mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
91b6eb1140
This is intended as a type-safe alternative to obstacks and hand-written realloc constructs. The implementation avoids writing function pointers to the heap.
109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/* Capture output from a subprocess.
|
|
Copyright (C) 2017 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <support/capture_subprocess.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <support/check.h>
|
|
#include <support/xunistd.h>
|
|
#include <support/xsocket.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);
|
|
}
|
|
}
|
|
|
|
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);
|
|
|
|
int stdout_pipe[2];
|
|
xpipe (stdout_pipe);
|
|
int stderr_pipe[2];
|
|
xpipe (stderr_pipe);
|
|
|
|
TEST_VERIFY (fflush (stdout) == 0);
|
|
TEST_VERIFY (fflush (stderr) == 0);
|
|
|
|
pid_t pid = xfork ();
|
|
if (pid == 0)
|
|
{
|
|
xclose (stdout_pipe[0]);
|
|
xclose (stderr_pipe[0]);
|
|
xdup2 (stdout_pipe[1], STDOUT_FILENO);
|
|
xdup2 (stderr_pipe[1], STDERR_FILENO);
|
|
callback (closure);
|
|
_exit (0);
|
|
}
|
|
xclose (stdout_pipe[1]);
|
|
xclose (stderr_pipe[1]);
|
|
|
|
struct pollfd fds[2] =
|
|
{
|
|
{ .fd = stdout_pipe[0], .events = POLLIN },
|
|
{ .fd = 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);
|
|
xclose (stdout_pipe[0]);
|
|
xclose (stderr_pipe[0]);
|
|
|
|
xfclose_memstream (&result.out);
|
|
xfclose_memstream (&result.err);
|
|
xwaitpid (pid, &result.status, 0);
|
|
return result;
|
|
}
|
|
|
|
void
|
|
support_capture_subprocess_free (struct support_capture_subprocess *p)
|
|
{
|
|
free (p->out.buffer);
|
|
free (p->err.buffer);
|
|
}
|