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slave: emit user-notifications before dup:ing stdin/stdout/stderr

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Since we need to restore the status flags anyway, there's nothing to
gain from emitting the user notifications after dup:ing the pts file
descriptor.

On the other hand, emitting user notifications *before* dup:ing means
we can still print error messages for e.g. write(3) errors.
This commit is contained in:
Daniel Eklöf 2020-08-01 09:00:18 +02:00
parent 7e93405b1a
commit c8e78674ed
No known key found for this signature in database
GPG key ID: 5BBD4992C116573F
2 changed files with 54 additions and 49 deletions
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91
slave.c
View file

@ -67,7 +67,9 @@ err:
return false;
}
static bool
enum user_notification_ret_t {UN_OK, UN_NO_MORE, UN_FAIL};
static enum user_notification_ret_t
emit_one_notification(int fd, const struct user_notification *notif)
{
const char *prefix = NULL;
@ -93,17 +95,39 @@ emit_one_notification(int fd, const struct user_notification *notif)
write(fd, notif->text, strlen(notif->text)) < 0 ||
write(fd, postfix, strlen(postfix)) < 0)
{
if (errno == EWOULDBLOCK || errno == EAGAIN) {
/*
* The main process is blocking and waiting for us to
* close the error pipe. Thus, pts data will *not* be
* processed until we've exec:d. This means we cannot
* write anymore once the kernel buffer is full. Don't
* treat this as a fatal error.
*/
return true;
/*
* The main process is blocking and waiting for us to close
* the error pipe. Thus, pts data will *not* be processed
* until we've exec:d. This means we cannot write anymore once
* the kernel buffer is full. Don't treat this as a fatal
* error.
*/
if (errno == EWOULDBLOCK || errno == EAGAIN)
return UN_NO_MORE;
else {
LOG_ERRNO("failed to write user-notification");
return UN_FAIL;
}
}
return UN_OK;
}
static bool
emit_notifications_of_kind(int fd, const user_notifications_t *notifications,
enum user_notification_kind kind)
{
tll_foreach(*notifications, it) {
if (it->item.kind == kind) {
switch (emit_one_notification(fd, &it->item)) {
case UN_OK:
break;
case UN_NO_MORE:
return true;
case UN_FAIL:
return false;
}
}
return false;
}
return true;
@ -112,31 +136,10 @@ emit_one_notification(int fd, const struct user_notification *notif)
static bool
emit_notifications(int fd, const user_notifications_t *notifications)
{
/* Errors first */
tll_foreach(*notifications, it) {
if (it->item.kind == USER_NOTIFICATION_ERROR) {
if (!emit_one_notification(fd, &it->item))
return false;
}
}
/* Then warnings */
tll_foreach(*notifications, it) {
if (it->item.kind == USER_NOTIFICATION_WARNING) {
if (!emit_one_notification(fd, &it->item))
return false;
}
}
/* Finally deprecation messages */
tll_foreach(*notifications, it) {
if (it->item.kind == USER_NOTIFICATION_DEPRECATED) {
if (!emit_one_notification(fd, &it->item))
return false;
}
}
return true;
return
emit_notifications_of_kind(fd, notifications, USER_NOTIFICATION_ERROR) &&
emit_notifications_of_kind(fd, notifications, USER_NOTIFICATION_WARNING) &&
emit_notifications_of_kind(fd, notifications, USER_NOTIFICATION_DEPRECATED);
}
static void
@ -188,14 +191,6 @@ slave_exec(int ptmx, char *argv[], int err_fd, bool login_shell,
}
}
if (dup2(pts, STDIN_FILENO) == -1 ||
dup2(pts, STDOUT_FILENO) == -1 ||
dup2(pts, STDERR_FILENO) == -1)
{
LOG_ERRNO("failed to dup stdin/stdout/stderr");
goto err;
}
if (tll_length(*notifications) > 0) {
int flags = fcntl(pts, F_GETFL);
if (flags < 0)
@ -209,6 +204,14 @@ slave_exec(int ptmx, char *argv[], int err_fd, bool login_shell,
fcntl(pts, F_SETFL, flags);
}
if (dup2(pts, STDIN_FILENO) == -1 ||
dup2(pts, STDOUT_FILENO) == -1 ||
dup2(pts, STDERR_FILENO) == -1)
{
LOG_ERRNO("failed to dup stdin/stdout/stderr");
goto err;
}
close(pts);
pts = -1;