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/* 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/>. */
#ifndef SUPPORT_CAPTURE_SUBPROCESS_H
#define SUPPORT_CAPTURE_SUBPROCESS_H
#include <support/xmemstream.h>
struct support_capture_subprocess
{
struct xmemstream out;
struct xmemstream err;
int status;
};
/* Invoke CALLBACK (CLOSURE) in a subprocess and capture standard
output, standard error, and the exit status. The out.buffer and
err.buffer members in the result are null-terminated strings which
can be examined by the caller (out.out and err.out are NULL). */
struct support_capture_subprocess support_capture_subprocess
(void (*callback) (void *), void *closure);
/* Issue FILE with ARGV arguments by using posix_spawn and capture standard
output, standard error, and the exit status. The out.buffer and err.buffer
are handle as support_capture_subprocess. */
struct support_capture_subprocess support_capture_subprogram
(const char *file, char *const argv[]);
/* Copy the running program into a setgid binary and run it with CHILD_ID
argument. If execution is successful, return the exit status of the child
program, otherwise return a non-zero failure exit code. */
int support_capture_subprogram_self_sgid
(char *child_id);
/* Deallocate the subprocess data captured by
support_capture_subprocess. */
void support_capture_subprocess_free (struct support_capture_subprocess *);
enum support_capture_allow
{
/* No output is allowed. */
sc_allow_none = 0x01,
/* Output to stdout is permitted. */
sc_allow_stdout = 0x02,
/* Output to standard error is permitted. */
sc_allow_stderr = 0x04,
};
/* Check that the subprocess exited and that only the allowed outputs
happened. If STATUS_OR_SIGNAL is nonnegative, it is the expected
(decoded) exit status of the process, as returned by WEXITSTATUS.
If STATUS_OR_SIGNAL is negative, -STATUS_OR_SIGNAL is the expected
termination signal, as returned by WTERMSIG. ALLOWED is a
combination of support_capture_allow flags. Report errors under
the CONTEXT message. */
void support_capture_subprocess_check (struct support_capture_subprocess *,
const char *context,
int status_or_signal, int allowed)
__attribute__ ((nonnull (1, 2)));
#endif /* SUPPORT_CAPTURE_SUBPROCESS_H */
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