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No need for a loop around the recv() now that we don't have to worry

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about EINTR.  CID 180697
This commit is contained in:
Todd C. Miller 2017-12-12 21:44:23 -07:00
parent bda2f4c441
commit cd0b700543
1 changed files with 69 additions and 71 deletions
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140
src/exec_pty.c
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@ -828,87 +828,85 @@ backchannel_cb(int fd, int what, void *v)
* Read command status from the monitor. * Read command status from the monitor.
* Note that the backchannel is a *blocking* socket. * Note that the backchannel is a *blocking* socket.
*/ */
for (;;) { nread = recv(fd, &cstat, sizeof(cstat), MSG_WAITALL);
nread = recv(fd, &cstat, sizeof(cstat), MSG_WAITALL); switch (nread) {
switch (nread) { case -1:
case -1: switch (errno) {
switch (errno) { case EINTR:
case EINTR: case EAGAIN:
case EAGAIN: /* Nothing ready. */
/* Nothing ready. */
break;
default:
if (ec->cstat->val == CMD_INVALID) {
ec->cstat->type = CMD_ERRNO;
ec->cstat->val = errno;
sudo_debug_printf(SUDO_DEBUG_ERROR,
"%s: failed to read command status: %s",
__func__, strerror(errno));
sudo_ev_loopbreak(ec->evbase);
}
break;
}
break;
case 0:
/* EOF, monitor exited or was killed. */
sudo_debug_printf(SUDO_DEBUG_INFO,
"EOF on backchannel, monitor dead?");
if (ec->cstat->type == CMD_INVALID) {
/* XXX - need new CMD_ type for monitor errors. */
ec->cstat->type = CMD_ERRNO;
ec->cstat->val = ECONNRESET;
}
sudo_ev_loopexit(ec->evbase);
break;
case sizeof(cstat):
/* Check command status. */
switch (cstat.type) {
case CMD_PID:
ec->cmnd_pid = cstat.val;
sudo_debug_printf(SUDO_DEBUG_INFO, "executed %s, pid %d",
ec->details->command, (int)ec->cmnd_pid);
break;
case CMD_WSTATUS:
if (WIFSTOPPED(cstat.val)) {
int signo;
/* Suspend parent and tell monitor how to resume on return. */
sudo_debug_printf(SUDO_DEBUG_INFO,
"command stopped, suspending parent");
signo = suspend_sudo(WSTOPSIG(cstat.val), ec->ppgrp);
schedule_signal(ec, signo);
/* Re-enable I/O events */
add_io_events(ec->evbase);
} else {
/* Command exited or was killed, either way we are done. */
sudo_debug_printf(SUDO_DEBUG_INFO, "command exited or was killed");
sudo_ev_loopexit(ec->evbase);
}
*ec->cstat = cstat;
break;
case CMD_ERRNO:
/* Monitor was unable to execute command or broken pipe. */
sudo_debug_printf(SUDO_DEBUG_INFO, "errno from monitor: %s",
strerror(cstat.val));
sudo_ev_loopbreak(ec->evbase);
*ec->cstat = cstat;
break;
}
/* Keep reading command status messages until EAGAIN or EOF. */
break; break;
default: default:
/* Short read, should not happen. */
if (ec->cstat->val == CMD_INVALID) { if (ec->cstat->val == CMD_INVALID) {
ec->cstat->type = CMD_ERRNO; ec->cstat->type = CMD_ERRNO;
ec->cstat->val = EIO; ec->cstat->val = errno;
sudo_debug_printf(SUDO_DEBUG_ERROR, sudo_debug_printf(SUDO_DEBUG_ERROR,
"%s: failed to read command status: short read", __func__); "%s: failed to read command status: %s",
__func__, strerror(errno));
sudo_ev_loopbreak(ec->evbase); sudo_ev_loopbreak(ec->evbase);
} }
break; break;
} }
debug_return; break;
case 0:
/* EOF, monitor exited or was killed. */
sudo_debug_printf(SUDO_DEBUG_INFO,
"EOF on backchannel, monitor dead?");
if (ec->cstat->type == CMD_INVALID) {
/* XXX - need new CMD_ type for monitor errors. */
ec->cstat->type = CMD_ERRNO;
ec->cstat->val = ECONNRESET;
}
sudo_ev_loopexit(ec->evbase);
break;
case sizeof(cstat):
/* Check command status. */
switch (cstat.type) {
case CMD_PID:
ec->cmnd_pid = cstat.val;
sudo_debug_printf(SUDO_DEBUG_INFO, "executed %s, pid %d",
ec->details->command, (int)ec->cmnd_pid);
break;
case CMD_WSTATUS:
if (WIFSTOPPED(cstat.val)) {
int signo;
/* Suspend parent and tell monitor how to resume on return. */
sudo_debug_printf(SUDO_DEBUG_INFO,
"command stopped, suspending parent");
signo = suspend_sudo(WSTOPSIG(cstat.val), ec->ppgrp);
schedule_signal(ec, signo);
/* Re-enable I/O events */
add_io_events(ec->evbase);
} else {
/* Command exited or was killed, either way we are done. */
sudo_debug_printf(SUDO_DEBUG_INFO, "command exited or was killed");
sudo_ev_loopexit(ec->evbase);
}
*ec->cstat = cstat;
break;
case CMD_ERRNO:
/* Monitor was unable to execute command or broken pipe. */
sudo_debug_printf(SUDO_DEBUG_INFO, "errno from monitor: %s",
strerror(cstat.val));
sudo_ev_loopbreak(ec->evbase);
*ec->cstat = cstat;
break;
}
/* Keep reading command status messages until EAGAIN or EOF. */
break;
default:
/* Short read, should not happen. */
if (ec->cstat->val == CMD_INVALID) {
ec->cstat->type = CMD_ERRNO;
ec->cstat->val = EIO;
sudo_debug_printf(SUDO_DEBUG_ERROR,
"%s: failed to read command status: short read", __func__);
sudo_ev_loopbreak(ec->evbase);
}
break;
} }
debug_return;
} }
/* /*