bug: open_process causes flickering

[Jörg Sommer <joerg@xxxxxxxxxxxx>]

Hi,

whatbuf();
setbuf("output");
variable pid = open_process("/bin/sleep", "4", 1);
sw2buf( () );
process_query_at_exit(pid, 1);
set_process(pid, "output", "output");

% strace -tt -o /tmp/xj.st xjed /tmp/test.sl -l /tmp/test.sl

After the window poped up I must press a key, otherwise this does not
show the effect I want to show. If it does not work, try it without strace.

Can someone acknowledge that the cursor starts flickering?

20:28:13.731552 execve("/usr/bin/xjed", ["xjed", "/tmp/test.sl", "-l", "/tmp/test.sl"], [/* 30 vars */]) = 0
…
20:28:16.276314 write(3, "M\1\0\5\3\200\0\4\3\200\0\5\0\0\0`\0s\0/M\1\0\5\3\200\0"..., 40) = 40
20:28:16.276628 ioctl(3, FIONREAD, [0]) = 0
20:28:16.276739 select(6, [3 5], NULL, NULL, {45, 0}) = 1 (in [5], left {41, 968000})
20:28:19.306241 read(5, 0x7fae94a8, 512) = -1 EIO (Input/output error)
20:28:19.306442 ioctl(3, FIONREAD, [0]) = 0
20:28:19.306553 select(4, [3], NULL, NULL, {0, 0}) = 0 (Timeout)
20:28:19.306693 ioctl(3, FIONREAD, [0]) = 0
20:28:19.306784 write(3, "M\1\0\5\3\200\0\4\3\200\0\5\0\0\0`\0s\0/", 20) = 20
20:28:19.307254 select(4, [3], NULL, NULL, {0, 0}) = 0 (Timeout)
20:28:19.307404 ioctl(3, FIONREAD, [0]) = 0
20:28:19.307497 select(4, [3], NULL, NULL, {0, 0}) = 0 (Timeout)
20:28:19.307692 write(3, "M\1\0\5\3\200\0\4\3\200\0\6\0\0\0`\0s\0/", 20) = 20
20:28:19.308030 write(3, "M\1\0\5\3\200\0\4\3\200\0\5\0\0\0`\0s\0/M\1\0\5\3\200\0"..., 40) = 40
20:28:19.308330 ioctl(3, FIONREAD, [0]) = 0
20:28:19.308433 select(6, [3 5], NULL, NULL, {45, 0}) = 1 (in [5], left {45, 0})
20:28:19.308555 read(5, 0x7fae94a8, 512) = -1 EIO (Input/output error)
20:28:19.308656 ioctl(3, FIONREAD, [0]) = 0
20:28:19.308741 select(4, [3], NULL, NULL, {0, 0}) = 0 (Timeout)
20:28:19.308842 ioctl(3, FIONREAD, [0]) = 0
20:28:19.308921 write(3, "M\1\0\5\3\200\0\4\3\200\0\5\0\0\0`\0s\0/", 20) = 20
20:28:19.309169 select(4, [3], NULL, NULL, {0, 0}) = 0 (Timeout)

Theses lines repeat very often until

20:28:22.360548 write(3, "M\1\0\5\3\200\0\4\3\200\0\5\0\0\0`\0s\0/", 20) = 20
20:28:22.360720 select(4, [3], NULL, NULL, {0, 0}) = 0 (Timeout)
20:28:22.360803 ioctl(3, FIONREAD, [0]) = 0
20:28:22.360866 select(4, [3], NULL, NULL, {0, 0}) = 0 (Timeout)
20:28:22.360982 write(3, "M\1\0\5\3\200\0\4\3\200\0\6\0\0\0`\0s\0/", 20) = 20
20:28:22.361175 write(3, "M\1\0\5\3\200\0\4\3\200\0\5\0\0\0`\0s\0/M\1\0\5\3\200\0"..., 40) = 40
20:28:22.361366 ioctl(3, FIONREAD, [0]) = 0
20:28:22.361436 select(6, [3 5], NULL, NULL, {45, 0}) = 1 (in [5], left {45, 0})
20:28:22.361522 read(5, 0x7fae94a8, 512) = -1 EIO (Input/output error)
20:28:22.361594 ioctl(3, FIONREAD, [0]) = 0
20:28:22.361775 --- SIGCHLD (Child exited) @ 0 (0) ---

I've put the whole strace log in http://www.minet.uni-jena.de/~joergs/xj.st

I would say the select() is the one in line 537 in unix.c and the ioctl()
is somewhere in the call of jed_insert_nbytes (buf, n) in line 979 in
jprocess.c. I can't really see what goes wrong and where.

Bye, Jörg.
-- 
Nutze die Talente, die du hast. Die Wälder wären sehr still,
wenn nur die begabtesten Vögel sängen.                (Henry van Dyke)

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