2 This file is part of GNUnet.
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2011 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @author Christian Grothoff
23 * @author Krista Bennett
24 * @author Gerd Knorr <kraxel@bytesex.org>
25 * @author Ioana Patrascu
26 * @author Tzvetan Horozov
30 * Low level process routines
32 * @defgroup os OS library
33 * Low level process routines.
35 * This code manages child processes. We can communicate with child
36 * processes using signals. Because signals are not supported on W32
37 * and Java (at least not nicely), we can alternatively use a pipe
38 * to send signals to the child processes (if the child process is
39 * a full-blown GNUnet process that supports reading signals from
40 * a pipe, of course). Naturally, this also only works for 'normal'
41 * termination via signals, and not as a replacement for SIGKILL.
42 * Thus using pipes to communicate signals should only be enabled if
43 * the child is a Java process OR if we are on Windoze.
48 #ifndef GNUNET_OS_LIB_H
49 #define GNUNET_OS_LIB_H
54 #if 0 /* keep Emacsens' auto-indent happy */
59 #include "gnunet_common.h"
60 #include "gnunet_configuration_lib.h"
61 #include "gnunet_scheduler_lib.h"
65 * Flags that determine which of the standard streams
66 * should be inherited by the child process.
68 enum GNUNET_OS_InheritStdioFlags {
70 * No standard streams should be inherited.
72 GNUNET_OS_INHERIT_STD_NONE = 0,
75 * When this flag is set, the child process will
76 * inherit stdin of the parent.
78 GNUNET_OS_INHERIT_STD_IN = 1,
81 * When this flag is set, the child process will
82 * inherit stdout of the parent.
84 GNUNET_OS_INHERIT_STD_OUT = 2,
87 * When this flag is set, the child process will
88 * inherit stderr of the parent.
90 GNUNET_OS_INHERIT_STD_ERR = 4,
93 * When these flags are set, the child process will
94 * inherit stdout and stderr of the parent.
96 GNUNET_OS_INHERIT_STD_OUT_AND_ERR = 6,
99 * Use this option to have all of the standard streams
100 * (stdin, stdout and stderror) be inherited.
102 GNUNET_OS_INHERIT_STD_ALL = 7
107 * Process information (OS-dependent)
109 struct GNUNET_OS_Process;
113 * Possible installation paths to request
115 enum GNUNET_OS_InstallationPathKind {
117 * Return the "PREFIX" directory given to configure.
119 GNUNET_OS_IPK_PREFIX,
122 * Return the directory where the program binaries are installed. (bin/)
124 GNUNET_OS_IPK_BINDIR,
127 * Return the directory where libraries are installed. (lib/gnunet/)
129 GNUNET_OS_IPK_LIBDIR,
132 * Return the directory where data is installed (share/gnunet/)
134 GNUNET_OS_IPK_DATADIR,
137 * Return the directory where translations are installed (share/locale/)
139 GNUNET_OS_IPK_LOCALEDIR,
142 * Return the installation directory of this application, not
143 * the one of the overall GNUnet installation (in case they
146 GNUNET_OS_IPK_SELF_PREFIX,
149 * Return the prefix of the path with application icons (share/icons/).
151 GNUNET_OS_IPK_ICONDIR,
154 * Return the prefix of the path with documentation files, including the
155 * license (share/doc/gnunet/).
157 GNUNET_OS_IPK_DOCDIR,
160 * Return the directory where helper binaries are installed (lib/gnunet/libexec/)
162 GNUNET_OS_IPK_LIBEXECDIR
167 * Process status types
169 enum GNUNET_OS_ProcessStatusType {
171 * The process is not known to the OS (or at
172 * least not one of our children).
174 GNUNET_OS_PROCESS_UNKNOWN,
177 * The process is still running.
179 GNUNET_OS_PROCESS_RUNNING,
182 * The process is paused (but could be resumed).
184 GNUNET_OS_PROCESS_STOPPED,
187 * The process exited with a return code.
189 GNUNET_OS_PROCESS_EXITED,
192 * The process was killed by a signal.
194 GNUNET_OS_PROCESS_SIGNALED
199 * Project-specific data used to help the OS subsystem
200 * find installation paths.
202 struct GNUNET_OS_ProjectData {
204 * Name of a library that is installed in the "lib/" directory of
205 * the project, such as "libgnunetutil". Used to locate the
206 * installation by scanning dependencies of the current process.
