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3 (C) 2001, 2002, 2003, 2004, 2005, 2006, 2011 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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22 * @file include/gnunet_os_lib.h
23 * @brief low level process routines
24 * @author Christian Grothoff
25 * @author Krista Bennett
26 * @author Gerd Knorr <kraxel@bytesex.org>
27 * @author Ioana Patrascu
28 * @author Tzvetan Horozov
31 * This code manages child processes. We can communicate with child
32 * processes using signals. Because signals are not supported on W32
33 * and Java (at least not nicely), we can alternatively use a pipe
34 * to send signals to the child processes (if the child process is
35 * a full-blown GNUnet process that supports reading signals from
36 * a pipe, of course). Naturally, this also only works for 'normal'
37 * termination via signals, and not as a replacement for SIGKILL.
38 * Thus using pipes to communicate signals should only be enabled if
39 * the child is a Java process OR if we are on Windoze.
42 #ifndef GNUNET_OS_LIB_H
43 #define GNUNET_OS_LIB_H
48 #if 0 /* keep Emacsens' auto-indent happy */
53 #include "gnunet_common.h"
54 #include "gnunet_configuration_lib.h"
55 #include "gnunet_scheduler_lib.h"
59 * Flags that determine which of the standard streams
60 * should be inherited by the child process.
62 enum GNUNET_OS_InheritStdioFlags
66 * No standard streams should be inherited.
68 GNUNET_OS_INHERIT_STD_NONE = 0,
71 * When this flag is set, the child process will
72 * inherit stdin of the parent.
74 GNUNET_OS_INHERIT_STD_IN = 1,
77 * When this flag is set, the child process will
78 * inherit stdout of the parent.
80 GNUNET_OS_INHERIT_STD_OUT = 2,
83 * When this flag is set, the child process will
84 * inherit stderr of the parent.
86 GNUNET_OS_INHERIT_STD_ERR = 4,
89 * When these flags are set, the child process will
90 * inherit stdout and stderr of the parent.
92 GNUNET_OS_INHERIT_STD_OUT_AND_ERR = 6,
95 * Use this option to have all of the standard streams
96 * (stdin, stdout and stderror) be inherited.
98 GNUNET_OS_INHERIT_STD_ALL = 7
103 * Process information (OS-dependent)
105 struct GNUNET_OS_Process;
109 * Possible installation paths to request
111 enum GNUNET_OS_InstallationPathKind
114 * Return the "PREFIX" directory given to configure.
116 GNUNET_OS_IPK_PREFIX,
119 * Return the directory where the program binaries are installed. (bin/)
121 GNUNET_OS_IPK_BINDIR,
124 * Return the directory where libraries are installed. (lib/gnunet/)
126 GNUNET_OS_IPK_LIBDIR,
129 * Return the directory where data is installed (share/gnunet/)
131 GNUNET_OS_IPK_DATADIR,
134 * Return the directory where translations are installed (share/locale/)
136 GNUNET_OS_IPK_LOCALEDIR,
139 * Return the installation directory of this application, not
140 * the one of the overall GNUnet installation (in case they
143 GNUNET_OS_IPK_SELF_PREFIX,
146 * Return the prefix of the path with application icons (share/icons/).
148 GNUNET_OS_IPK_ICONDIR,
151 * Return the prefix of the path with documentation files, including the
152 * license (share/doc/gnunet/).
154 GNUNET_OS_IPK_DOCDIR,
157 * Return the directory where helper binaries are installed (lib/gnunet/libexec/)
159 GNUNET_OS_IPK_LIBEXECDIR
164 * Process status types
166 enum GNUNET_OS_ProcessStatusType
169 * The process is not known to the OS (or at
170 * least not one of our children).
172 GNUNET_OS_PROCESS_UNKNOWN,
175 * The process is still running.
177 GNUNET_OS_PROCESS_RUNNING,
180 * The process is paused (but could be resumed).
182 GNUNET_OS_PROCESS_STOPPED,
185 * The process exited with a return code.
187 GNUNET_OS_PROCESS_EXITED,
190 * The process was killed by a signal.
192 GNUNET_OS_PROCESS_SIGNALED
197 * Get the path to a specific GNUnet installation directory or, with
198 * #GNUNET_OS_IPK_SELF_PREFIX, the current running apps installation
201 * @param dirkind what kind of directory is desired?
202 * @return a pointer to the dir path (to be freed by the caller)
205 GNUNET_OS_installation_get_path (enum GNUNET_OS_InstallationPathKind dirkind);
209 * Given the name of a gnunet-helper, gnunet-service or gnunet-daemon
210 * binary, try to prefix it with the libexec/-directory to get the
213 * @param progname name of the binary
214 * @return full path to the binary, if possible, otherwise copy of 'progname'
217 GNUNET_OS_get_libexec_binary_path (const char *progname);
221 * Callback function invoked for each interface found.
