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conmon: use pipes rather than socketpairs for !terminal

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While pipes have their downsides, it turns out that socketpair(2) will
break any program that tries to open /dev/std{out,err} for writing
(because they're symlinked to /proc/1/fd/{1,2} which will cause lots of
fun issues with sockets).

Signed-off-by: Mrunal Patel <mpatel@redhat.com>
Signed-off-by: Aleksa Sarai <asarai@suse.de>
This commit is contained in:
Aleksa Sarai 2017-04-04 20:04:03 +10:00
parent c290c0d9c3
commit 14a37fb407
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GPG key ID: 9E18AA267DDB8DB4
1 changed files with 5 additions and 3 deletions
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8
conmon/conmon.c
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@ -212,10 +212,12 @@ int main(int argc, char *argv[])
* both cases. The runtime_mfd will be closed after we dup over
* everything.
*
* TODO: Maybe this should be done with pipe(2)s?
* We use pipes here because open(/dev/std{out,err}) will fail if we
* used anything else (and it wouldn't be a good idea to create a new
* pty pair in the host).
*/
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds) < 0)
pexit("Failed to create runtime_mfd socketpair");
if (pipe(fds) < 0)
pexit("Failed to create runtime_mfd pipes");
mfd = fds[0];
runtime_mfd = fds[1];