211 * Name of the project that is used in the "libexec" prefix, For
212 * example, "gnunet". Certain helper binaries are then expected to
213 * be installed in "$PREFIX/libexec/gnunet/" and resources in
214 * "$PREFIX/share/gnunet/".
216 const char *project_dirname;
219 * Name of a project-specific binary that should be in "$PREFIX/bin/".
220 * Used to determine installation path from $PATH variable.
221 * For example "gnunet-arm". On W32, ".exe" should be omitted.
223 const char *binary_name;
226 * Name of an environment variable that can be used to override
227 * installation path detection, for example "GNUNET_PREFIX".
229 const char *env_varname;
232 * Alternative name of an environment variable that can be used to
233 * override installation path detection, if "env_varname" is not
234 * set. Again, for example, "GNUNET_PREFIX".
236 const char *env_varname_alt;
239 * Name of an environment variable that can be used to override
240 * the location from which default configuration files are loaded
241 * from, for example "GNUNET_BASE_CONFIG".
243 const char *base_config_varname;
246 * E-mail address for reporting bugs.
248 const char *bug_email;
253 const char *homepage;
256 * Configuration file name (in $XDG_CONFIG_HOME) to use.
258 const char *config_file;
261 * Configuration file name to use (if $XDG_CONFIG_HOME is not set).
263 const char *user_config_file;
266 * String identifying the current project version.
271 * Non-zero means this project is part of GNU.
276 * Gettext domain for localisation, e.g. the PACKAGE macro.
277 * Setting this field to NULL disables gettext.
279 char *gettext_domain;
282 * Gettext directory, e.g. the LOCALEDIR macro.
283 * If this field is NULL, the path is automatically inferred.
290 * Return default project data used by 'libgnunetutil' for GNUnet.
292 const struct GNUNET_OS_ProjectData *
293 GNUNET_OS_project_data_default(void);
297 * @return current (actual) project data.
299 const struct GNUNET_OS_ProjectData *
300 GNUNET_OS_project_data_get(void);
304 * Setup OS subsystem with project data.
306 * @param pd project data used to determine paths.
309 GNUNET_OS_init(const struct GNUNET_OS_ProjectData *pd);
313 * Get the path to a specific GNUnet installation directory or, with
314 * #GNUNET_OS_IPK_SELF_PREFIX, the current running apps installation
317 * @param dirkind what kind of directory is desired?
318 * @return a pointer to the dir path (to be freed by the caller)
321 GNUNET_OS_installation_get_path(enum GNUNET_OS_InstallationPathKind dirkind);
325 * Given the name of a gnunet-helper, gnunet-service or gnunet-daemon
326 * binary, try to prefix it with the libexec/-directory to get the
329 * @param progname name of the binary
330 * @return full path to the binary, if possible, otherwise copy of 'progname'
333 GNUNET_OS_get_libexec_binary_path(const char *progname);
337 * Given the name of a helper, service or daemon binary construct the full
338 * path to the binary using the SUID_BINARY_PATH in the PATHS section of the
339 * configuration. If that option is not present, fall back to
340 * GNUNET_OS_get_libexec_binary_path. If @a progname is an absolute path, a
341 * copy of this path is returned.
343 * @param cfg configuration to inspect
344 * @param progname name of the binary
345 * @return full path to the binary, if possible, a copy of @a progname
349 GNUNET_OS_get_suid_binary_path(const struct GNUNET_CONFIGURATION_Handle *cfg,
350 const char *progname);
354 * Callback function invoked for each interface found.
