int
waitpid(int pid, int *status, int options)
{
int noptions, ret;
int nstatus;
if ((int)status == -1) {
errno = EFAULT;
return (-1);
}
/*
* BSD's wait* routines only support WNOHANG & WUNTRACED
*/
if (options & ~(WNOHANG|WUNTRACED))
return (EINVAL);
noptions = (N_WEXITED|N_WTRAPPED);
if (options & WNOHANG)
noptions |= N_WNOHANG;
if (options & WUNTRACED)
noptions |= N_WUNTRACED; /* == N_WSTOPPED */
ret = _waitpid(pid, &nstatus, noptions);
if (status)
mapstatus(status, nstatus);
return (ret);
}
int
lms_finish_slave(struct pinfo *pinfo, int (*finish)(const struct fds *fds))
{
int r;
if (pinfo->child <= 0)
return 0;
r = finish(&pinfo->master);
if (r == 0)
r = _waitpid(pinfo->child);
else {
r = kill(pinfo->child, SIGKILL);
if (r < 0)
perror("kill");
else
r =_waitpid(pinfo->child);
}
pinfo->child = 0;
return r;
}
int
grantpt(int fildes) {
int retval, serrno, status;
pid_t pid, spid;
gid_t gid;
char* slave;
sigset_t oblock, nblock;
struct group* grp;
retval = -1;
serrno = errno;
if ((slave = ptsname(fildes)) != NULL) {
/*
* Block SIGCHLD.
*/
(void)sigemptyset(&nblock);
(void)sigaddset(&nblock, SIGCHLD);
(void)_sigprocmask(SIG_BLOCK, &nblock, &oblock);
switch (pid = fork()) {
case -1:
break;
case 0: /* child */
/*
* pt_chown expects the master pseudo TTY to be its
* standard input.
*/
(void)_dup2(fildes, STDIN_FILENO);
(void)_sigprocmask(SIG_SETMASK, &oblock, NULL);
execl(_PATH_PTCHOWN, _PATH_PTCHOWN, (char*)NULL);
_exit(EX_UNAVAILABLE);
/* NOTREACHED */
default: /* parent */
/*
* Just wait for the process. Error checking is
* done below.
*/
while ((spid = _waitpid(pid, &status, 0)) == -1 &&
(errno == EINTR))
;
if (spid != -1 && WIFEXITED(status) &&
WEXITSTATUS(status) == EX_OK) {
retval = 0;
} else {
errno = EACCES;
}
break;
}
/*
* Restore process's signal mask.
*/
(void)_sigprocmask(SIG_SETMASK, &oblock, NULL);
if (retval) {
/*
* pt_chown failed. Try to manually change the
* permissions for the slave.
*/
gid = (grp = getgrnam("tty")) ? grp->gr_gid : -1;
if (chown(slave, getuid(), gid) == -1 ||
chmod(slave, S_IRUSR | S_IWUSR | S_IWGRP) == -1) {
errno = EACCES;
} else {
retval = 0;
}
}
}
if (!retval) {
errno = serrno;
}
return (retval);
}
