/*
This file is part of GNUnet.
- (C) 2001, 2002, 2003, 2004, 2005, 2006, 2011 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2011 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
- * @file include/gnunet_os_lib.h
- * @brief low level process routines
* @author Christian Grothoff
* @author Krista Bennett
* @author Gerd Knorr <kraxel@bytesex.org>
* @author Ioana Patrascu
* @author Tzvetan Horozov
* @author Milan
+ *
+ * @file
+ * Low level process routines
+ *
+ * @defgroup os OS library
+ * Low level process routines.
+ *
+ * This code manages child processes. We can communicate with child
+ * processes using signals. Because signals are not supported on W32
+ * and Java (at least not nicely), we can alternatively use a pipe
+ * to send signals to the child processes (if the child process is
+ * a full-blown GNUnet process that supports reading signals from
+ * a pipe, of course). Naturally, this also only works for 'normal'
+ * termination via signals, and not as a replacement for SIGKILL.
+ * Thus using pipes to communicate signals should only be enabled if
+ * the child is a Java process OR if we are on Windoze.
+ *
+ * @{
*/
#ifndef GNUNET_OS_LIB_H
#include "gnunet_configuration_lib.h"
#include "gnunet_scheduler_lib.h"
+
+/**
+ * Flags that determine which of the standard streams
+ * should be inherited by the child process.
+ */
+enum GNUNET_OS_InheritStdioFlags
+{
+
+ /**
+ * No standard streams should be inherited.
+ */
+ GNUNET_OS_INHERIT_STD_NONE = 0,
+
+ /**
+ * When this flag is set, the child process will
+ * inherit stdin of the parent.
+ */
+ GNUNET_OS_INHERIT_STD_IN = 1,
+
+ /**
+ * When this flag is set, the child process will
+ * inherit stdout of the parent.
+ */
+ GNUNET_OS_INHERIT_STD_OUT = 2,
+
+ /**
+ * When this flag is set, the child process will
+ * inherit stderr of the parent.
+ */
+ GNUNET_OS_INHERIT_STD_ERR = 4,
+
+ /**
+ * When these flags are set, the child process will
+ * inherit stdout and stderr of the parent.
+ */
+ GNUNET_OS_INHERIT_STD_OUT_AND_ERR = 6,
+
+ /**
+ * Use this option to have all of the standard streams
+ * (stdin, stdout and stderror) be inherited.
+ */
+ GNUNET_OS_INHERIT_STD_ALL = 7
+};
+
+
/**
* Process information (OS-dependent)
*/
GNUNET_OS_IPK_BINDIR,
/**
- * Return the directory where libraries are installed. (lib/)
+ * Return the directory where libraries are installed. (lib/gnunet/)
*/
GNUNET_OS_IPK_LIBDIR,
/**
- * Return the directory where data is installed (share/)
+ * Return the directory where data is installed (share/gnunet/)
*/
GNUNET_OS_IPK_DATADIR,
GNUNET_OS_IPK_SELF_PREFIX,
/**
- * Return the prefix of the path with application icons.
+ * Return the prefix of the path with application icons (share/icons/).
*/
- GNUNET_OS_IPK_ICONDIR
+ GNUNET_OS_IPK_ICONDIR,
+
+ /**
+ * Return the prefix of the path with documentation files, including the
+ * license (share/doc/gnunet/).
+ */
+ GNUNET_OS_IPK_DOCDIR,
+
+ /**
+ * Return the directory where helper binaries are installed (lib/gnunet/libexec/)
+ */
+ GNUNET_OS_IPK_LIBEXECDIR
};
};
+/**
+ * Project-specific data used to help the OS subsystem
+ * find installation paths.
+ */
+struct GNUNET_OS_ProjectData
+{
+ /**
+ * Name of a library that is installed in the "lib/" directory of
+ * the project, such as "libgnunetutil". Used to locate the
+ * installation by scanning dependencies of the current process.
+ */
+ const char *libname;
+
+ /**
+ * Name of the project that is used in the "libexec" prefix, For
+ * example, "gnunet". Certain helper binaries are then expected to
+ * be installed in "$PREFIX/libexec/gnunet/" and resources in
+ * "$PREFIX/share/gnunet/".