357 * @param name name of the interface (can be NULL for unknown)
358 * @param isDefault is this presumably the default interface
359 * @param addr address of this interface (can be NULL for unknown or unassigned)
360 * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
361 * @param netmask the network mask (can be NULL for unknown or unassigned)
362 * @param addrlen length of the address
363 * @return #GNUNET_OK to continue iteration, #GNUNET_SYSERR to abort
366 (*GNUNET_OS_NetworkInterfaceProcessor) (void *cls,
369 const struct sockaddr *addr,
370 const struct sockaddr *broadcast_addr,
371 const struct sockaddr *netmask,
376 * @brief Enumerate all network interfaces
378 * @param proc the callback function
379 * @param proc_cls closure for @a proc
382 GNUNET_OS_network_interfaces_list(GNUNET_OS_NetworkInterfaceProcessor proc,
386 * @brief Get maximum string length returned by gethostname()
388 #if HAVE_SYSCONF && defined(_SC_HOST_NAME_MAX)
389 #define GNUNET_OS_get_hostname_max_length() ({ int __sc_tmp = sysconf(_SC_HOST_NAME_MAX); __sc_tmp <= 0 ? 255 : __sc_tmp; })
390 #elif defined(HOST_NAME_MAX)
391 #define GNUNET_OS_get_hostname_max_length() HOST_NAME_MAX
393 #define GNUNET_OS_get_hostname_max_length() 255
398 * Get process structure for current process
400 * The pointer it returns points to static memory location and must not be
403 * @return pointer to the process sturcutre for this process
405 struct GNUNET_OS_Process *
406 GNUNET_OS_process_current(void);
410 * Sends a signal to the process
412 * @param proc pointer to process structure
414 * @return 0 on success, -1 on error
417 GNUNET_OS_process_kill(struct GNUNET_OS_Process *proc,
422 * Cleans up process structure contents (OS-dependent) and deallocates it
424 * @param proc pointer to process structure
427 GNUNET_OS_process_destroy(struct GNUNET_OS_Process *proc);
431 * Get the pid of the process in question
433 * @param proc the process to get the pid of
435 * @return the current process id
438 GNUNET_OS_process_get_pid(struct GNUNET_OS_Process *proc);
444 * @param pipe_control should a pipe be used to send signals to the child?
445 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
446 * @param pipe_stdin pipe to use to send input to child process (or NULL)
447 * @param pipe_stdout pipe to use to get output from child process (or NULL)
448 * @param pipe_stderr pipe to use to get error output from child process (or NULL)
449 * @param filename name of the binary
450 * @param argv NULL-terminated array of arguments to the process
451 * @return pointer to process structure of the new process, NULL on error
453 struct GNUNET_OS_Process *
454 GNUNET_OS_start_process_vap(int pipe_control,
455 enum GNUNET_OS_InheritStdioFlags std_inheritance,
456 struct GNUNET_DISK_PipeHandle *pipe_stdin,
457 struct GNUNET_DISK_PipeHandle *pipe_stdout,
458 struct GNUNET_DISK_PipeHandle *pipe_stderr,
459 const char *filename,
466 * @param pipe_control should a pipe be used to send signals to the child?
467 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
468 * @param pipe_stdin pipe to use to send input to child process (or NULL)
469 * @param pipe_stdout pipe to use to get output from child process (or NULL)
470 * @param pipe_stderr pipe to use to get error output from child process (or NULL)
471 * @param filename name of the binary
472 * @param ... NULL-terminated list of arguments to the process
473 * @return pointer to process structure of the new process, NULL on error
475 struct GNUNET_OS_Process *
476 GNUNET_OS_start_process(int pipe_control,
477 enum GNUNET_OS_InheritStdioFlags std_inheritance,
478 struct GNUNET_DISK_PipeHandle *pipe_stdin,
479 struct GNUNET_DISK_PipeHandle *pipe_stdout,
480 struct GNUNET_DISK_PipeHandle *pipe_stderr,
481 const char *filename, ...);
487 * @param pipe_control should a pipe be used to send signals to the child?
488 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
489 * @param pipe_stdin pipe to use to send input to child process (or NULL)
490 * @param pipe_stdout pipe to use to get output from child process (or NULL)
491 * @param pipe_stderr pipe to use to get error output from child process (or NULL)
492 * @param filename name of the binary
493 * @param va NULL-terminated list of arguments to the process
494 * @return pointer to process structure of the new process, NULL on error
496 struct GNUNET_OS_Process *
497 GNUNET_OS_start_process_va(int pipe_control,
498 enum GNUNET_OS_InheritStdioFlags std_inheritance,
499 struct GNUNET_DISK_PipeHandle *pipe_stdin,
500 struct GNUNET_DISK_PipeHandle *pipe_stdout,
501 struct GNUNET_DISK_PipeHandle *pipe_stderr,
502 const char *filename, va_list va);
507 * @param pipe_control should a pipe be used to send signals to the child?
508 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
509 * @param lsocks array of listen sockets to dup systemd-style (or NULL);
510 * must be NULL on platforms where dup is not supported
511 * @param filename name of the binary
512 * @param argv NULL-terminated list of arguments to the process,
513 * including the process name as the first argument
514 * @return pointer to process structure of the new process, NULL on error
516 struct GNUNET_OS_Process *
517 GNUNET_OS_start_process_v(int pipe_control,
518 enum GNUNET_OS_InheritStdioFlags std_inheritance,
519 const SOCKTYPE *lsocks,
520 const char *filename,
525 * Start a process. This function is similar to the GNUNET_OS_start_process_*
526 * except that the filename and arguments can have whole strings which contain
527 * the arguments. These arguments are to be separated by spaces and are parsed
528 * in the order they appear. Arguments containing spaces can be used by
529 * quoting them with @em ".
