xserver/include/os.h

/***********************************************************

Copyright 1987, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.

Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of Digital not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/

#ifndef OS_H
#define OS_H

#include "misc.h"
#include <stdarg.h>
#include <stdint.h>
#if defined(HAVE_REALLOCARRAY)
#include <stdlib.h>       /* for reallocarray */
#endif
#include <string.h>
#ifdef MONOTONIC_CLOCK
#include <time.h>
#endif

#define SCREEN_SAVER_ON   0
#define SCREEN_SAVER_OFF  1
#define SCREEN_SAVER_FORCER 2
#define SCREEN_SAVER_CYCLE  3

#ifndef MAX_REQUEST_SIZE
#define MAX_REQUEST_SIZE 65535
#endif

typedef struct _FontPathRec *FontPathPtr;
typedef struct _NewClientRec *NewClientPtr;

#ifndef xnfalloc
#define xnfalloc(size) XNFalloc((unsigned long)(size))
#define xnfcalloc(_num, _size) XNFcallocarray((_num), (_size))
#define xnfrealloc(ptr, size) XNFrealloc((void *)(ptr), (unsigned long)(size))

#define xstrdup(s) Xstrdup(s)
#define xnfstrdup(s) XNFstrdup(s)

#define xallocarray(num, size) reallocarray(NULL, (num), (size))
#define xnfallocarray(num, size) XNFreallocarray(NULL, (num), (size))
#define xnfreallocarray(ptr, num, size) XNFreallocarray((ptr), (num), (size))
#endif

#include <stdio.h>
#include <stdarg.h>

#ifdef DDXBEFORERESET
extern void ddxBeforeReset(void);
#endif

extern _X_EXPORT Bool WaitForSomething(Bool clients_are_ready);

extern _X_EXPORT int ReadRequestFromClient(ClientPtr /*client */ );

extern _X_EXPORT int ReadFdFromClient(ClientPtr client);

extern _X_EXPORT int WriteFdToClient(ClientPtr client, int fd, Bool do_close);

extern _X_EXPORT Bool InsertFakeRequest(ClientPtr /*client */ ,
                                        char * /*data */ ,
                                        int /*count */ );

extern _X_EXPORT void ResetCurrentRequest(ClientPtr /*client */ );

extern _X_EXPORT void FlushAllOutput(void);

extern _X_EXPORT void FlushIfCriticalOutputPending(void);

extern _X_EXPORT void SetCriticalOutputPending(void);

extern _X_EXPORT int WriteToClient(ClientPtr /*who */ , int /*count */ ,
                                   const void * /*buf */ );

extern _X_EXPORT void ResetOsBuffers(void);

extern _X_EXPORT void NotifyParentProcess(void);

extern _X_EXPORT void CreateWellKnownSockets(void);

extern _X_EXPORT void ResetWellKnownSockets(void);

extern _X_EXPORT void CloseWellKnownConnections(void);

extern _X_EXPORT XID AuthorizationIDOfClient(ClientPtr /*client */ );

extern _X_EXPORT const char *ClientAuthorized(ClientPtr /*client */ ,
                                              unsigned int /*proto_n */ ,
                                              char * /*auth_proto */ ,
                                              unsigned int /*string_n */ ,
                                              char * /*auth_string */ );

extern _X_EXPORT void CloseDownConnection(ClientPtr /*client */ );

typedef void (*NotifyFdProcPtr)(int fd, int ready, void *data);

#define X_NOTIFY_NONE   0x0
#define X_NOTIFY_READ   0x1
#define X_NOTIFY_WRITE  0x2
#define X_NOTIFY_ERROR  0x4     /* don't need to select for, always reported */

extern _X_EXPORT Bool SetNotifyFd(int fd, NotifyFdProcPtr notify_fd, int mask, void *data);

static inline void RemoveNotifyFd(int fd)
{
    (void) SetNotifyFd(fd, NULL, X_NOTIFY_NONE, NULL);
}

extern _X_EXPORT int OnlyListenToOneClient(ClientPtr /*client */ );

extern _X_EXPORT void ListenToAllClients(void);

extern _X_EXPORT void IgnoreClient(ClientPtr /*client */ );

extern _X_EXPORT void AttendClient(ClientPtr /*client */ );

extern _X_EXPORT void MakeClientGrabImpervious(ClientPtr /*client */ );

extern _X_EXPORT void MakeClientGrabPervious(ClientPtr /*client */ );

extern _X_EXPORT void ListenOnOpenFD(int /* fd */ , int /* noxauth */ );

extern _X_EXPORT Bool AddClientOnOpenFD(int /* fd */ );