+ */
+ const char *project_dirname;
+
+ /**
+ * Name of a project-specific binary that should be in "$PREFIX/bin/".
+ * Used to determine installation path from $PATH variable.
+ * For example "gnunet-arm". On W32, ".exe" should be omitted.
+ */
+ const char *binary_name;
+
+ /**
+ * Name of an environment variable that can be used to override
+ * installation path detection, for example "GNUNET_PREFIX".
+ */
+ const char *env_varname;
+
+ /**
+ * Alternative name of an environment variable that can be used to
+ * override installation path detection, if "env_varname" is not
+ * set. Again, for example, "GNUNET_PREFIX".
+ */
+ const char *env_varname_alt;
+
+ /**
+ * Name of an environment variable that can be used to override
+ * the location from which default configuration files are loaded
+ * from, for example "GNUNET_BASE_CONFIG".
+ */
+ const char *base_config_varname;
+
+ /**
+ * E-mail address for reporting bugs.
+ */
+ const char *bug_email;
+
+ /**
+ * Project homepage.
+ */
+ const char *homepage;
+
+ /**
+ * Configuration file name (in $XDG_CONFIG_HOME) to use.
+ */
+ const char *config_file;
+
+ /**
+ * Configuration file name to use (if $XDG_CONFIG_HOME is not set).
+ */
+ const char *user_config_file;
+
+};
+
+
+/**
+ * Return default project data used by 'libgnunetutil' for GNUnet.
+ */
+const struct GNUNET_OS_ProjectData *
+GNUNET_OS_project_data_default (void);
+
+
+/**
+ * @return current (actual) project data.
+ */
+const struct GNUNET_OS_ProjectData *
+GNUNET_OS_project_data_get (void);
+
+
+/**
+ * Setup OS subsystem with project data.
+ *
+ * @param pd project data used to determine paths.
+ */
+void
+GNUNET_OS_init (const struct GNUNET_OS_ProjectData *pd);
+
+
/**
* Get the path to a specific GNUnet installation directory or, with
- * GNUNET_OS_IPK_SELF_PREFIX, the current running apps installation
+ * #GNUNET_OS_IPK_SELF_PREFIX, the current running apps installation
* directory.
*
* @param dirkind what kind of directory is desired?
GNUNET_OS_installation_get_path (enum GNUNET_OS_InstallationPathKind dirkind);
+/**
+ * Given the name of a gnunet-helper, gnunet-service or gnunet-daemon
+ * binary, try to prefix it with the libexec/-directory to get the
+ * full path.
+ *
+ * @param progname name of the binary
+ * @return full path to the binary, if possible, otherwise copy of 'progname'
+ */
+char *
+GNUNET_OS_get_libexec_binary_path (const char *progname);
+
+
/**
* Callback function invoked for each interface found.
*
* @param isDefault is this presumably the default interface
* @param addr address of this interface (can be NULL for unknown or unassigned)
* @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
- * @param netmask the network mask (can be NULL for unknown or unassigned))
+ * @param netmask the network mask (can be NULL for unknown or unassigned)
* @param addrlen length of the address
- * @return GNUNET_OK to continue iteration, GNUNET_SYSERR to abort
+ * @return #GNUNET_OK to continue iteration, #GNUNET_SYSERR to abort
*/
-typedef int (*GNUNET_OS_NetworkInterfaceProcessor) (void *cls, const char *name,
- int isDefault,
- const struct sockaddr *
- addr,
- const struct sockaddr *
- broadcast_addr,
- const struct sockaddr *
- netmask, socklen_t addrlen);
+typedef int
+(*GNUNET_OS_NetworkInterfaceProcessor) (void *cls,
+ const char *name,
+ int isDefault,
+ const struct sockaddr *addr,
+ const struct sockaddr *broadcast_addr,
+ const struct sockaddr *netmask,
+ socklen_t addrlen);
/**
* @brief Enumerate all network interfaces
+ *
* @param proc the callback function
- * @param proc_cls closure for proc
+ * @param proc_cls closure for @a proc
*/
void
GNUNET_OS_network_interfaces_list (GNUNET_OS_NetworkInterfaceProcessor proc,
/**
- * Sends sig to the process
+ * Sends a signal to the process
*
* @param proc pointer to process structure
* @param sig signal
* @param proc pointer to process structure
*/
void
-GNUNET_OS_process_close (struct GNUNET_OS_Process *proc);
+GNUNET_OS_process_destroy (struct GNUNET_OS_Process *proc);
+
/**
* Get the pid of the process in question
pid_t
GNUNET_OS_process_get_pid (struct GNUNET_OS_Process *proc);
+
/**
- * Set process priority
+ * Start a process.
