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tests: don't mix FILE* and UNIX FD I/O on same stream

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There is currently a hang in test27 that exhibits itself on FreeBSD 11.4
only. The behaviour is that virCommandProcessIO gets POLLIN on the
FD for stdout, but read() blocks. Meanwhile commandtest also blocks
in write for stderr because the pipe buffers are full.

This fix in commandhelper likely does not really address the root cause
just hides it due to the buffering done by FILE *. Mixing UNIX FD I/O
and FILE * I/O is bad practice regardless.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2020-09-21 18:32:29 +01:00
parent cb09344a2c
commit 946c815024
1 changed files with 2 additions and 2 deletions
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4
tests/commandhelper.c
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@ -221,9 +221,9 @@ int main(int argc, char **argv) {
}
for (i = 0; i < numpollfds; i++) {
if (write(STDOUT_FILENO, buffers[i], buflen[i]) != buflen[i])
if (fwrite(buffers[i], 1, buflen[i], stdout) != buflen[i])
goto cleanup;
if (write(STDERR_FILENO, buffers[i], buflen[i]) != buflen[i])
if (fwrite(buffers[i], 1, buflen[i], stderr) != buflen[i])
goto cleanup;
}