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except.c (760B)

      1 #include "fork.h"
      2 #include "strerr.h"
      3 #include "wait.h"
      4 #include "error.h"
      5 #include "exit.h"
      6 
      7 #define FATAL "except: fatal: "
      8 
      9 int main(int argc, char **argv)
     10 {
     11   int pid;
     12   int wstat;
     13 
     14   if (argc == 1)
     15     strerr_die1x(100,"except: usage: except program [ arg ... ]");
     16 
     17   pid = fork();
     18   if (pid == -1)
     19     strerr_die2sys(111,FATAL,"unable to fork: ");
     20   if (pid == 0) {
     21     execvp(argv[1],argv + 1);
     22     if (error_temp(errno)) _exit(111);
     23     _exit(100);
     24   }
     25 
     26   if (wait_pid(&wstat,pid) == -1)
     27     strerr_die2x(111,FATAL,"wait failed");
     28   if (wait_crashed(wstat))
     29     strerr_die2x(111,FATAL,"child crashed");
     30   switch(wait_exitcode(wstat)) {
     31     case 0: _exit(100);
     32     case 111: strerr_die2x(111,FATAL,"temporary child error");
     33     default: _exit(0);
     34   }
     35 }