#ifdef MONOTONIC_CLOCK
extern void ForceClockId(clockid_t /* forced_clockid */);
#endif

extern _X_EXPORT CARD32 GetTimeInMillis(void);
extern _X_EXPORT CARD64 GetTimeInMicros(void);

extern _X_EXPORT void AdjustWaitForDelay(void *waitTime, int newdelay);

typedef struct _OsTimerRec *OsTimerPtr;

typedef CARD32 (*OsTimerCallback) (OsTimerPtr timer,
                                   CARD32 time,
                                   void *arg);

#define TimerAbsolute (1<<0)
#define TimerForceOld (1<<1)

extern _X_EXPORT OsTimerPtr TimerSet(OsTimerPtr timer,
                                     int flags,
                                     CARD32 millis,
                                     OsTimerCallback func,
                                     void *arg);

extern _X_EXPORT void TimerCheck(void);
extern _X_EXPORT void TimerCancel(OsTimerPtr /* pTimer */ );
extern _X_EXPORT void TimerFree(OsTimerPtr /* pTimer */ );

extern _X_EXPORT void SetScreenSaverTimer(void);
extern _X_EXPORT void FreeScreenSaverTimer(void);

extern _X_EXPORT void GiveUp(int /*sig */ );

/*
 * This function malloc(3)s buffer, terminating the server if there is not
 * enough memory.
 */
extern _X_EXPORT void *
XNFalloc(unsigned long /*amount */ );

/*
 * This function calloc(3)s buffer, terminating the server if there is not
 * enough memory.
 */
extern _X_EXPORT void *
XNFcalloc(unsigned long /*amount */ ) _X_DEPRECATED;

/*
 * This function calloc(3)s buffer, terminating the server if there is not
 * enough memory or the arguments overflow when multiplied
 */
extern _X_EXPORT void *
XNFcallocarray(size_t nmemb, size_t size);

/*
 * This function realloc(3)s passed buffer, terminating the server if there is
 * not enough memory.
 */
extern _X_EXPORT void *
XNFrealloc(void * /*ptr */ , unsigned long /*amount */ );

/*
 * This function reallocarray(3)s passed buffer, terminating the server if
 * there is not enough memory or the arguments overflow when multiplied.
 */
extern _X_EXPORT void *
XNFreallocarray(void *ptr, size_t nmemb, size_t size);

/*
 * This function strdup(3)s passed string. The only difference from the library
 * function that it is safe to pass NULL, as NULL will be returned.
 */
extern _X_EXPORT char *
Xstrdup(const char *s);

/*
 * This function strdup(3)s passed string, terminating the server if there is
 * not enough memory. If NULL is passed to this function, NULL is returned.
 */
extern _X_EXPORT char *
XNFstrdup(const char *s);

/* Include new X*asprintf API */
#include "Xprintf.h"

/* Older api deprecated in favor of the asprintf versions */
extern _X_EXPORT char *
Xprintf(const char *fmt, ...)
_X_ATTRIBUTE_PRINTF(1, 2)
    _X_DEPRECATED;
extern _X_EXPORT char *
Xvprintf(const char *fmt, va_list va)
_X_ATTRIBUTE_PRINTF(1, 0)
    _X_DEPRECATED;
extern _X_EXPORT char *
XNFprintf(const char *fmt, ...)
_X_ATTRIBUTE_PRINTF(1, 2)
    _X_DEPRECATED;
extern _X_EXPORT char *
XNFvprintf(const char *fmt, va_list va)
_X_ATTRIBUTE_PRINTF(1, 0)
    _X_DEPRECATED;

