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
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 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 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
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
72 * No standard streams should be inherited.
74 GNUNET_OS_INHERIT_STD_NONE = 0,
77 * When this flag is set, the child process will
78 * inherit stdin of the parent.
80 GNUNET_OS_INHERIT_STD_IN = 1,
83 * When this flag is set, the child process will
84 * inherit stdout of the parent.
86 GNUNET_OS_INHERIT_STD_OUT = 2,
89 * When this flag is set, the child process will
90 * inherit stderr of the parent.
92 GNUNET_OS_INHERIT_STD_ERR = 4,
95 * When these flags are set, the child process will
96 * inherit stdout and stderr of the parent.
98 GNUNET_OS_INHERIT_STD_OUT_AND_ERR = 6,
101 * Use this option to have all of the standard streams
102 * (stdin, stdout and stderror) be inherited.
104 GNUNET_OS_INHERIT_STD_ALL = 7
109 * Process information (OS-dependent)
111 struct GNUNET_OS_Process;
115 * Possible installation paths to request
117 enum GNUNET_OS_InstallationPathKind
120 * Return the "PREFIX" directory given to configure.
122 GNUNET_OS_IPK_PREFIX,
125 * Return the directory where the program binaries are installed. (bin/)
127 GNUNET_OS_IPK_BINDIR,
130 * Return the directory where libraries are installed. (lib/gnunet/)
132 GNUNET_OS_IPK_LIBDIR,
135 * Return the directory where data is installed (share/gnunet/)
137 GNUNET_OS_IPK_DATADIR,
140 * Return the directory where translations are installed (share/locale/)
142 GNUNET_OS_IPK_LOCALEDIR,
145 * Return the installation directory of this application, not
146 * the one of the overall GNUnet installation (in case they
149 GNUNET_OS_IPK_SELF_PREFIX,
152 * Return the prefix of the path with application icons (share/icons/).
154 GNUNET_OS_IPK_ICONDIR,
157 * Return the prefix of the path with documentation files, including the
158 * license (share/doc/gnunet/).
160 GNUNET_OS_IPK_DOCDIR,
163 * Return the directory where helper binaries are installed (lib/gnunet/libexec/)
165 GNUNET_OS_IPK_LIBEXECDIR
170 * Process status types
172 enum GNUNET_OS_ProcessStatusType
175 * The process is not known to the OS (or at
176 * least not one of our children).
178 GNUNET_OS_PROCESS_UNKNOWN,
181 * The process is still running.
183 GNUNET_OS_PROCESS_RUNNING,
186 * The process is paused (but could be resumed).
188 GNUNET_OS_PROCESS_STOPPED,
191 * The process exited with a return code.
193 GNUNET_OS_PROCESS_EXITED,
196 * The process was killed by a signal.
198 GNUNET_OS_PROCESS_SIGNALED
203 * Project-specific data used to help the OS subsystem
204 * find installation paths.
206 struct GNUNET_OS_ProjectData
209 * Name of a library that is installed in the "lib/" directory of
210 * the project, such as "libgnunetutil". Used to locate the
211 * installation by scanning dependencies of the current process.
216 * Name of the project that is used in the "libexec" prefix, For
217 * example, "gnunet". Certain helper binaries are then expected to
218 * be installed in "$PREFIX/libexec/gnunet/" and resources in
219 * "$PREFIX/share/gnunet/".
221 const char *project_dirname;
224 * Name of a project-specific binary that should be in "$PREFIX/bin/".
225 * Used to determine installation path from $PATH variable.
226 * For example "gnunet-arm". On W32, ".exe" should be omitted.
228 const char *binary_name;
231 * Name of an environment variable that can be used to override
232 * installation path detection, for example "GNUNET_PREFIX".
234 const char *env_varname;
237 * Alternative name of an environment variable that can be used to
238 * override installation path detection, if "env_varname" is not
239 * set. Again, for example, "GNUNET_PREFIX".
241 const char *env_varname_alt;
247 * Return default project data used by 'libgnunetutil' for GNUnet.
249 const struct GNUNET_OS_ProjectData *
250 GNUNET_OS_project_data_default (void);
254 * Setup OS subsystem with project data.
256 * @param pd project data used to determine paths.
259 GNUNET_OS_init (const struct GNUNET_OS_ProjectData *pd);
263 * Get the path to a specific GNUnet installation directory or, with
264 * #GNUNET_OS_IPK_SELF_PREFIX, the current running apps installation
267 * @param dirkind what kind of directory is desired?
268 * @return a pointer to the dir path (to be freed by the caller)
271 GNUNET_OS_installation_get_path (enum GNUNET_OS_InstallationPathKind dirkind);
275 * Given the name of a gnunet-helper, gnunet-service or gnunet-daemon
276 * binary, try to prefix it with the libexec/-directory to get the
279 * @param progname name of the binary
280 * @return full path to the binary, if possible, otherwise copy of 'progname'
283 GNUNET_OS_get_libexec_binary_path (const char *progname);
287 * Callback function invoked for each interface found.