224 * @param name name of the interface (can be NULL for unknown)
225 * @param isDefault is this presumably the default interface
226 * @param addr address of this interface (can be NULL for unknown or unassigned)
227 * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
228 * @param netmask the network mask (can be NULL for unknown or unassigned)
229 * @param addrlen length of the address
230 * @return #GNUNET_OK to continue iteration, #GNUNET_SYSERR to abort
232 typedef int (*GNUNET_OS_NetworkInterfaceProcessor) (void *cls,
235 const struct sockaddr *addr,
236 const struct sockaddr *broadcast_addr,
237 const struct sockaddr *netmask,
242 * @brief Enumerate all network interfaces
244 * @param proc the callback function
245 * @param proc_cls closure for @a proc
248 GNUNET_OS_network_interfaces_list (GNUNET_OS_NetworkInterfaceProcessor proc,
252 * @brief Get maximum string length returned by gethostname()
254 #if HAVE_SYSCONF && defined(_SC_HOST_NAME_MAX)
255 #define GNUNET_OS_get_hostname_max_length() ({ int __sc_tmp = sysconf(_SC_HOST_NAME_MAX); __sc_tmp <= 0 ? 255 : __sc_tmp; })
256 #elif defined(HOST_NAME_MAX)
257 #define GNUNET_OS_get_hostname_max_length() HOST_NAME_MAX
259 #define GNUNET_OS_get_hostname_max_length() 255
264 * Get process structure for current process
266 * The pointer it returns points to static memory location and must not be
269 * @return pointer to the process sturcutre for this process
271 struct GNUNET_OS_Process *
272 GNUNET_OS_process_current (void);
276 * Sends a signal to the process
278 * @param proc pointer to process structure
280 * @return 0 on success, -1 on error
283 GNUNET_OS_process_kill (struct GNUNET_OS_Process *proc, int sig);
287 * Cleans up process structure contents (OS-dependent) and deallocates it
289 * @param proc pointer to process structure
292 GNUNET_OS_process_destroy (struct GNUNET_OS_Process *proc);
296 * Get the pid of the process in question
298 * @param proc the process to get the pid of
300 * @return the current process id
303 GNUNET_OS_process_get_pid (struct GNUNET_OS_Process *proc);
309 * @param pipe_control should a pipe be used to send signals to the child?
310 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
311 * @param pipe_stdin pipe to use to send input to child process (or NULL)
312 * @param pipe_stdout pipe to use to get output from child process (or NULL)
313 * @param pipe_stderr pipe to use to get error output from child process (or NULL)
314 * @param filename name of the binary
315 * @param argv NULL-terminated array of arguments to the process
316 * @return pointer to process structure of the new process, NULL on error
318 struct GNUNET_OS_Process *
319 GNUNET_OS_start_process_vap (int pipe_control,
320 enum GNUNET_OS_InheritStdioFlags std_inheritance,
321 struct GNUNET_DISK_PipeHandle *pipe_stdin,
322 struct GNUNET_DISK_PipeHandle *pipe_stdout,
323 struct GNUNET_DISK_PipeHandle *pipe_stderr,
324 const char *filename,
331 * @param pipe_control should a pipe be used to send signals to the child?
332 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
333 * @param pipe_stdin pipe to use to send input to child process (or NULL)
334 * @param pipe_stdout pipe to use to get output from child process (or NULL)
335 * @param pipe_stderr pipe to use to get error output from child process (or NULL)
336 * @param filename name of the binary
337 * @param ... NULL-terminated list of arguments to the process
338 * @return pointer to process structure of the new process, NULL on error
340 struct GNUNET_OS_Process *
341 GNUNET_OS_start_process (int pipe_control,
342 enum GNUNET_OS_InheritStdioFlags std_inheritance,
343 struct GNUNET_DISK_PipeHandle *pipe_stdin,
344 struct GNUNET_DISK_PipeHandle *pipe_stdout,
345 struct GNUNET_DISK_PipeHandle *pipe_stderr,
346 const char *filename, ...);
352 * @param pipe_control should a pipe be used to send signals to the child?
353 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
354 * @param pipe_stdin pipe to use to send input to child process (or NULL)
355 * @param pipe_stdout pipe to use to get output from child process (or NULL)
356 * @param pipe_stderr pipe to use to get error output from child process (or NULL)
357 * @param filename name of the binary
358 * @param va NULL-terminated list of arguments to the process
359 * @return pointer to process structure of the new process, NULL on error
361 struct GNUNET_OS_Process *
362 GNUNET_OS_start_process_va (int pipe_control,
363 enum GNUNET_OS_InheritStdioFlags std_inheritance,
364 struct GNUNET_DISK_PipeHandle *pipe_stdin,
365 struct GNUNET_DISK_PipeHandle *pipe_stdout,
366 struct GNUNET_DISK_PipeHandle *pipe_stderr,
367 const char *filename, va_list va);
372 * @param pipe_control should a pipe be used to send signals to the child?
