Commit de69d284 authored by Matthias Dahl's avatar Matthias Dahl Committed by Eli Zaretskii

Fix wait_reading_process_output wait_proc hang

* src/process.c (read_process_output): Track bytes read from
a process.
(wait_reading_process_output): If called recursively through
timers and/or process filters via accept-process-output, it is
possible that the output of wait_proc has already been read by
one of those recursive calls, leaving the original call hanging
forever if no further output arrives through that fd and no
timeout has been set.  Fix that by using the process read
accounting to keep track of how many bytes have been read and
use that as a condition to break out of the infinite loop and
return to the caller as well as to calculate the proper return
value (if a wait_proc is given that is).

* src/process.h (struct Lisp_Process): Add nbytes_read to track
bytes read from a process.

(cherry picked from commit 4ba32858)
parent 76f692e8
......@@ -5009,6 +5009,7 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
struct timespec got_output_end_time = invalid_timespec ();
enum { MINIMUM = -1, TIMEOUT, INFINITY } wait;
int got_some_output = -1;
uintmax_t prev_wait_proc_nbytes_read = wait_proc ? wait_proc->nbytes_read : 0;
#if defined HAVE_GETADDRINFO_A || defined HAVE_GNUTLS
bool retry_for_async;
......@@ -5463,6 +5464,8 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
if (nfds == 0)
/* Exit the main loop if we've passed the requested timeout,
or have read some bytes from our wait_proc (either directly
in this call or indirectly through timers / process filters),
or aren't skipping processes and got some output and
haven't lowered our timeout due to timers or SIGIO and
have waited a long amount of time due to repeated
......@@ -5470,7 +5473,9 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
struct timespec huge_timespec
= make_timespec (TYPE_MAXIMUM (time_t), 2 * TIMESPEC_RESOLUTION);
struct timespec cmp_time = huge_timespec;
if (wait < TIMEOUT)
if (wait < TIMEOUT
|| (wait_proc
&& wait_proc->nbytes_read != prev_wait_proc_nbytes_read))
if (wait == TIMEOUT)
cmp_time = end_time;
......@@ -5785,6 +5790,15 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
maybe_quit ();
/* Timers and/or process filters that we have run could have themselves called
`accept-process-output' (and by that indirectly this function), thus
possibly reading some (or all) output of wait_proc without us noticing it.
This could potentially lead to an endless wait (dealt with earlier in the
function) and/or a wrong return value (dealt with here). */
if (wait_proc && wait_proc->nbytes_read != prev_wait_proc_nbytes_read)
got_some_output = min (INT_MAX, (wait_proc->nbytes_read
- prev_wait_proc_nbytes_read));
return got_some_output;
......@@ -5903,6 +5917,9 @@ read_process_output (Lisp_Object proc, int channel)
coding->mode |= CODING_MODE_LAST_BLOCK;
/* Ignore carryover, it's been added by a previous iteration already. */
p->nbytes_read += nbytes;
/* Now set NBYTES how many bytes we must decode. */
nbytes += carryover;
......@@ -129,6 +129,8 @@ struct Lisp_Process
pid_t pid;
/* Descriptor by which we read from this process. */
int infd;
/* Byte-count modulo (UINTMAX_MAX + 1) for process output read from `infd'. */
uintmax_t nbytes_read;
/* Descriptor by which we write to this process. */
int outfd;
/* Descriptors that were created for this process and that need
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