*
- * @param proc pointer to process structure
- * @param prio priority value
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ * @param pipe_control should a pipe be used to send signals to the child?
+ * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
+ * @param pipe_stdin pipe to use to send input to child process (or NULL)
+ * @param pipe_stdout pipe to use to get output from child process (or NULL)
+ * @param pipe_stderr pipe to use to get error output from child process (or NULL)
+ * @param filename name of the binary
+ * @param argv NULL-terminated array of arguments to the process
+ * @return pointer to process structure of the new process, NULL on error
*/
-int
-GNUNET_OS_set_process_priority (struct GNUNET_OS_Process *proc,
- enum GNUNET_SCHEDULER_Priority prio);
+struct GNUNET_OS_Process *
+GNUNET_OS_start_process_vap (int pipe_control,
+ enum GNUNET_OS_InheritStdioFlags std_inheritance,
+ struct GNUNET_DISK_PipeHandle *pipe_stdin,
+ struct GNUNET_DISK_PipeHandle *pipe_stdout,
+ struct GNUNET_DISK_PipeHandle *pipe_stderr,
+ const char *filename,
+ char *const argv[]);
/**
* Start a process.
*
+ * @param pipe_control should a pipe be used to send signals to the child?
+ * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
* @param pipe_stdin pipe to use to send input to child process (or NULL)
* @param pipe_stdout pipe to use to get output from child process (or NULL)
+ * @param pipe_stderr pipe to use to get error output from child process (or NULL)
* @param filename name of the binary
* @param ... NULL-terminated list of arguments to the process
* @return pointer to process structure of the new process, NULL on error
*/
struct GNUNET_OS_Process *
-GNUNET_OS_start_process (struct GNUNET_DISK_PipeHandle *pipe_stdin,
+GNUNET_OS_start_process (int pipe_control,
+ enum GNUNET_OS_InheritStdioFlags std_inheritance,
+ struct GNUNET_DISK_PipeHandle *pipe_stdin,
struct GNUNET_DISK_PipeHandle *pipe_stdout,
+ struct GNUNET_DISK_PipeHandle *pipe_stderr,
const char *filename, ...);
/**
* Start a process.
*
+ * @param pipe_control should a pipe be used to send signals to the child?
+ * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
* @param pipe_stdin pipe to use to send input to child process (or NULL)
* @param pipe_stdout pipe to use to get output from child process (or NULL)
+ * @param pipe_stderr pipe to use to get error output from child process (or NULL)
* @param filename name of the binary
* @param va NULL-terminated list of arguments to the process
* @return pointer to process structure of the new process, NULL on error
*/
struct GNUNET_OS_Process *
-GNUNET_OS_start_process_va (struct GNUNET_DISK_PipeHandle *pipe_stdin,
+GNUNET_OS_start_process_va (int pipe_control,
+ enum GNUNET_OS_InheritStdioFlags std_inheritance,
+ struct GNUNET_DISK_PipeHandle *pipe_stdin,
struct GNUNET_DISK_PipeHandle *pipe_stdout,
+ struct GNUNET_DISK_PipeHandle *pipe_stderr,
const char *filename, va_list va);
/**
* Start a process.
*
+ * @param pipe_control should a pipe be used to send signals to the child?
+ * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
* @param lsocks array of listen sockets to dup systemd-style (or NULL);
* must be NULL on platforms where dup is not supported
* @param filename name of the binary
* @return pointer to process structure of the new process, NULL on error
*/
struct GNUNET_OS_Process *
-GNUNET_OS_start_process_v (const SOCKTYPE *lsocks, const char *filename,
+GNUNET_OS_start_process_v (int pipe_control,
+ enum GNUNET_OS_InheritStdioFlags std_inheritance,
+ const SOCKTYPE *lsocks,
+ const char *filename,
char *const argv[]);
+/**
+ * Start a process. This function is similar to the GNUNET_OS_start_process_*
+ * except that the filename and arguments can have whole strings which contain
+ * the arguments. These arguments are to be separated by spaces and are parsed
+ * in the order they appear. Arguments containing spaces can be used by
+ * quoting them with @em ".