373 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
374 * @param lsocks array of listen sockets to dup systemd-style (or NULL);
375 * must be NULL on platforms where dup is not supported
376 * @param filename name of the binary
377 * @param argv NULL-terminated list of arguments to the process,
378 * including the process name as the first argument
379 * @return pointer to process structure of the new process, NULL on error
381 struct GNUNET_OS_Process *
382 GNUNET_OS_start_process_v (int pipe_control,
383 enum GNUNET_OS_InheritStdioFlags std_inheritance,
384 const SOCKTYPE *lsocks,
385 const char *filename,
390 * Start a process. This function is similar to the GNUNET_OS_start_process_*
391 * except that the filename and arguments can have whole strings which contain
392 * the arguments. These arguments are to be separated by spaces and are parsed
393 * in the order they appear. Arguments containing spaces can be used by
394 * quoting them with @em ".
396 * @param pipe_control should a pipe be used to send signals to the child?
397 * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
398 * @param lsocks array of listen sockets to dup systemd-style (or NULL);
399 * must be NULL on platforms where dup is not supported
400 * @param filename name of the binary. It is valid to have the arguments
401 * in this string when they are separated by spaces.
402 * @param ... more arguments. Should be of type `char *`. It is valid
403 * to have the arguments in these strings when they are separated by
404 * spaces. The last argument MUST be NULL.
405 * @return pointer to process structure of the new process, NULL on error
407 struct GNUNET_OS_Process *
408 GNUNET_OS_start_process_s (int pipe_control,
409 unsigned int std_inheritance,
410 const SOCKTYPE * lsocks,
411 const char *filename, ...);
415 * Handle to a command action.
417 struct GNUNET_OS_CommandHandle;
421 * Type of a function to process a line of output.
424 * @param line line of output from a command, NULL for the end
426 typedef void (*GNUNET_OS_LineProcessor) (void *cls, const char *line);
430 * Stop/kill a command.
432 * @param cmd handle to the process
435 GNUNET_OS_command_stop (struct GNUNET_OS_CommandHandle *cmd);
439 * Run the given command line and call the given function
440 * for each line of the output.
442 * @param proc function to call for each line of the output
443 * @param proc_cls closure for proc
444 * @param timeout when to time out
445 * @param binary command to run
446 * @param ... arguments to command
447 * @return NULL on error
449 struct GNUNET_OS_CommandHandle *
450 GNUNET_OS_command_run (GNUNET_OS_LineProcessor proc, void *proc_cls,
451 struct GNUNET_TIME_Relative timeout, const char *binary,
456 * Retrieve the status of a process, waiting on him if dead.
457 * Nonblocking version.
459 * @param proc pointer to process structure
460 * @param type status type
461 * @param code return code/signal number
462 * @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
465 GNUNET_OS_process_status (struct GNUNET_OS_Process *proc,
466 enum GNUNET_OS_ProcessStatusType *type,
467 unsigned long *code);
471 * Wait for a process to terminate. The return code is discarded.
472 * You must not use 'GNUNET_OS_process_status' on the same process
473 * after calling this function! This function is blocking and should
474 * thus only be used if the child process is known to have terminated
475 * or to terminate very soon.
477 * @param proc pointer to process structure of the process to wait for
478 * @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
481 GNUNET_OS_process_wait (struct GNUNET_OS_Process *proc);
485 * Connects this process to its parent via pipe;
486 * essentially, the parent control handler will read signal numbers
487 * from the 'GNUNET_OS_CONTROL_PIPE' (as given in an environment
488 * variable) and raise those signals.
490 * @param cls closure (unused)
491 * @param tc scheduler context (unused)
494 GNUNET_OS_install_parent_control_handler (void *cls,
496 GNUNET_SCHEDULER_TaskContext *tc);
500 * Check whether an executable exists and possibly
501 * if the suid bit is set on the file.
502 * Attempts to find the file using the current
503 * PATH environment variable as a search path.
505 * @param binary the name of the file to check.
506 * W32: must not have an .exe suffix.
507 * @param check_suid input true if the binary should be checked for SUID (*nix)
508 * W32: checks if the program has sufficient privileges by executing this
509 * binary with the -d flag. -d omits a programs main loop and only
510 * executes all privileged operations in an binary.
511 * @param params parameters used for w32 privilege checking (can be NULL for != w32, or when not checking for suid/permissions )
512 * @return #GNUNET_YES if the file is SUID (*nix) or can be executed with current privileges (W32),
513 * #GNUNET_NO if not SUID (but binary exists),
514 * #GNUNET_SYSERR on error (no such binary or not executable)
517 GNUNET_OS_check_helper_binary (const char *binary, int check_suid, const char * params);
520 #if 0 /* keep Emacsens' auto-indent happy */
528 /* ifndef GNUNET_OS_LIB_H */
530 /* end of gnunet_os_lib.h */