typedef void (*OsSigHandlerPtr) (int /* sig */ );
typedef int (*OsSigWrapperPtr) (int /* sig */ );

extern _X_EXPORT OsSigHandlerPtr
OsSignal(int /* sig */ , OsSigHandlerPtr /* handler */ );
extern _X_EXPORT OsSigWrapperPtr
OsRegisterSigWrapper(OsSigWrapperPtr newWrap);

extern _X_EXPORT void
LockServer(void);
extern _X_EXPORT void
UnlockServer(void);

extern _X_EXPORT void
OsInit(void);

extern _X_EXPORT void
OsCleanup(Bool);

extern _X_EXPORT void
OsVendorFatalError(const char *f, va_list args)
_X_ATTRIBUTE_PRINTF(1, 0);

extern _X_EXPORT void
OsVendorInit(void);

extern _X_EXPORT void
OsBlockSignals(void);

extern _X_EXPORT void
OsReleaseSignals(void);

extern void
OsResetSignals(void);

extern _X_EXPORT void
OsAbort(void)
    _X_NORETURN;

extern _X_EXPORT Bool
PrivsElevated(void);

extern _X_EXPORT int
GetClientFd(ClientPtr);

extern _X_EXPORT Bool
ClientIsLocal(ClientPtr client);

extern _X_EXPORT int
ddxProcessArgument(int /*argc */ , char * /*argv */ [], int /*i */ );

extern _X_EXPORT void
ddxUseMsg(void);

/* stuff for ReplyCallback */
extern _X_EXPORT CallbackListPtr ReplyCallback;
typedef struct {
    ClientPtr client;
    const void *replyData;
    unsigned long dataLenBytes; /* actual bytes from replyData + pad bytes */
    unsigned long bytesRemaining;
    Bool startOfReply;
    unsigned long padBytes;     /* pad bytes from zeroed array */
} ReplyInfoRec;

/* stuff for FlushCallback */
extern _X_EXPORT CallbackListPtr FlushCallback;

enum ExitCode {
    EXIT_NO_ERROR = 0,
    EXIT_ERR_ABORT = 1,
    EXIT_ERR_CONFIGURE = 2,
    EXIT_ERR_DRIVERS = 3,
};

extern _X_EXPORT void
ddxGiveUp(enum ExitCode error);
extern _X_EXPORT void
ddxInputThreadInit(void);
extern _X_EXPORT int
TimeSinceLastInputEvent(void);

/* Function fallbacks provided by AC_REPLACE_FUNCS in configure.ac */

#ifndef HAVE_REALLOCARRAY
#define reallocarray xreallocarray
extern _X_EXPORT void *
reallocarray(void *optr, size_t nmemb, size_t size);
#endif

#ifndef HAVE_STRCASECMP
#define strcasecmp xstrcasecmp
extern _X_EXPORT int
xstrcasecmp(const char *s1, const char *s2);
#endif

#ifndef HAVE_STRNCASECMP
#define strncasecmp xstrncasecmp
extern _X_EXPORT int
xstrncasecmp(const char *s1, const char *s2, size_t n);
#endif

#ifndef HAVE_STRCASESTR
#define strcasestr xstrcasestr
extern _X_EXPORT char *
xstrcasestr(const char *s, const char *find);
#endif

#ifndef HAVE_STRLCPY
extern _X_EXPORT size_t
strlcpy(char *dst, const char *src, size_t siz);
extern _X_EXPORT size_t
strlcat(char *dst, const char *src, size_t siz);
#endif

#ifndef HAVE_STRNDUP
extern _X_EXPORT char *
strndup(const char *str, size_t n);
#endif

#ifndef HAVE_TIMINGSAFE_MEMCMP
extern _X_EXPORT int
timingsafe_memcmp(const void *b1, const void *b2, size_t len);
#endif

/* Logging. */
typedef enum _LogParameter {
    XLOG_FLUSH,
    XLOG_SYNC,
    XLOG_VERBOSITY,
    XLOG_FILE_VERBOSITY
} LogParameter;