+ *
+ * @param pipe_control should a pipe be used to send signals to the child?
+ * @param std_inheritance a set of GNUNET_OS_INHERIT_STD_* flags
+ * @param lsocks array of listen sockets to dup systemd-style (or NULL);
+ * must be NULL on platforms where dup is not supported
+ * @param filename name of the binary. It is valid to have the arguments
+ * in this string when they are separated by spaces.
+ * @param ... more arguments. Should be of type `char *`. It is valid
+ * to have the arguments in these strings when they are separated by
+ * spaces. The last argument MUST be NULL.
+ * @return pointer to process structure of the new process, NULL on error
+ */
+struct GNUNET_OS_Process *
+GNUNET_OS_start_process_s (int pipe_control,
+ unsigned int std_inheritance,
+ const SOCKTYPE * lsocks,
+ const char *filename, ...);
+
+
/**
* Handle to a command action.
*/
struct GNUNET_OS_CommandHandle;
+
/**
* Type of a function to process a line of output.
*
*/
typedef void (*GNUNET_OS_LineProcessor) (void *cls, const char *line);
+
/**
* Stop/kill a command.
*
/**
- * Retrieve the status of a process. Nonblocking version.
+ * Retrieve the status of a process, waiting on him if dead.
+ * Nonblocking version.
*
* @param proc pointer to process structure
* @param type status type
* @param code return code/signal number
- * @return GNUNET_OK on success, GNUNET_NO if the process is still running, GNUNET_SYSERR otherwise
+ * @return #GNUNET_OK on success, #GNUNET_NO if the process is still running, #GNUNET_SYSERR otherwise
*/
int
GNUNET_OS_process_status (struct GNUNET_OS_Process *proc,
/**
* Wait for a process to terminate. The return code is discarded.
- * You must not use 'GNUNET_OS_process_status' on the same process
+ * You must not use #GNUNET_OS_process_status() on the same process
* after calling this function! This function is blocking and should
* thus only be used if the child process is known to have terminated
* or to terminate very soon.
*
* @param proc pointer to process structure of the process to wait for
- * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
*/
int
GNUNET_OS_process_wait (struct GNUNET_OS_Process *proc);
/**
- * Connects this process to its parent via pipe
+ * Connects this process to its parent via pipe;
+ * essentially, the parent control handler will read signal numbers
+ * from the #GNUNET_OS_CONTROL_PIPE (as given in an environment
+ * variable) and raise those signals.
+ *
+ * @param cls closure (unused)
*/
void
-GNUNET_OS_install_parent_control_handler (void *cls,
- const struct
- GNUNET_SCHEDULER_TaskContext *tc);
+GNUNET_OS_install_parent_control_handler (void *cls);
/**
* Attempts to find the file using the current
* PATH environment variable as a search path.
*
- * @param binary the name of the file to check
- * @return GNUNET_YES if the file is SUID,
- * GNUNET_NO if not SUID (but binary exists)
- * GNUNET_SYSERR on error (no such binary or not executable)
+ * @param binary the name of the file to check.
+ * W32: must not have an .exe suffix.
+ * @param check_suid input true if the binary should be checked for SUID (*nix)
+ * W32: checks if the program has sufficient privileges by executing this
+ * binary with the -d flag. -d omits a programs main loop and only
+ * executes all privileged operations in an binary.
+ * @param params parameters used for w32 privilege checking (can be NULL for != w32, or when not checking for suid/permissions )
+ * @return #GNUNET_YES if the file is SUID (*nix) or can be executed with current privileges (W32),
+ * #GNUNET_NO if not SUID (but binary exists),
+ * #GNUNET_SYSERR on error (no such binary or not executable)
*/
int
-GNUNET_OS_check_helper_binary (const char *binary);
+GNUNET_OS_check_helper_binary (const char *binary,
+ int check_suid,
+ const char *params);
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
-
/* ifndef GNUNET_OS_LIB_H */
#endif
+
+/** @} */ /* end of group */
+
/* end of gnunet_os_lib.h */