except.c

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#include <unistd.h>
#include "wait.h"
#include "logmsg.h"
#include "exit.h"
 
#define WHO "except"
 
int main(int argc, char * const *argv)
{
  int pid;
  int wstat;
 
  if (!argv[1])
    logmsg(WHO,100,USAGE,"except program [ arg ... ]");
 
  pid = fork();
  if (pid == -1)
    logmsg(WHO,111,FATAL,"unable to fork: ");
  if (pid == 0) {
    execvp(argv[1],argv + 1);
    if (errno) _exit(111);
    _exit(100);
  }
 
  if (wait_pid(&wstat,pid) == -1)
    logmsg(WHO,111,FATAL,"wait failed");
  if (wait_crashed(wstat))
    logmsg(WHO,111,FATAL,"child crashed");
  switch (wait_exitcode(wstat)) {
    case 0: _exit(100);
    case 111: logmsg(WHO,111,FATAL,"temporary child error");
    default: _exit(0);
  }
}