就简单给代码加上些注释，方便理解。第一次浏览，应该会有不正确的理解。后面会继续学习修改。
文件：clamscanclamscan.c
代码如下：
nt main(int argc, char **argv)
{
int ds, dms, ret;
double mb;
struct timeval t1, t2;
#ifndef C_WINDOWS
struct timezone tz;
#endif
struct optstruct *opt;
const char *pt;
//pthread是一个通用的跨平台高性能线程库
//暂时没发现加入的地方
//在程序开始的时候要调用
#if defined(C_WINDOWS) && defined(CL_THREAD_SAFE)
if(!pthread_win32_process_attach_np()) {
mprintf("!Can't start the win32 pthreads layer
");
return 72;
}
#endif
//这里进行参数解析
//具体规则待会查看下
opt = opt_parse(argc, argv, clamscan_shortopt, clamscan_longopt, NULL);
if(!opt) {
mprintf("!Can't parse the command line
");
return 40;
}
//以下开始进行命令判断
if(opt_check(opt, "verbose")) {
mprintf_verbose = 1;
logg_verbose = 1;
}
if(opt_check(opt, "quiet"))
mprintf_quiet = 1;
if(opt_check(opt, "stdout"))
mprintf_stdout = 1;
if(opt_check(opt, "debug")) {
#if defined(C_LINUX)
/* njh@bandsman.co.uk: create a dump if needed */
struct rlimit rlim;
rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
if(setrlimit(RLIMIT_CORE, &rlim) < 0)
perror("setrlimit");
#endif
cl_debug(); /* enable debug messages */
}
if(opt_check(opt, "version")) {
print_version(opt_arg(opt, "database"));
opt_free(opt);
return 0;
}
if(opt_check(opt, "help")) {
opt_free(opt);
help();
return 0;
}
if(opt_check(opt, "recursive"))
recursion = 1;
if(opt_check(opt, "infected"))
printinfected = 1;
if(opt_check(opt, "bell"))
bell = 1;
if(opt_check(opt, "tempdir"))
cl_settempdir(opt_arg(opt, "tempdir"), 0);
if(opt_check(opt, "leave-temps"))
cl_settempdir(NULL, 1);
//日志初始化
if(opt_check(opt, "log")) {
logg_file = opt_arg(opt, "log");
if(logg("#
-------------------------------------------------------------------------------
")) {
mprintf("!Problem with internal logger.
");
opt_free(opt);
return 62;
}
} else
logg_file = NULL;
//一些数字参数合法化检验
if(opt_check(opt, "max-scansize")) {
pt = opt_arg(opt, "max-scansize");
if(!strchr(pt, 'M') && !strchr(pt, 'm')) {
if(!cli_isnumber(pt)) {
logg("!--max-scansize requires a natural number
");
opt_free(opt);
return 40;
}
}
}
if(opt_check(opt, "max-filesize")) {
pt = opt_arg(opt, "max-filesize");
if(!strchr(pt, 'M') && !strchr(pt, 'm')) {
if(!cli_isnumber(pt)) {
logg("!--max-filesize requires a natural number
");
opt_free(opt);
return 40;
}
}
}
if(opt_check(opt, "max-files")) {
if(!cli_isnumber(opt_arg(opt, "max-files"))) {
logg("!--max-files requires a natural number
");
opt_free(opt);
return 40;
}
}
if(opt_check(opt, "max-recursion")) {
if(!cli_isnumber(opt_arg(opt, "max-recursion"))) {
logg("!--max-recursion requires a natural number
");
opt_free(opt);
return 40;
}
}
if(opt_check(opt, "max-mail-recursion")) {
if(!cli_isnumber(opt_arg(opt, "max-mail-recursion"))) {
logg("!--max-mail-recursion requires a natural number
");
opt_free(opt);
return 40;
}
}
if(opt_check(opt, "max-dir-recursion")) {
if(!cli_isnumber(opt_arg(opt, "max-dir-recursion"))) {
logg("!--max-dir-recursion requires a natural number
");
opt_free(opt);
return 40;
}
}
if(opt_check(opt, "max-ratio")) {
if(!cli_isnumber(opt_arg(opt, "max-ratio"))) {
logg("!--max-ratio requires a natural number
");
opt_free(opt);
return 40;
}
}
memset(&info, 0, sizeof(struct s_info));
//设置默认的文件I/O操作
//Windows下二进制
//DEBUG下设置报告方式？
#ifdef C_WINDOWS
_set_fmode(_O_BINARY);
#ifdef CL_DEBUG
{
_CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_FILE);
_CrtSetReportFile(_CRT_ERROR, _CRTDBG_FILE_STDERR);
}
#endif
gettimeofday(&t1, NULL);
#else
gettimeofday(&t1, &tz);
#endif
//这里就开始调用一个扫描的管理类方法来扫毒
//返回的ret说明信息
ret = scanmanager(opt);
//下面开始就是日志记录？
if(!opt_check(opt, "disable-summary") && !opt_check(opt, "no-summary")) {
#ifdef C_WINDOWS
gettimeofday(&t2, NULL);
#else
gettimeofday(&t2, &tz);
#endif
ds = t2.tv_sec - t1.tv_sec;
dms = t2.tv_usec - t1.tv_usec;
ds -= (dms < 0) ? (1):(0);
dms += (dms < 0) ? (1000000):(0);
logg("
----------- SCAN SUMMARY -----------
");
logg("Known viruses: %u
", info.sigs);
logg("Engine version: %s
", cl_retver());
logg("Scanned directories: %u
", info.dirs);
logg("Scanned files: %u
", info.files);
logg("Infected files: %u
", info.ifiles);
if(info.notremoved) {
logg("Not removed: %u
", info.notremoved);
}
if(info.notmoved) {
logg("Not %s: %u
", opt_check(opt, "copy") ? "moved" : "copied", info.notmoved);
}
mb = info.blocks * (CL_COUNT_PRECISION / 1024) / 1024.0;
logg("Data scanned: %2.2lf MB
", mb);
logg("Time: %u.%3.3u sec (%u m %u s)
", ds, dms/1000, ds/60, ds%60);
}
opt_free(opt);
//对应于上面的pthread开始函数
#if defined(C_WINDOWS) && defined(CL_THREAD_SAFE)
if(!pthread_win32_process_detach_np()) {
logg("!Can't stop the win32 pthreads layer
");
return 72;
}
#endif
return ret;
}