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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.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <support/capture_subprocess.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/xunistd.h>
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#include <support/xsocket.h>
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static void
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transfer (const char *what, struct pollfd *pfd, struct xmemstream *stream)
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{
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if (pfd->revents != 0)
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{
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char buf[1024];
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ssize_t ret = TEMP_FAILURE_RETRY (read (pfd->fd, buf, sizeof (buf)));
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if (ret < 0)
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{
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support_record_failure ();
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printf ("error: reading from subprocess %s: %m", what);
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pfd->events = 0;
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pfd->revents = 0;
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}
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else if (ret == 0)
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{
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/* EOF reached. Stop listening. */
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pfd->events = 0;
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pfd->revents = 0;
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}
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else
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/* Store the data just read. */
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TEST_VERIFY (fwrite (buf, ret, 1, stream->out) == 1);
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}
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}
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struct support_capture_subprocess
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support_capture_subprocess (void (*callback) (void *), void *closure)
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{
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struct support_capture_subprocess result;
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xopen_memstream (&result.out);
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xopen_memstream (&result.err);
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int stdout_pipe[2];
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xpipe (stdout_pipe);
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int stderr_pipe[2];
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xpipe (stderr_pipe);
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TEST_VERIFY (fflush (stdout) == 0);
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TEST_VERIFY (fflush (stderr) == 0);
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pid_t pid = xfork ();
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if (pid == 0)
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{
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xclose (stdout_pipe[0]);
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xclose (stderr_pipe[0]);
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xdup2 (stdout_pipe[1], STDOUT_FILENO);
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xdup2 (stderr_pipe[1], STDERR_FILENO);
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callback (closure);
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_exit (0);
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}
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xclose (stdout_pipe[1]);
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xclose (stderr_pipe[1]);
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struct pollfd fds[2] =
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{
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{ .fd = stdout_pipe[0], .events = POLLIN },
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{ .fd = stderr_pipe[0], .events = POLLIN },
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};
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do
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{
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xpoll (fds, 2, -1);
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transfer ("stdout", &fds[0], &result.out);
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transfer ("stderr", &fds[1], &result.err);
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}
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while (fds[0].events != 0 || fds[1].events != 0);
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xclose (stdout_pipe[0]);
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xclose (stderr_pipe[0]);
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xfclose_memstream (&result.out);
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xfclose_memstream (&result.err);
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xwaitpid (pid, &result.status, 0);
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return result;
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}
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void
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support_capture_subprocess_free (struct support_capture_subprocess *p)
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{
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free (p->out.buffer);
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free (p->err.buffer);
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}
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