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#include <sys/wait.h>
#include <sys/signal.h>
#include <sys/ioctl.h>
#include "10.h"
waitfor()
{
int pid;
JOB *j;
PROC *p;
JOB *findjob();
union wait status;
/*
* As long as we get something's status back...
*/
while ((pid = wait3(&status, WUNTRACED, 0)) >= 0) {
/*
* Find the job structure which has this
* process.
*/
j = findjob(pid);
/*
* Find the process structure.
*/
for (p = j->procs; p->pid != pid; p = p->next)
/* empty */ ;
/*
* Find out what happened to the process.
*/
if (WIFSTOPPED(status)) {
/*
* See if we know the reason it was
* stopped. The w_stopsig element of
* the structure contains the number
* of the signal which stopped the
* process.
*/
switch (status.w_stopsig) {
case SIGTTIN:
p->status |= PTTYINPUT;
break;
case SIGTTOU:
p->status |= PTTYOUTPUT;
break;
case SIGSTOP:
p->status |= PSTOPSIGNAL;
break;
default:
break;
}
p->status |= PSTOPPED;
j->status |= JNEEDNOTE;
}
else if (WIFEXITED(status)) {
/*
* Normal termination.
*/
if (status.w_retcode == 0)
p->status |= PDONE;
else
p->status |= PEXITED;
p->exitcode = status.w_retcode;
/*
* We're only going to note processes
* exiting if all the processes in the
* job are complete.
*/
if (alldone(j))
j->status |= JNEEDNOTE;
}
else if (WIFSIGNALED(status)) {
p->status |= PSIGNALED;
/*
* Save the termination signal.
*/
p->termsig = status.w_termsig;
/*
* Check for a core dump.
*/
if (status.w_coredump)
p->status |= PCOREDUMP;
/*
* We're only going to note processes
* exiting if all the processes in the
* job are complete.
*/
if (alldone(j))
j->status |= JNEEDNOTE;
}
/*
* If this process is the one which was in the
* foreground, we need to do special things,
* and then return to the main control section
* of the shell.
*/
if (j->pgrp == TermPgrp) {
/*
* If the job is stopped, we need to call
* the stop routine.
*/
if (WIFSTOPPED(status)) {
stop(j);
printf("Stopped\n");
}
/*
* If the job exited or died somehow, we
* need to regain control of the terminal.
*/
if (WIFEXITED(status) || WIFSIGNALED(status)) {
ioctl(1, TIOCSPGRP, &MyPgrp);
TermPgrp = MyPgrp;
}
/*
* Go back.
*/
return;
}
}
}
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