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dbus/dbus/dbus-sysdeps.h
Simon McVittie b997bf4ee2 Add _dbus_atomic_get implemented in terms of inc, dec 
Reviewed-by: Cosimo Alfarano <cosimo.alfarano@collabora.co.uk>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=38005
2011-07-25 18:15:34 +01:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* dbus-sysdeps.h Wrappers around system/libc features (internal to D-Bus implementation)
*
* Copyright (C) 2002, 2003 Red Hat, Inc.
* Copyright (C) 2003 CodeFactory AB
*
* Licensed under the Academic Free License version 2.1
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifndef DBUS_SYSDEPS_H
#define DBUS_SYSDEPS_H
#include "config.h"
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <dbus/dbus-errors.h>
#include <dbus/dbus-file.h>
#include <dbus/dbus-string.h>
/* this is perhaps bogus, but strcmp() etc. are faster if we use the
* stuff straight out of string.h, so have this here for now.
*/
#include <string.h>
#include <stdarg.h>
/* AIX sys/poll.h does #define events reqevents, and other
* wonderousness, so must include sys/poll before declaring
* DBusPollFD
*/
#ifdef HAVE_POLL
#include <sys/poll.h>
#endif
#ifdef DBUS_WINCE
/* Windows CE lacks some system functions (such as errno and clock).
We bring them in here. */
#include "dbus-sysdeps-wince-glue.h"
#endif
DBUS_BEGIN_DECLS
#ifdef DBUS_WIN
#define _DBUS_PATH_SEPARATOR ";"
#else
#define _DBUS_PATH_SEPARATOR ":"
#endif
/* Forward declarations */
/** An opaque list type */
typedef struct DBusList DBusList;
/** Object that contains a list of credentials such as UNIX or Windows user ID */
typedef struct DBusCredentials DBusCredentials;
/** A wrapper around a pipe descriptor or handle */
typedef struct DBusPipe DBusPipe;
/**
* @addtogroup DBusSysdeps
*
* @{
*/
void _dbus_abort (void) _DBUS_GNUC_NORETURN;
const char* _dbus_getenv (const char *varname);
dbus_bool_t _dbus_setenv (const char *varname,
const char *value);
dbus_bool_t _dbus_clearenv (void);
char ** _dbus_get_environment (void);
/** A process ID */
typedef unsigned long dbus_pid_t;
/** A user ID */
typedef unsigned long dbus_uid_t;
/** A group ID */
typedef unsigned long dbus_gid_t;
/** an invalid PID used to represent an uninitialized dbus_pid_t field */
#define DBUS_PID_UNSET ((dbus_pid_t) -1)
/** an invalid UID used to represent an uninitialized dbus_uid_t field */
#define DBUS_UID_UNSET ((dbus_uid_t) -1)
/** an invalid GID used to represent an uninitialized dbus_gid_t field */
#define DBUS_GID_UNSET ((dbus_gid_t) -1)
/** an appropriate printf format for dbus_pid_t */
#define DBUS_PID_FORMAT "%lu"
/** an appropriate printf format for dbus_uid_t */
#define DBUS_UID_FORMAT "%lu"
/** an appropriate printf format for dbus_gid_t */
#define DBUS_GID_FORMAT "%lu"
/**
* Socket interface
*
* @todo Use for the file descriptors a struct
* - struct DBusSocket{ int d; }; -
* instead of int to get type-safety which
* will be checked by the compiler.