290 * @param name name of the interface (can be NULL for unknown)
291 * @param isDefault is this presumably the default interface
292 * @param addr address of this interface (can be NULL for unknown or unassigned)
293 * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
294 * @param netmask the network mask (can be NULL for unknown or unassigned)
295 * @param addrlen length of the address
296 * @return #GNUNET_OK to continue iteration, #GNUNET_SYSERR to abort
299 (*GNUNET_OS_NetworkInterfaceProcessor) (void *cls,
302 const struct sockaddr *addr,
303 const struct sockaddr *broadcast_addr,
304 const struct sockaddr *netmask,
309 * @brief Enumerate all network interfaces
311 * @param proc the callback function
312 * @param proc_cls closure for @a proc
315 GNUNET_OS_network_interfaces_list (GNUNET_OS_NetworkInterfaceProcessor proc,
319 * @brief Get maximum string length returned by gethostname()
321 #if HAVE_SYSCONF && defined(_SC_HOST_NAME_MAX)
322 #define GNUNET_OS_get_hostname_max_length() ({ int __sc_tmp = sysconf(_SC_HOST_NAME_MAX); __sc_tmp <= 0 ? 255 : __sc_tmp; })
323 #elif defined(HOST_NAME_MAX)
324 #define GNUNET_OS_get_hostname_max_length() HOST_NAME_MAX
326 #define GNUNET_OS_get_hostname_max_length() 255
331 * Get process structure for current process
333 * The pointer it returns points to static memory location and must not be
336 * @return pointer to the process sturcutre for this process
338 struct GNUNET_OS_Process *
339 GNUNET_OS_process_current (void);
343 * Sends a signal to the process
345 * @param proc pointer to process structure
347 * @return 0 on success, -1 on error
350 GNUNET_OS_process_kill (struct GNUNET_OS_Process *proc, int sig);
354 * Cleans up process structure contents (OS-dependent) and deallocates it
356 * @param proc pointer to process structure
359 GNUNET_OS_process_destroy (struct GNUNET_OS_Process *proc);
363 * Get the pid of the process in question
365 * @param proc the process to get the pid of
367 * @return the current process id
370 GNUNET_OS_process_get_pid (struct GNUNET_OS_Process *proc);
376 * @param pipe_control should a pipe be used to send signals to the child?
377 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
378 * @param pipe_stdin pipe to use to send input to child process (or NULL)
379 * @param pipe_stdout pipe to use to get output from child process (or NULL)
380 * @param pipe_stderr pipe to use to get error output from child process (or NULL)
381 * @param filename name of the binary
382 * @param argv NULL-terminated array of arguments to the process
383 * @return pointer to process structure of the new process, NULL on error
385 struct GNUNET_OS_Process *
386 GNUNET_OS_start_process_vap (int pipe_control,
387 enum GNUNET_OS_InheritStdioFlags std_inheritance,
388 struct GNUNET_DISK_PipeHandle *pipe_stdin,
389 struct GNUNET_DISK_PipeHandle *pipe_stdout,
390 struct GNUNET_DISK_PipeHandle *pipe_stderr,
391 const char *filename,
398 * @param pipe_control should a pipe be used to send signals to the child?
399 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
400 * @param pipe_stdin pipe to use to send input to child process (or NULL)
401 * @param pipe_stdout pipe to use to get output from child process (or NULL)
402 * @param pipe_stderr pipe to use to get error output from child process (or NULL)
403 * @param filename name of the binary
404 * @param ... NULL-terminated list of arguments to the process
405 * @return pointer to process structure of the new process, NULL on error
407 struct GNUNET_OS_Process *
408 GNUNET_OS_start_process (int pipe_control,
409 enum GNUNET_OS_InheritStdioFlags std_inheritance,
410 struct GNUNET_DISK_PipeHandle *pipe_stdin,
411 struct GNUNET_DISK_PipeHandle *pipe_stdout,
412 struct GNUNET_DISK_PipeHandle *pipe_stderr,
413 const char *filename, ...);
419 * @param pipe_control should a pipe be used to send signals to the child?
420 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
421 * @param pipe_stdin pipe to use to send input to child process (or NULL)
422 * @param pipe_stdout pipe to use to get output from child process (or NULL)
423 * @param pipe_stderr pipe to use to get error output from child process (or NULL)
424 * @param filename name of the binary
425 * @param va NULL-terminated list of arguments to the process
426 * @return pointer to process structure of the new process, NULL on error
428 struct GNUNET_OS_Process *
429 GNUNET_OS_start_process_va (int pipe_control,
430 enum GNUNET_OS_InheritStdioFlags std_inheritance,
431 struct GNUNET_DISK_PipeHandle *pipe_stdin,
432 struct GNUNET_DISK_PipeHandle *pipe_stdout,
433 struct GNUNET_DISK_PipeHandle *pipe_stderr,
434 const char *filename, va_list va);
439 * @param pipe_control should a pipe be used to send signals to the child?
