = '\0';
if (*s == '}')
s++;
var = getenv(buf);
if (var) {
/* add var to dest */
len = strlen(var);
if (len >= n)
len = n - 1;
strncpy(dest, var, len);
dest += len;
n -= len;
}
continue;
}
}
*dest++ = *s++;
n--;
}
*dest = '\0';
}
/* network interface stuff *///网络接口部分
static struct net_stat netstats[16];
struct net_stat *get_net_stat(const char *dev)//获取网络信息
{
unsigned int i;
if (!dev)
return 0;
/* find interface stat */
for (i = 0; i < 16; i++) {
if (netstats[i].dev && strcmp(netstats[i].dev, dev) == 0)
return &netstats[i];
}
/* wasn't found? add it */
if (i == 16) {
for (i = 0; i < 16; i++) {
if (netstats[i].dev == 0) {
netstats[i].dev = strdup(dev);
return &netstats[i];
}
}
}
CRIT_ERR("too many interfaces used (limit is 16)");
return 0;
}
void format_seconds(char *buf, unsigned int n, long t)//格式化 秒数
{
if (t >= 24 * 60 * 60) /* hours necessary when there are days? */
snprintf(buf, n, "%ldd %ldh %ldm", t / 60 / 60 / 24,
(t / 60 / 60) % 24, (t / 60) % 60);
else if (t >= 60 * 60)
snprintf(buf, n, "%ldh %ldm", (t / 60 / 60) % 24,
(t / 60) % 60);
else
snprintf(buf, n, "%ldm %lds", t / 60, t % 60);
}
void format_seconds_short(char *buf, unsigned int n, long t)//
{
if (t >= 24 * 60 * 60)
snprintf(buf, n, "%ldd %ldh", t / 60 / 60 / 24,
(t / 60 / 60) % 24);
else if (t >= 60 * 60)
snprintf(buf, n, "%ldh %ldm", (t / 60 / 60) % 24,
(t / 60) % 60);
else
snprintf(buf, n, "%ldm", t / 60);
}
static double last_meminfo_update;//meminfo更新信息
static double last_fs_update;//fs更新信息
unsigned long long need_mask;
void update_stuff()//需要更新的部分
{
unsigned int i;
info.mask = 0;
if (no_buffers)
need_mask |= 1 << INFO_BUFFERS;
/* clear speeds and up status in case device was removed and doesn't get
updated */
for (i = 0; i < 16; i++) {
if (netstats[i].dev) {
netstats[i].up = 0;
netstats[i].recv_speed = 0.0;
netstats[i].trans_speed = 0.0;
}
}
prepare_update();
/* client(); this is approximately where the client should be called */
#define NEED(a) ((need_mask & (1 << a)) && ((info.mask & (1 << a)) == 0))
if (NEED(INFO_UPTIME))
update_uptime();//更新时间
if (NEED(INFO_PROCS))
update_total_processes();//更新的总进程数
if (NEED(INFO_RUN_PROCS))
update_running_processes();//运行的进程
if (NEED(INFO_CPU))
update_cpu_usage();//cpu的使用率
if (NEED(INFO_NET))
update_net_stats();//网络的情况
if (NEED(INFO_DISKIO))
update_diskio();//diskio
if (NEED(INFO_WIFI))
update_wifi_stats();//无线部分
if (NEED(INFO_MAIL))
update_mail_count();//mail的情况
#if defined(__linux__)
if (NEED(INFO_I8K))
update_i8k();//linux需要这个？？
#endif /* __linux__ */
#ifdef MPD
if (NEED(INFO_MPD))
update_mpd();//mpd就是Music Player Daemon for Linux allows remote access to music files and managing playlists
#endif
#ifdef XMMS2
if (NEED(INFO_XMMS2))
update_xmms2();//常用的播放器xmms？
#endif
#ifdef AUDACIOUS
if (NEED(INFO_AUDACIOUS))
update_audacious();//这个播放器我是没有用过
#endif
#ifdef BMPX
if (NEED(INFO_BMPX))
update_bmpx();//bmp吧，我现在就是使用的这个，在xmms的基础上使用gtk2的库开发的
#endif
if (NEED(INFO_LOADAVG))
update_load_average();//系统运行时间
if ((NEED(INFO_MEM) || NEED(INFO_BUFFERS) || NEED(INFO_TOP)) &&
current_update_time - last_meminfo_update > 6.9) {
update_meminfo();
if (no_buffers) {
info.mem -= info.bufmem;
}
last_meminfo_update = current_update_time;
}//这里就可以获取MEM的讯息了
if (NEED(INFO_TOP))
update_top();//top，^_^
/* update_fs_stat() won't do anything if there aren't fs -things *///文件系统的显示
if (NEED(INFO_FS) && current_update_time - last_fs_update > 12.9) {
update_fs_stats();
last_fs_update = current_update_time;
}
#ifdef TCP_PORT_MONITOR
if (NEED(INFO_TCP_PORT_MONITOR))//TCP PORT的显示
update_tcp_port_monitor_collection( info.p_tcp_port_monitor_collection );
#endif
}
int round_to_int(float f)//浮点－－>整型变量的转换
{
int intval = (int)f;
double delta = f - intval;
if (!(delta < 0.5)) {
++intval;
}
return intval;
}
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