*
*/
dbus_bool_t _dbus_open_tcp_socket (int *fd,
DBusError *error);
dbus_bool_t _dbus_close_socket (int fd,
DBusError *error);
int _dbus_read_socket (int fd,
DBusString *buffer,
int count);
int _dbus_write_socket (int fd,
const DBusString *buffer,
int start,
int len);
int _dbus_write_socket_two (int fd,
const DBusString *buffer1,
int start1,
int len1,
const DBusString *buffer2,
int start2,
int len2);
int _dbus_read_socket_with_unix_fds (int fd,
DBusString *buffer,
int count,
int *fds,
int *n_fds);
int _dbus_write_socket_with_unix_fds (int fd,
const DBusString *buffer,
int start,
int len,
const int *fds,
int n_fds);
int _dbus_write_socket_with_unix_fds_two (int fd,
const DBusString *buffer1,
int start1,
int len1,
const DBusString *buffer2,
int start2,
int len2,
const int *fds,
int n_fds);
dbus_bool_t _dbus_socket_is_invalid (int fd);
int _dbus_connect_tcp_socket (const char *host,
const char *port,
const char *family,
DBusError *error);
int _dbus_connect_tcp_socket_with_nonce (const char *host,
const char *port,
const char *family,
const char *noncefile,
DBusError *error);
int _dbus_listen_tcp_socket (const char *host,
const char *port,
const char *family,
DBusString *retport,
int **fds_p,
DBusError *error);
int _dbus_accept (int listen_fd);
dbus_bool_t _dbus_read_credentials_socket (int client_fd,
DBusCredentials *credentials,
DBusError *error);
dbus_bool_t _dbus_send_credentials_socket (int server_fd,
DBusError *error);
dbus_bool_t _dbus_credentials_add_from_user (DBusCredentials *credentials,
const DBusString *username);
dbus_bool_t _dbus_credentials_add_from_current_process (DBusCredentials *credentials);
dbus_bool_t _dbus_append_user_from_current_process (DBusString *str);
dbus_bool_t _dbus_parse_unix_user_from_config (const DBusString *username,
dbus_uid_t *uid_p);
dbus_bool_t _dbus_parse_unix_group_from_config (const DBusString *groupname,
dbus_gid_t *gid_p);
dbus_bool_t _dbus_unix_groups_from_uid (dbus_uid_t uid,
dbus_gid_t **group_ids,
int *n_group_ids);
dbus_bool_t _dbus_unix_user_is_at_console (dbus_uid_t uid,
DBusError *error);
dbus_bool_t _dbus_unix_user_is_process_owner (dbus_uid_t uid);
dbus_bool_t _dbus_windows_user_is_process_owner (const char *windows_sid);
dbus_bool_t _dbus_append_keyring_directory_for_credentials (DBusString *directory,
DBusCredentials *credentials);
dbus_bool_t _dbus_daemon_is_session_bus_address_published (const char *scope);
dbus_bool_t _dbus_daemon_publish_session_bus_address (const char* address, const char* shm_name);
void _dbus_daemon_unpublish_session_bus_address (void);
dbus_bool_t _dbus_socket_can_pass_unix_fd(int fd);
/** Opaque type representing an atomically-modifiable integer
* that can be used from multiple threads.
*/
typedef struct DBusAtomic DBusAtomic;
/**
* An atomic integer safe to increment or decrement from multiple threads.
*/
struct DBusAtomic
{
#ifdef DBUS_WIN
volatile long value; /**< Value of the atomic integer. */
#else
volatile dbus_int32_t value; /**< Value of the atomic integer. */
#endif
};
/* The value we get from autofoo is in the form of a cpp expression;
* convert that to a conventional defined/undef switch. (We can't get
* the conventional defined/undef because of multiarch builds only running
* ./configure once, on Darwin.) */
#if DBUS_HAVE_ATOMIC_INT_COND
# define DBUS_HAVE_ATOMIC_INT 1
#else
# undef DBUS_HAVE_ATOMIC_INT
#endif
dbus_int32_t _dbus_atomic_inc (DBusAtomic *atomic);
dbus_int32_t _dbus_atomic_dec (DBusAtomic *atomic);
dbus_int32_t _dbus_atomic_get (DBusAtomic *atomic);
/* AIX uses different values for poll */
#ifdef _AIX
/** There is data to read */
#define _DBUS_POLLIN 0x0001
/** There is urgent data to read */
#define _DBUS_POLLPRI 0x0004
/** Writing now will not block */
#define _DBUS_POLLOUT 0x0002
/** Error condition */
#define _DBUS_POLLERR 0x4000
/** Hung up */
#define _DBUS_POLLHUP 0x2000
/** Invalid request: fd not open */
#define _DBUS_POLLNVAL 0x8000
#elif defined(__HAIKU__)
/** There is data to read */
#define _DBUS_POLLIN 0x0001
/** Writing now will not block */
#define _DBUS_POLLOUT 0x0002
/** Error condition */
#define _DBUS_POLLERR 0x0004
/** There is urgent data to read */
#define _DBUS_POLLPRI 0x0020
/** Hung up */
#define _DBUS_POLLHUP 0x0080
/** Invalid request: fd not open */
#define _DBUS_POLLNVAL 0x1000
#else
/** There is data to read */
#define _DBUS_POLLIN 0x0001
/** There is urgent data to read */
#define _DBUS_POLLPRI 0x0002
/** Writing now will not block */
#define _DBUS_POLLOUT 0x0004
/** Error condition */
#define _DBUS_POLLERR 0x0008
/** Hung up */
#define _DBUS_POLLHUP 0x0010
/** Invalid request: fd not open */
#define _DBUS_POLLNVAL 0x0020
#endif
/**
* A portable struct pollfd wrapper.