/* Flags for log messages. */
typedef enum {
    X_PROBED,                   /* Value was probed */
    X_CONFIG,                   /* Value was given in the config file */
    X_DEFAULT,                  /* Value is a default */
    X_CMDLINE,                  /* Value was given on the command line */
    X_NOTICE,                   /* Notice */
    X_ERROR,                    /* Error message */
    X_WARNING,                  /* Warning message */
    X_INFO,                     /* Informational message */
    X_NONE,                     /* No prefix */
    X_NOT_IMPLEMENTED,          /* Not implemented */
    X_DEBUG,                    /* Debug message */
    X_UNKNOWN = -1              /* unknown -- this must always be last */
} MessageType;

extern _X_EXPORT const char *
LogInit(const char *fname, const char *backup);
extern void
LogSetDisplay(void);
extern _X_EXPORT void
LogClose(enum ExitCode error);
extern _X_EXPORT Bool
LogSetParameter(LogParameter param, int value);
extern _X_EXPORT void
LogVWrite(int verb, const char *f, va_list args)
_X_ATTRIBUTE_PRINTF(2, 0);
extern _X_EXPORT void
LogWrite(int verb, const char *f, ...)
_X_ATTRIBUTE_PRINTF(2, 3);
extern _X_EXPORT void
LogVMessageVerb(MessageType type, int verb, const char *format, va_list args)
_X_ATTRIBUTE_PRINTF(3, 0);
extern _X_EXPORT void
LogMessageVerb(MessageType type, int verb, const char *format, ...)
_X_ATTRIBUTE_PRINTF(3, 4);
extern _X_EXPORT void
LogMessage(MessageType type, const char *format, ...)
_X_ATTRIBUTE_PRINTF(2, 3);
extern _X_EXPORT void
LogMessageVerbSigSafe(MessageType type, int verb, const char *format, ...)
_X_ATTRIBUTE_PRINTF(3, 4);
extern _X_EXPORT void
LogVMessageVerbSigSafe(MessageType type, int verb, const char *format, va_list args)
_X_ATTRIBUTE_PRINTF(3, 0);

extern _X_EXPORT void
LogVHdrMessageVerb(MessageType type, int verb,
                   const char *msg_format, va_list msg_args,
                   const char *hdr_format, va_list hdr_args)
_X_ATTRIBUTE_PRINTF(3, 0)
_X_ATTRIBUTE_PRINTF(5, 0);
extern _X_EXPORT void
LogHdrMessageVerb(MessageType type, int verb,
                  const char *msg_format, va_list msg_args,
                  const char *hdr_format, ...)
_X_ATTRIBUTE_PRINTF(3, 0)
_X_ATTRIBUTE_PRINTF(5, 6);
extern _X_EXPORT void
LogHdrMessage(MessageType type, const char *msg_format,
              va_list msg_args, const char *hdr_format, ...)
_X_ATTRIBUTE_PRINTF(2, 0)
_X_ATTRIBUTE_PRINTF(4, 5);

extern _X_EXPORT void
FatalError(const char *f, ...)
_X_ATTRIBUTE_PRINTF(1, 2)
    _X_NORETURN;

#ifdef DEBUG
#define DebugF ErrorF
#else
#define DebugF(...)             /* */
#endif

extern _X_EXPORT void
VErrorF(const char *f, va_list args)
_X_ATTRIBUTE_PRINTF(1, 0);
extern _X_EXPORT void
ErrorF(const char *f, ...)
_X_ATTRIBUTE_PRINTF(1, 2);
extern _X_EXPORT void
VErrorFSigSafe(const char *f, va_list args)
_X_ATTRIBUTE_PRINTF(1, 0);
extern _X_EXPORT void
ErrorFSigSafe(const char *f, ...)
_X_ATTRIBUTE_PRINTF(1, 2);
extern _X_EXPORT void
LogPrintMarkers(void);

extern _X_EXPORT void
xorg_backtrace(void);

#include <signal.h>

#if defined(WIN32) && !defined(__CYGWIN__)
typedef _sigset_t sigset_t;
#endif

#endif                          /* OS_H */