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176 lines
6.2 KiB
C
176 lines
6.2 KiB
C
/* exechelp.h - Definitions for the fork and exec helpers
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* Copyright (C) 2004, 2009, 2010 Free Software Foundation, Inc.
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* Copyright (C) 2004, 2006-2012, 2014-2017 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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* SPDX-License-Identifier: (LGPL-3.0+ OR GPL-2.0+)
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*/
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#ifndef GNUPG_COMMON_EXECHELP_H
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#define GNUPG_COMMON_EXECHELP_H
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/* Return the maximum number of currently allowed file descriptors.
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Only useful on POSIX systems. */
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int get_max_fds (void);
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/* Close all file descriptors starting with descriptor FIRST. If
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EXCEPT is not NULL, it is expected to be a list of file descriptors
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which are not to close. This list shall be sorted in ascending
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order with its end marked by -1. */
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void close_all_fds (int first, int *except);
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/* Returns an array with all currently open file descriptors. The end
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of the array is marked by -1. The caller needs to release this
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array using the *standard free* and not with xfree. This allow the
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use of this function right at startup even before libgcrypt has
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been initialized. Returns NULL on error and sets ERRNO accordingly. */
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int *get_all_open_fds (void);
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/* Portable function to create a pipe. Under Windows the write end is
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inheritable. If R_FP is not NULL, an estream is created for the
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write end and stored at R_FP. */
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gpg_error_t gnupg_create_inbound_pipe (int filedes[2],
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estream_t *r_fp, int nonblock);
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/* Portable function to create a pipe. Under Windows the read end is
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inheritable. If R_FP is not NULL, an estream is created for the
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write end and stored at R_FP. */
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gpg_error_t gnupg_create_outbound_pipe (int filedes[2],
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estream_t *r_fp, int nonblock);
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/* Portable function to create a pipe. Under Windows both ends are
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inheritable. */
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gpg_error_t gnupg_create_pipe (int filedes[2]);
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/* Close the end of a pipe. */
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void gnupg_close_pipe (int fd);
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/* The opaque type for a subprocess. */
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typedef struct gnupg_process *gnupg_process_t;
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#ifdef HAVE_W32_SYSTEM
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struct spawn_cb_arg;
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#ifdef NEED_STRUCT_SPAWN_CB_ARG
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struct spawn_cb_arg {
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HANDLE hd[3];
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HANDLE *inherit_hds;
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BOOL allow_foreground_window;
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void *arg;
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};
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#endif
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#else
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struct spawn_cb_arg {
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int fds[3];
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int *except_fds;
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void *arg;
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};
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#endif
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#define GNUPG_PROCESS_DETACHED (1 << 1)
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/* Specify how to keep/connect standard fds. */
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#define GNUPG_PROCESS_STDIN_PIPE (1 << 8)
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#define GNUPG_PROCESS_STDOUT_PIPE (1 << 9)
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#define GNUPG_PROCESS_STDERR_PIPE (1 << 10)
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#define GNUPG_PROCESS_STDINOUT_SOCKETPAIR (1 << 11)
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#define GNUPG_PROCESS_STDIN_KEEP (1 << 12)
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#define GNUPG_PROCESS_STDOUT_KEEP (1 << 13)
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#define GNUPG_PROCESS_STDERR_KEEP (1 << 14)
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#define GNUPG_PROCESS_STDFDS_SETTING ( GNUPG_PROCESS_STDIN_PIPE \
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| GNUPG_PROCESS_STDOUT_PIPE | GNUPG_PROCESS_STDERR_PIPE \
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| GNUPG_PROCESS_STDINOUT_SOCKETPAIR | GNUPG_PROCESS_STDIN_KEEP \
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| GNUPG_PROCESS_STDOUT_KEEP | GNUPG_PROCESS_STDERR_KEEP)
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#define GNUPG_PROCESS_STREAM_NONBLOCK (1 << 16)
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/* Spawn helper. */
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void gnupg_spawn_helper (struct spawn_cb_arg *sca);
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/* Spawn PGMNAME. */
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gpg_err_code_t gnupg_process_spawn (const char *pgmname, const char *argv[],
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unsigned int flags,
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void (*spawn_cb) (struct spawn_cb_arg *),
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void *spawn_cb_arg,
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gnupg_process_t *r_process);
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/* Get FDs for subprocess I/O. It is the caller which should care
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FDs (closing FDs). */
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gpg_err_code_t gnupg_process_get_fds (gnupg_process_t process,
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unsigned int flags,
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int *r_fd_in, int *r_fd_out,
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int *r_fd_err);
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/* Get STREAMs for subprocess I/O. It is the caller which should care
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STREAMs (closing STREAMs). */
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gpg_err_code_t gnupg_process_get_streams (gnupg_process_t process,
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unsigned int flags,
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gpgrt_stream_t *r_fp_in,
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gpgrt_stream_t *r_fp_out,
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gpgrt_stream_t *r_fp_err);
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enum gnupg_process_requests
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{
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/* Portable requests */
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GNUPG_PROCESS_NOP = 0,
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GNUPG_PROCESS_GET_PROC_ID = 1,
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GNUPG_PROCESS_GET_EXIT_ID = 2,
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/* POSIX only */
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GNUPG_PROCESS_GET_PID = 16,
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GNUPG_PROCESS_GET_WSTATUS = 17,
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GNUPG_PROCESS_KILL = 18,
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/* Windows only */
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GNUPG_PROCESS_GET_P_HANDLE = 32,
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GNUPG_PROCESS_GET_HANDLES = 33,
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GNUPG_PROCESS_GET_EXIT_CODE = 34,
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GNUPG_PROCESS_KILL_WITH_EC = 35
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};
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/* Control of a process. */
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gpg_err_code_t gnupg_process_ctl (gnupg_process_t process,
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unsigned int request, ...);
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/* Wait for a single PROCESS. */
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gpg_err_code_t gnupg_process_wait (gnupg_process_t process, int hang);
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/* Terminate a PROCESS. */
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gpg_err_code_t gnupg_process_terminate (gnupg_process_t process);
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/* Release PROCESS resources. */
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void gnupg_process_release (gnupg_process_t process);
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/* Wait for a multiple processes. */
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gpg_err_code_t gnupg_process_wait_list (gnupg_process_t *process_list,
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int count, int hang);
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#endif /*GNUPG_COMMON_EXECHELP_H*/
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