*/
typedef struct
{
int fd; /**< File descriptor */
short events; /**< Events to poll for */
short revents; /**< Events that occurred */
} DBusPollFD;
int _dbus_poll (DBusPollFD *fds,
int n_fds,
int timeout_milliseconds);
void _dbus_sleep_milliseconds (int milliseconds);
void _dbus_get_current_time (long *tv_sec,
long *tv_usec);
/**
* directory interface
*/
dbus_bool_t _dbus_create_directory (const DBusString *filename,
DBusError *error);
dbus_bool_t _dbus_delete_directory (const DBusString *filename,
DBusError *error);
dbus_bool_t _dbus_concat_dir_and_file (DBusString *dir,
const DBusString *next_component);
dbus_bool_t _dbus_string_get_dirname (const DBusString *filename,
DBusString *dirname);
dbus_bool_t _dbus_path_is_absolute (const DBusString *filename);
dbus_bool_t _dbus_get_standard_session_servicedirs (DBusList **dirs);
dbus_bool_t _dbus_get_standard_system_servicedirs (DBusList **dirs);
dbus_bool_t _dbus_append_system_config_file (DBusString *str);
dbus_bool_t _dbus_append_session_config_file (DBusString *str);
/** Opaque type for reading a directory listing */
typedef struct DBusDirIter DBusDirIter;
DBusDirIter* _dbus_directory_open (const DBusString *filename,
DBusError *error);
dbus_bool_t _dbus_directory_get_next_file (DBusDirIter *iter,
DBusString *filename,
DBusError *error);
void _dbus_directory_close (DBusDirIter *iter);
dbus_bool_t _dbus_check_dir_is_private_to_user (DBusString *dir,
DBusError *error);
void _dbus_fd_set_close_on_exec (intptr_t fd);
const char* _dbus_get_tmpdir (void);
/**
* Random numbers
*/
void _dbus_generate_pseudorandom_bytes_buffer (char *buffer,
int n_bytes);
void _dbus_generate_random_bytes_buffer (char *buffer,
int n_bytes);
dbus_bool_t _dbus_generate_random_bytes (DBusString *str,
int n_bytes);
dbus_bool_t _dbus_generate_random_ascii (DBusString *str,
int n_bytes);
const char* _dbus_error_from_errno (int error_number);
const char* _dbus_error_from_system_errno (void);
void _dbus_set_errno_to_zero (void);
dbus_bool_t _dbus_get_is_errno_nonzero (void);
dbus_bool_t _dbus_get_is_errno_eagain_or_ewouldblock (void);
dbus_bool_t _dbus_get_is_errno_enomem (void);
dbus_bool_t _dbus_get_is_errno_eintr (void);
dbus_bool_t _dbus_get_is_errno_epipe (void);
const char* _dbus_strerror_from_errno (void);
void _dbus_disable_sigpipe (void);
void _dbus_exit (int code) _DBUS_GNUC_NORETURN;
int _dbus_printf_string_upper_bound (const char *format,
va_list args);
/**
* Portable struct with stat() results
*/
typedef struct
{
unsigned long mode; /**< File mode */
unsigned long nlink; /**< Number of hard links */
dbus_uid_t uid; /**< User owning file */
dbus_gid_t gid; /**< Group owning file */
unsigned long size; /**< Size of file */
unsigned long atime; /**< Access time */
unsigned long mtime; /**< Modify time */
unsigned long ctime; /**< Creation time */
} DBusStat;
dbus_bool_t _dbus_stat (const DBusString *filename,
DBusStat *statbuf,
DBusError *error);
dbus_bool_t _dbus_full_duplex_pipe (int *fd1,
int *fd2,
dbus_bool_t blocking,
DBusError *error);
void _dbus_print_backtrace (void);
dbus_bool_t _dbus_become_daemon (const DBusString *pidfile,
DBusPipe *print_pid_pipe,
DBusError *error,
dbus_bool_t keep_umask);
dbus_bool_t _dbus_verify_daemon_user (const char *user);
dbus_bool_t _dbus_change_to_daemon_user (const char *user,
DBusError *error);
dbus_bool_t _dbus_write_pid_to_file_and_pipe (const DBusString *pidfile,
DBusPipe *print_pid_pipe,
dbus_pid_t pid_to_write,
DBusError *error);
dbus_bool_t _dbus_command_for_pid (unsigned long pid,
DBusString *str,
int max_len,
DBusError *error);
/** A UNIX signal handler */
typedef void (* DBusSignalHandler) (int sig);
void _dbus_set_signal_handler (int sig,
DBusSignalHandler handler);
dbus_bool_t _dbus_user_at_console (const char *username,
DBusError *error);
void _dbus_init_system_log (void);
typedef enum {
DBUS_SYSTEM_LOG_INFO,
DBUS_SYSTEM_LOG_SECURITY,
DBUS_SYSTEM_LOG_FATAL
} DBusSystemLogSeverity;
void _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...) _DBUS_GNUC_PRINTF (2, 3);
void _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args);
/* Define DBUS_VA_COPY() to do the right thing for copying va_list variables.