531 * @param pipe_control should a pipe be used to send signals to the child?
532 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
533 * @param lsocks array of listen sockets to dup systemd-style (or NULL);
534 * must be NULL on platforms where dup is not supported
535 * @param filename name of the binary. It is valid to have the arguments
536 * in this string when they are separated by spaces.
537 * @param ... more arguments. Should be of type `char *`. It is valid
538 * to have the arguments in these strings when they are separated by
539 * spaces. The last argument MUST be NULL.
540 * @return pointer to process structure of the new process, NULL on error
542 struct GNUNET_OS_Process *
543 GNUNET_OS_start_process_s(int pipe_control,
544 unsigned int std_inheritance,
545 const SOCKTYPE * lsocks,
546 const char *filename, ...);
550 * Handle to a command action.
552 struct GNUNET_OS_CommandHandle;
556 * Type of a function to process a line of output.
559 * @param line line of output from a command, NULL for the end
562 (*GNUNET_OS_LineProcessor) (void *cls, const char *line);
566 * Stop/kill a command.
568 * @param cmd handle to the process
571 GNUNET_OS_command_stop(struct GNUNET_OS_CommandHandle *cmd);
575 * Run the given command line and call the given function
576 * for each line of the output.
578 * @param proc function to call for each line of the output
579 * @param proc_cls closure for proc
580 * @param timeout when to time out
581 * @param binary command to run
582 * @param ... arguments to command
583 * @return NULL on error
585 struct GNUNET_OS_CommandHandle *
586 GNUNET_OS_command_run(GNUNET_OS_LineProcessor proc,
588 struct GNUNET_TIME_Relative timeout,
594 * Retrieve the status of a process, waiting on it if dead.
595 * Nonblocking version.
597 * @param proc pointer to process structure
598 * @param type status type
599 * @param code return code/signal number
600 * @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
603 GNUNET_OS_process_status(struct GNUNET_OS_Process *proc,
604 enum GNUNET_OS_ProcessStatusType *type,
605 unsigned long *code);
609 * Wait for a process to terminate. The return code is discarded.
610 * You must not use #GNUNET_OS_process_status() on the same process
611 * after calling this function! This function is blocking and should
612 * thus only be used if the child process is known to have terminated
613 * or to terminate very soon.
615 * @param proc pointer to process structure of the process to wait for
616 * @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
619 GNUNET_OS_process_wait(struct GNUNET_OS_Process *proc);
624 * Retrieve the status of a process, waiting on it if dead.
627 * @param proc pointer to process structure
628 * @param type status type
629 * @param code return code/signal number
630 * @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
633 GNUNET_OS_process_wait_status(struct GNUNET_OS_Process *proc,
634 enum GNUNET_OS_ProcessStatusType *type,
635 unsigned long *code);
639 * Connects this process to its parent via pipe;
640 * essentially, the parent control handler will read signal numbers
641 * from the #GNUNET_OS_CONTROL_PIPE (as given in an environment
642 * variable) and raise those signals.
644 * @param cls closure (unused)
647 GNUNET_OS_install_parent_control_handler(void *cls);
651 * Check whether an executable exists and possibly
652 * if the suid bit is set on the file.
653 * Attempts to find the file using the current
654 * PATH environment variable as a search path.
656 * @param binary the name of the file to check.
657 * W32: must not have an .exe suffix.
658 * @param check_suid input true if the binary should be checked for SUID (*nix)
659 * W32: checks if the program has sufficient privileges by executing this
660 * binary with the -d flag. -d omits a programs main loop and only
661 * executes all privileged operations in an binary.
662 * @param params parameters used for w32 privilege checking (can be NULL for != w32, or when not checking for suid/permissions )
663 * @return #GNUNET_YES if the file is SUID (*nix) or can be executed with current privileges (W32),
664 * #GNUNET_NO if not SUID (but binary exists),
665 * #GNUNET_SYSERR on error (no such binary or not executable)
668 GNUNET_OS_check_helper_binary(const char *binary,
673 #if 0 /* keep Emacsens' auto-indent happy */
680 /* ifndef GNUNET_OS_LIB_H */
683 /** @} */ /* end of group */
685 /* end of gnunet_os_lib.h */