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| -rw-r--r-- | common/exechelp.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/common/exechelp.h b/common/exechelp.h new file mode 100644 index 0000000..1240fde --- /dev/null +++ b/common/exechelp.h @@ -0,0 +1,207 @@ +/* exechelp.h - Definitions for the fork and exec helpers + * Copyright (C) 2004, 2009, 2010 Free Software Foundation, Inc. + * + * This file is part of GnuPG. + * + * This file is free software; you can redistribute it and/or modify + * it under the terms of either + * + * - the GNU Lesser General Public License as published by the Free + * Software Foundation; either version 3 of the License, or (at + * your option) any later version. + * + * or + * + * - the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * or both in parallel, as here. + * + * This file 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses/>. + */ + +#ifndef GNUPG_COMMON_EXECHELP_H +#define GNUPG_COMMON_EXECHELP_H + + +/* Return the maximum number of currently allowed file descriptors. + Only useful on POSIX systems. */ +int get_max_fds (void); + + +/* Close all file descriptors starting with descriptor FIRST. If + EXCEPT is not NULL, it is expected to be a list of file descriptors + which are not to close. This list shall be sorted in ascending + order with its end marked by -1. */ +void close_all_fds (int first, int *except); + + +/* Returns an array with all currently open file descriptors. The end + of the array is marked by -1. The caller needs to release this + array using the *standard free* and not with xfree. This allow the + use of this function right at startup even before libgcrypt has + been initialized. Returns NULL on error and sets ERRNO accordingly. */ +int *get_all_open_fds (void); + + +/* Portable function to create a pipe. Under Windows the write end is + inheritable. If R_FP is not NULL, an estream is created for the + write end and stored at R_FP. */ +gpg_error_t gnupg_create_inbound_pipe (int filedes[2], + estream_t *r_fp, int nonblock); + +/* Portable function to create a pipe. Under Windows the read end is + inheritable. If R_FP is not NULL, an estream is created for the + write end and stored at R_FP. */ +gpg_error_t gnupg_create_outbound_pipe (int filedes[2], + estream_t *r_fp, int nonblock); + +/* Portable function to create a pipe. Under Windows both ends are + inheritable. */ +gpg_error_t gnupg_create_pipe (int filedes[2]); + + +#define GNUPG_SPAWN_NONBLOCK 16 +#define GNUPG_SPAWN_RUN_ASFW 64 +#define GNUPG_SPAWN_DETACHED 128 +#define GNUPG_SPAWN_KEEP_STDIN 256 +#define GNUPG_SPAWN_KEEP_STDOUT 512 +#define GNUPG_SPAWN_KEEP_STDERR 1024 + +/* Fork and exec the program PGMNAME. + + If R_INFP is NULL connect stdin of the new process to /dev/null; if + it is not NULL store the address of a pointer to a new estream + there. If R_OUTFP is NULL connect stdout of the new process to + /dev/null; if it is not NULL store the address of a pointer to a + new estream there. If R_ERRFP is NULL connect stderr of the new + process to /dev/null; if it is not NULL store the address of a + pointer to a new estream there. On success the pid of the new + process is stored at PID. On error -1 is stored at PID and if + R_OUTFP or R_ERRFP are not NULL, NULL is stored there. + + The arguments for the process are expected in the NULL terminated + array ARGV. The program name itself should not be included there. + If PREEXEC is not NULL, the given function will be called right + before the exec. + + IF EXCEPT is not NULL, it is expected to be an ordered list of file + descriptors, terminated by an entry with the value (-1). These + file descriptors won't be closed before spawning a new program. + + Returns 0 on success or an error code. Calling gnupg_wait_process + and gnupg_release_process is required if the function succeeded. + + FLAGS is a bit vector: + + GNUPG_SPAWN_NONBLOCK + If set the two output streams are created in non-blocking + mode and the input stream is switched to non-blocking mode. + This is merely a convenience feature because the caller + could do the same with gpgrt_set_nonblock. Does not yet + work for Windows. + + GNUPG_SPAWN_DETACHED + If set the process will be started as a background process. + This flag is only useful under W32 (but not W32CE) systems, + so that no new console is created and pops up a console + window when starting the server. Does not work on W32CE. + + GNUPG_SPAWN_RUN_ASFW + On W32 (but not on W32CE) run AllowSetForegroundWindow for + the child. Note that due to unknown problems this actually + allows SetForegroundWindow for all children of this process. + + GNUPG_SPAWN_KEEP_STDIN + GNUPG_SPAWN_KEEP_STDOUT + GNUPG_SPAWN_KEEP_STDERR + Do not assign /dev/null to a non-required standard file + descriptor. + + */ +gpg_error_t +gnupg_spawn_process (const char *pgmname, const char *argv[], + int *execpt, void (*preexec)(void), unsigned int flags, + estream_t *r_infp, + estream_t *r_outfp, + estream_t *r_errfp, + pid_t *pid); + + +/* Simplified version of gnupg_spawn_process. This function forks and + then execs PGMNAME, while connecting INFD to stdin, OUTFD to stdout + and ERRFD to stderr (any of them may be -1 to connect them to + /dev/null). The arguments for the process are expected in the NULL + terminated array ARGV. The program name itself should not be + included there. Calling gnupg_wait_process and + gnupg_release_process is required. Returns 0 on success or an + error code. */ +gpg_error_t gnupg_spawn_process_fd (const char *pgmname, + const char *argv[], + int infd, int outfd, int errfd, + pid_t *pid); + + +/* If HANG is true, waits for the process identified by PID to exit; + if HANG is false, checks whether the process has terminated. + PGMNAME should be the same as supplied to the spawn function and is + only used for diagnostics. Return values: + + 0 + The process exited successful. 0 is stored at R_EXITCODE. + + GPG_ERR_GENERAL + The process exited without success. The exit code of process + is then stored at R_EXITCODE. An exit code of -1 indicates + that the process terminated abnormally (e.g. due to a signal). + + GPG_ERR_TIMEOUT + The process is still running (returned only if HANG is false). + + GPG_ERR_INV_VALUE + An invalid PID has been specified. + + Other error codes may be returned as well. Unless otherwise noted, + -1 will be stored at R_EXITCODE. R_EXITCODE may be passed as NULL + if the exit code is not required (in that case an error message will + be printed). Note that under Windows PID is not the process id but + the handle of the process. */ +gpg_error_t gnupg_wait_process (const char *pgmname, pid_t pid, int hang, + int *r_exitcode); + +/* Like gnupg_wait_process, but for COUNT processes. */ +gpg_error_t gnupg_wait_processes (const char **pgmnames, pid_t *pids, + size_t count, int hang, int *r_exitcodes); + + +/* Kill a process; that is send an appropriate signal to the process. + gnupg_wait_process must be called to actually remove the process + from the system. An invalid PID is ignored. */ +void gnupg_kill_process (pid_t pid); + +/* Release the process identified by PID. This function is actually + only required for Windows but it does not harm to always call it. + It is a nop if PID is invalid. */ +void gnupg_release_process (pid_t pid); + + +/* Spawn a new process and immediately detach from it. The name of + the program to exec is PGMNAME and its arguments are in ARGV (the + programname is automatically passed as first argument). + Environment strings in ENVP are set. An error is returned if + pgmname is not executable; to make this work it is necessary to + provide an absolute file name. */ +gpg_error_t gnupg_spawn_process_detached (const char *pgmname, + const char *argv[], + const char *envp[] ); + + + +#endif /*GNUPG_COMMON_EXECHELP_H*/ |