440 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
441 * @param lsocks array of listen sockets to dup systemd-style (or NULL);
442 * must be NULL on platforms where dup is not supported
443 * @param filename name of the binary
444 * @param argv NULL-terminated list of arguments to the process,
445 * including the process name as the first argument
446 * @return pointer to process structure of the new process, NULL on error
448 struct GNUNET_OS_Process *
449 GNUNET_OS_start_process_v (int pipe_control,
450 enum GNUNET_OS_InheritStdioFlags std_inheritance,
451 const SOCKTYPE *lsocks,
452 const char *filename,
457 * Start a process. This function is similar to the GNUNET_OS_start_process_*
458 * except that the filename and arguments can have whole strings which contain
459 * the arguments. These arguments are to be separated by spaces and are parsed
460 * in the order they appear. Arguments containing spaces can be used by
461 * quoting them with @em ".
463 * @param pipe_control should a pipe be used to send signals to the child?
464 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
465 * @param lsocks array of listen sockets to dup systemd-style (or NULL);
466 * must be NULL on platforms where dup is not supported
467 * @param filename name of the binary. It is valid to have the arguments
468 * in this string when they are separated by spaces.
469 * @param ... more arguments. Should be of type `char *`. It is valid
470 * to have the arguments in these strings when they are separated by
471 * spaces. The last argument MUST be NULL.
472 * @return pointer to process structure of the new process, NULL on error
474 struct GNUNET_OS_Process *
475 GNUNET_OS_start_process_s (int pipe_control,
476 unsigned int std_inheritance,
477 const SOCKTYPE * lsocks,
478 const char *filename, ...);
482 * Handle to a command action.
484 struct GNUNET_OS_CommandHandle;
488 * Type of a function to process a line of output.
491 * @param line line of output from a command, NULL for the end
493 typedef void (*GNUNET_OS_LineProcessor) (void *cls, const char *line);
497 * Stop/kill a command.
499 * @param cmd handle to the process
502 GNUNET_OS_command_stop (struct GNUNET_OS_CommandHandle *cmd);
506 * Run the given command line and call the given function
507 * for each line of the output.
509 * @param proc function to call for each line of the output
510 * @param proc_cls closure for proc
511 * @param timeout when to time out
512 * @param binary command to run
513 * @param ... arguments to command
514 * @return NULL on error
516 struct GNUNET_OS_CommandHandle *
517 GNUNET_OS_command_run (GNUNET_OS_LineProcessor proc, void *proc_cls,
518 struct GNUNET_TIME_Relative timeout, const char *binary,
523 * Retrieve the status of a process, waiting on him if dead.
524 * Nonblocking version.
526 * @param proc pointer to process structure
527 * @param type status type
528 * @param code return code/signal number
529 * @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
532 GNUNET_OS_process_status (struct GNUNET_OS_Process *proc,
533 enum GNUNET_OS_ProcessStatusType *type,
534 unsigned long *code);
538 * Wait for a process to terminate. The return code is discarded.
539 * You must not use #GNUNET_OS_process_status() on the same process
540 * after calling this function! This function is blocking and should
541 * thus only be used if the child process is known to have terminated
542 * or to terminate very soon.
544 * @param proc pointer to process structure of the process to wait for
545 * @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
548 GNUNET_OS_process_wait (struct GNUNET_OS_Process *proc);
552 * Connects this process to its parent via pipe;
553 * essentially, the parent control handler will read signal numbers
554 * from the #GNUNET_OS_CONTROL_PIPE (as given in an environment
555 * variable) and raise those signals.
557 * @param cls closure (unused)
558 * @param tc scheduler context (unused)
561 GNUNET_OS_install_parent_control_handler (void *cls,
563 GNUNET_SCHEDULER_TaskContext *tc);
567 * Check whether an executable exists and possibly
568 * if the suid bit is set on the file.
569 * Attempts to find the file using the current
570 * PATH environment variable as a search path.
572 * @param binary the name of the file to check.
573 * W32: must not have an .exe suffix.
574 * @param check_suid input true if the binary should be checked for SUID (*nix)
575 * W32: checks if the program has sufficient privileges by executing this
576 * binary with the -d flag. -d omits a programs main loop and only
577 * executes all privileged operations in an binary.
578 * @param params parameters used for w32 privilege checking (can be NULL for != w32, or when not checking for suid/permissions )
579 * @return #GNUNET_YES if the file is SUID (*nix) or can be executed with current privileges (W32),
580 * #GNUNET_NO if not SUID (but binary exists),
581 * #GNUNET_SYSERR on error (no such binary or not executable)
584 GNUNET_OS_check_helper_binary (const char *binary,
589 #if 0 /* keep Emacsens' auto-indent happy */
596 /* ifndef GNUNET_OS_LIB_H */
599 /** @} */ /* end of group */
601 /* end of gnunet_os_lib.h */