* config.h may have already defined DBUS_VA_COPY as va_copy or __va_copy.
*/
#if !defined (DBUS_VA_COPY)
# if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32))
# define DBUS_VA_COPY(ap1, ap2) (*(ap1) = *(ap2))
# elif defined (DBUS_VA_COPY_AS_ARRAY)
# define DBUS_VA_COPY(ap1, ap2) memcpy ((ap1), (ap2), sizeof (va_list))
# else /* va_list is a pointer */
# define DBUS_VA_COPY(ap1, ap2) ((ap1) = (ap2))
# endif /* va_list is a pointer */
#endif /* !DBUS_VA_COPY */
/**
* Casts a primitive C type to a byte array and then indexes
* a particular byte of the array.
*/
#define _DBUS_BYTE_OF_PRIMITIVE(p, i) \
(((const char*)&(p))[(i)])
/** On x86 there is an 80-bit FPU, and if you do "a == b" it may have a
* or b in an 80-bit register, thus failing to compare the two 64-bit
* doubles for bitwise equality. So this macro compares the two doubles
* bitwise.
*/
#define _DBUS_DOUBLES_BITWISE_EQUAL(a, b) \
(_DBUS_BYTE_OF_PRIMITIVE (a, 0) == _DBUS_BYTE_OF_PRIMITIVE (b, 0) && \
_DBUS_BYTE_OF_PRIMITIVE (a, 1) == _DBUS_BYTE_OF_PRIMITIVE (b, 1) && \
_DBUS_BYTE_OF_PRIMITIVE (a, 2) == _DBUS_BYTE_OF_PRIMITIVE (b, 2) && \
_DBUS_BYTE_OF_PRIMITIVE (a, 3) == _DBUS_BYTE_OF_PRIMITIVE (b, 3) && \
_DBUS_BYTE_OF_PRIMITIVE (a, 4) == _DBUS_BYTE_OF_PRIMITIVE (b, 4) && \
_DBUS_BYTE_OF_PRIMITIVE (a, 5) == _DBUS_BYTE_OF_PRIMITIVE (b, 5) && \
_DBUS_BYTE_OF_PRIMITIVE (a, 6) == _DBUS_BYTE_OF_PRIMITIVE (b, 6) && \
_DBUS_BYTE_OF_PRIMITIVE (a, 7) == _DBUS_BYTE_OF_PRIMITIVE (b, 7))
dbus_bool_t _dbus_get_autolaunch_address (const char *scope,
DBusString *address,
DBusError *error);
dbus_bool_t _dbus_lookup_session_address (dbus_bool_t *supported,
DBusString *address,
DBusError *error);
/** Type representing a universally unique ID
* @todo rename to UUID instead of GUID
*/
typedef union DBusGUID DBusGUID;
dbus_bool_t _dbus_read_local_machine_uuid (DBusGUID *machine_id,
dbus_bool_t create_if_not_found,
DBusError *error);
/**
* Initialize threads as in dbus_threads_init_default(), appropriately
* for the platform.
* @returns #FALSE if no memory
*/
dbus_bool_t _dbus_threads_init_platform_specific (void);
dbus_bool_t _dbus_split_paths_and_append (DBusString *dirs,
const char *suffix,
DBusList **dir_list);
unsigned long _dbus_pid_for_log (void);
/* FIXME move back to dbus-sysdeps-unix.h probably -
* the PID file handling just needs a little more abstraction
* in the bus daemon first.
*/
dbus_pid_t _dbus_getpid (void);
dbus_bool_t _dbus_change_to_daemon_user (const char *user,
DBusError *error);
void _dbus_flush_caches (void);
void _dbus_request_file_descriptor_limit (unsigned int limit);
/*
* replaces the term DBUS_PREFIX in configure_time_path by the
* current dbus installation directory. On unix this function is a noop
*
* @param configure_time_path
* @return real path
*/
const char *
_dbus_replace_install_prefix (const char *configure_time_path);
/** @} */
DBUS_END_DECLS
#ifdef DBUS_WIN
#include "dbus-sysdeps-win.h"
#endif
#endif /* DBUS_SYSDEPS_H */
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