mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-21 20:40:05 +00:00
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/* Capture output from a subprocess.
|
|
Copyright (C) 2017-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <support/subprocess.h>
|
|
#include <support/capture_subprocess.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <support/check.h>
|
|
#include <support/xunistd.h>
|
|
#include <support/xsocket.h>
|
|
#include <support/xspawn.h>
|
|
|
|
static void
|
|
transfer (const char *what, struct pollfd *pfd, struct xmemstream *stream)
|
|
{
|
|
if (pfd->revents != 0)
|
|
{
|
|
char buf[1024];
|
|
ssize_t ret = TEMP_FAILURE_RETRY (read (pfd->fd, buf, sizeof (buf)));
|
|
if (ret < 0)
|
|
{
|
|
support_record_failure ();
|
|
printf ("error: reading from subprocess %s: %m", what);
|
|
pfd->events = 0;
|
|
pfd->revents = 0;
|
|
}
|
|
else if (ret == 0)
|
|
{
|
|
/* EOF reached. Stop listening. */
|
|
pfd->events = 0;
|
|
pfd->revents = 0;
|
|
}
|
|
else
|
|
/* Store the data just read. */
|
|
TEST_VERIFY (fwrite (buf, ret, 1, stream->out) == 1);
|
|
}
|
|
}
|
|
|
|
static void
|
|
support_capture_poll (struct support_capture_subprocess *result,
|
|
struct support_subprocess *proc)
|
|
{
|
|
struct pollfd fds[2] =
|
|
{
|
|
{ .fd = proc->stdout_pipe[0], .events = POLLIN },
|
|
{ .fd = proc->stderr_pipe[0], .events = POLLIN },
|
|
};
|
|
|
|
do
|
|
{
|
|
xpoll (fds, 2, -1);
|
|
transfer ("stdout", &fds[0], &result->out);
|
|
transfer ("stderr", &fds[1], &result->err);
|
|
}
|
|
while (fds[0].events != 0 || fds[1].events != 0);
|
|
|
|
xfclose_memstream (&result->out);
|
|
xfclose_memstream (&result->err);
|
|
|
|
result->status = support_process_wait (proc);
|
|
}
|
|
|
|
struct support_capture_subprocess
|
|
support_capture_subprocess (void (*callback) (void *), void *closure)
|
|
{
|
|
struct support_capture_subprocess result;
|
|
xopen_memstream (&result.out);
|
|
xopen_memstream (&result.err);
|
|
|
|
struct support_subprocess proc = support_subprocess (callback, closure);
|
|
|
|
support_capture_poll (&result, &proc);
|
|
return result;
|
|
}
|
|
|
|
struct support_capture_subprocess
|
|
support_capture_subprogram (const char *file, char *const argv[])
|
|
{
|
|
struct support_capture_subprocess result;
|
|
xopen_memstream (&result.out);
|
|
xopen_memstream (&result.err);
|
|
|
|
struct support_subprocess proc = support_subprogram (file, argv);
|
|
|
|
support_capture_poll (&result, &proc);
|
|
return result;
|
|
}
|
|
|
|
void
|
|
support_capture_subprocess_free (struct support_capture_subprocess *p)
|
|
{
|
|
free (p->out.buffer);
|
|
free (p->err.buffer);
|
|
}
|