mdw@git.distorted.org.uk Git - qmail/blob - predate.c

   1 #include <sys/types.h>
   2 #include <time.h>
   3 #include "datetime.h"
   4 #include "fork.h"
   5 #include "wait.h"
   6 #include "fd.h"
   7 #include "fmt.h"
   8 #include "strerr.h"
   9 #include "substdio.h"
  10 #include "subfd.h"
  11 #include "readwrite.h"
  12 #include "exit.h"
  13
  14 #define FATAL "predate: fatal: "
  15
  16 static char *montab[12] = {
  17 "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"
  18 };
  19
  20 char num[FMT_ULONG];
  21 char outbuf[1024];
  22
  23 void main(argc,argv)
  24 int argc;
  25 char **argv;
  26 {
  27   time_t now;
  28   struct tm *tm;
  29   struct datetime dt;
  30   datetime_sec utc;
  31   datetime_sec local;
  32   int minutes;
  33   int pi[2];
  34   substdio ss;
  35   int wstat;
  36   int pid;
  37
  38   sig_pipeignore();
  39
  40   if (!argv[1])
  41     strerr_die1x(100,"predate: usage: predate child");
  42
  43   if (pipe(pi) == -1)
  44     strerr_die2sys(111,FATAL,"unable to create pipe: ");
  45
  46   switch(pid = fork()) {
  47     case -1:
  48       strerr_die2sys(111,FATAL,"unable to fork: ");
  49     case 0:
  50       close(pi[1]);
  51       if (fd_move(0,pi[0]) == -1)
  52         strerr_die2sys(111,FATAL,"unable to set up fds: ");
  53       sig_pipedefault();
  54       execvp(argv[1],argv + 1);
  55       strerr_die4sys(111,FATAL,"unable to run ",argv[1],": ");
  56   }
  57   close(pi[0]);
  58   substdio_fdbuf(&ss,write,pi[1],outbuf,sizeof(outbuf));
  59
  60   time(&now);
  61
  62   tm = gmtime(&now);
  63   dt.year = tm->tm_year;
  64   dt.mon = tm->tm_mon;
  65   dt.mday = tm->tm_mday;
  66   dt.hour = tm->tm_hour;
  67   dt.min = tm->tm_min;
  68   dt.sec = tm->tm_sec;
  69   utc = datetime_untai(&dt); /* utc == now, if gmtime ignores leap seconds */
  70
  71   tm = localtime(&now);
  72   dt.year = tm->tm_year;
  73   dt.mon = tm->tm_mon;
  74   dt.mday = tm->tm_mday;
  75   dt.hour = tm->tm_hour;
  76   dt.min = tm->tm_min;
  77   dt.sec = tm->tm_sec;
  78   local = datetime_untai(&dt);
  79
  80   substdio_puts(&ss,"Date: ");
  81   substdio_put(&ss,num,fmt_uint(num,dt.mday));
  82   substdio_puts(&ss," ");
  83   substdio_puts(&ss,montab[dt.mon]);
  84   substdio_puts(&ss," ");
  85   substdio_put(&ss,num,fmt_uint(num,dt.year + 1900));
  86   substdio_puts(&ss," ");
  87   substdio_put(&ss,num,fmt_uint0(num,dt.hour,2));
  88   substdio_puts(&ss,":");
  89   substdio_put(&ss,num,fmt_uint0(num,dt.min,2));
  90   substdio_puts(&ss,":");
  91   substdio_put(&ss,num,fmt_uint0(num,dt.sec,2));
  92
  93   if (local < utc) {
  94     minutes = (utc - local + 30) / 60;
  95     substdio_puts(&ss," -");
  96     substdio_put(&ss,num,fmt_uint0(num,minutes / 60,2));
  97     substdio_put(&ss,num,fmt_uint0(num,minutes % 60,2));
  98   }
  99   else {
 100     minutes = (local - utc + 30) / 60;
 101     substdio_puts(&ss," +");
 102     substdio_put(&ss,num,fmt_uint0(num,minutes / 60,2));
 103     substdio_put(&ss,num,fmt_uint0(num,minutes % 60,2));
 104   }
 105
 106   substdio_puts(&ss,"\n");
 107   substdio_copy(&ss,subfdin);
 108   substdio_flush(&ss);
 109   close(pi[1]);
 110
 111   if (wait_pid(&wstat,pid) == -1)
 112     strerr_die2sys(111,FATAL,"wait failed: ");
 113   if (wait_crashed(wstat))
 114     strerr_die2x(111,FATAL,"child crashed");
 115   _exit(wait_exitcode(wstat));
 116 }