qmail-local代码分析[6]

unsigned long count_file = 0;
unsigned long count_forward = 0;
unsigned long count_program = 0;
char count_buf[FMT_ULONG];

void count_print()
{
 substdio_puts(subfdoutsmall,"did ");
 substdio_put(subfdoutsmall,count_buf,fmt_ulong(count_buf,count_file));
 substdio_puts(subfdoutsmall,"+");
 substdio_put(subfdoutsmall,count_buf,fmt_ulong(count_buf,count_forward));
 substdio_puts(subfdoutsmall,"+");
 substdio_put(subfdoutsmall,count_buf,fmt_ulong(count_buf,count_program));
 substdio_puts(subfdoutsmall,"\n");
 if (mailforward_qp)
  {
   substdio_puts(subfdoutsmall,"qp ");
   substdio_put(subfdoutsmall,count_buf,fmt_ulong(count_buf,mailforward_qp));
   substdio_puts(subfdoutsmall,"\n");
  }
 substdio_flush(subfdoutsmall);
}

void sayit(type,cmd,len)
char *type;
char *cmd;
int len;
{
 substdio_puts(subfdoutsmall,type);
 substdio_put(subfdoutsmall,cmd,len);
 substdio_putsflush(subfdoutsmall,"\n");
}

void main(argc,argv)
int argc;
char **argv;
{
 int opt;
 int i;
 int j;
 int k;
 int fd;
 int numforward;
 char **recips;
 datetime_sec starttime;
 int flagforwardonly;
 char *x;

 umask(077);//将系统umask值设为077&0777的值。open函数的真正权限为mode&-umask
 sig_pipeignore();//忽略信号
//将environ空间扩大（加10个字符串位置）错误返回0
 if (!env_init()) temp_nomem();
//-n Instead of reading and delivering the message, print a description of
//   the delivery instructions. (man page)
//-N 是默认值
 flagdoit = 1;
 while ((opt = getopt(argc,argv,"nN")) != opteof)
   switch(opt)
    {
     case 'n':; flagdoit = 0; break;
     case 'N':; flagdoit = 1; break;
     default:;
       usage();
    }
 argc -= optind;
 argv += optind;
//将参数拷到相应的变量中。
 if (!(user = *argv++)) usage();
 if (!(homedir = *argv++)) usage();
 if (!(local = *argv++)) usage();
 if (!(dash = *argv++)) usage();
 if (!(ext = *argv++)) usage();
 if (!(host = *argv++)) usage();
 if (!(sender = *argv++)) usage();
 if (!(aliasempty = *argv++)) usage();
 if (*argv) usage();
//目录是以'/'开头的
 if (homedir[0] != '/') usage();
 if (chdir(homedir) == -1)
   strerr_die5x(111,"Unable to switch to ",homedir,":; ",error_str(errno),". (#4.3.0)");
 checkhome();
//将"HOST"和host结合为"HOST="+host，加到environ后面。下同
 if (!env_put2("HOST",host)) temp_nomem();//接收地址的域名部分 
 if (!env_put2("HOME",homedir)) temp_nomem();//用户的主目录 
 if (!env_put2("USER",user)) temp_nomem();//当前的用户 
 if (!env_put2("LOCAL",local)) temp_nomem();//接收地址的local部分 
//将本地的地址扩展。如local为"dingwenbin",host为pact518.hit.edu.cn,则envrecip为"dingwenbin@pact518.hit.edu.cn"
 if (!stralloc_copys(&envrecip,local)) temp_nomem();