SysTutorials Posts

sd-daemon, SD_EMERG, SD_ALERT, SD_CRIT, SD_ERR, SD_WARNING, SD_NOTICE, SD_INFO, SD_DEBUG – APIs for new-style daemons Synopsis #include <systemd/sd-daemon.h> pkg-config –cflags –libs libsystemd Description sd-daemon.h provide APIs for new-style daemons, as implemented by the systemd(1) init system. See sd_listen_fds(3), sd_notify(3), sd_booted(3), sd_is_fifo(3), sd_watchdog_enabled(3) for more information about the functions implemented. In addition to these functions, a couple…

SDL_SaveBMP – Save an SDL_Surface as a Windows BMP file. Synopsis #include "SDL.h" int SDL_SaveBMP(SDL_Surface *surface, const char *file); Description Saves the SDL_Surface surface as a Windows BMP file named file. Return Value Returns 0 if successful or -1 if there was an error. See Also SDL_LoadBMP

SDL_ResizeEvent – Window resize event structure Structure Definition typedef struct{ Uint8 type; int w, h; } SDL_ResizeEvent; Structure Data type SDL_VIDEORESIZE w, h New width and height of the window Description SDL_ResizeEvent is a member of the SDL_Event union and is used when an event of type SDL_VIDEORESIZE is reported. When SDL_RESIZABLE is passed as…

SDL_RemoveTimer – Remove a timer which was added with SDL_AddTimer. Synopsis #include "SDL.h" SDL_bool SDL_RemoveTimer(SDL_TimerID id); Description Removes a timer callback previously added with SDL_AddTimer. Return Value Returns a boolean value indicating success. Examples SDL_RemoveTimer(my_timer_id); See Also SDL_AddTimer

SDL_GetCursor – Get the currently active mouse cursor. Synopsis #include "SDL.h" SDL_Cursor *SDL_GetCursor(void); Description Returns the currently active mouse cursor. See Also SDL_SetCursor, SDL_CreateCursor, SDL_ShowCursor

SDL_GetClipRect – Gets the clipping rectangle for a surface. Synopsis #include "SDL.h" void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect); Description Gets the clipping rectangle for a surface. When this surface is the destination of a blit, only the area within the clip rectangle is drawn into. The rectangle pointed to by rect will be filled with the…

SDL_EnableKeyRepeat – Set keyboard repeat rate. Synopsis #include "SDL.h" int SDL_EnableKeyRepeat(int delay, int interval); Description Enables or disables the keyboard repeat rate. delay specifies how long the key must be pressed before it begins repeating, it then repeats at the speed specified by interval. Both delay and interval are expressed in milliseconds. Setting delay to…

SDL_DisplayYUVOverlay – Blit the overlay to the display Synopsis #include "SDL.h" int SDL_DisplayYUVOverlay(SDL_Overlay *overlay, SDL_Rect *dstrect); Description Blit the overlay to the surface specified when it was created. The SDL_Rect structure, dstrect, specifies the position and size of the destination. If the dstrect is a larger or smaller than the overlay then the overlay will…

SDL_DisplayFormatAlpha – Convert a surface to the display format Synopsis #include "SDL.h" SDL_Surface *SDL_DisplayFormatAlpha(SDL_Surface *surface); Description This function takes a surface and copies it to a new surface of the pixel format and colors of the video framebuffer plus an alpha channel, suitable for fast blitting onto the display surface. It calls SDL_ConvertSurface If you…

SDL_DisplayFormat – Convert a surface to the display format Synopsis #include "SDL.h" SDL_Surface *SDL_DisplayFormat(SDL_Surface *surface); Description This function takes a surface and copies it to a new surface of the pixel format and colors of the video framebuffer, suitable for fast blitting onto the display surface. It calls SDL_ConvertSurface If you want to take advantage…

SDL_DestroySemaphore – Destroys a semaphore that was created by SDL_CreateSemaphore. Synopsis #include "SDL.h" #include "SDL_thread.h" void SDL_DestroySemaphore(SDL_sem *sem); Description SDL_DestroySemaphore destroys the semaphore pointed to by sem that was created by SDL_CreateSemaphore. It is not safe to destroy a semaphore if there are threads currently blocked waiting on it. Examples if (my_sem != NULL) {…

SDL_DestroyMutex – Destroy a mutex Synopsis #include "SDL.h" #include "SDL_thread.h" void SDL_DestroyMutex(SDL_mutex *mutex); Description Destroy a previously created mutex. See Also SDL_CreateMutex

SDL_Delay – Wait a specified number of milliseconds before returning. Synopsis #include "SDL.h" void SDL_Delay(Uint32 ms); Description Wait a specified number of milliseconds before returning. SDL_Delay will wait at least the specified time, but possible longer due to OS scheduling. Note: Count on a delay granularity of at least 10 ms. Some platforms have shorter…

SDL_CreateYUVOverlay – Create a YUV video overlay Synopsis #include "SDL.h" SDL_Overlay *SDL_CreateYUVOverlay(int width, int height, Uint32 format, SDL_Surface *display); Description SDL_CreateYUVOverlay creates a YUV overlay of the specified width, height and format (see SDL_Overlay for a list of available formats), for the provided display. A SDL_Overlay structure is returned. The term ‘overlay’ is a misnomer…

SDL_AddTimer – Add a timer which will call a callback after the specified number of milliseconds has elapsed. Synopsis #include "SDL.h" SDL_TimerID SDL_AddTimer(Uint32 interval, SDL_NewTimerCallback callback, void *param); Callback /* type definition for the "new" timer callback function */ typedef Uint32 (*SDL_NewTimerCallback)(Uint32 interval, void *param); Description Adds a callback function to be run after the…

SDL_ActiveEvent – Application visibility event structure Structure Definition typedef struct{ Uint8 type; Uint8 gain; Uint8 state; } SDL_ActiveEvent; Structure Data type SDL_ACTIVEEVENT. gain 0 if the event is a loss or 1 if it is a gain. state SDL_APPMOUSEFOCUS if mouse focus was gained or lost, SDL_APPINPUTFOCUS if input focus was gained or lost, or…

NAME sdisna.f – SYNOPSIS Functions/Subroutines subroutine sdisna (JOB, M, N, D, SEP, INFO) SDISNA Function/Subroutine Documentation subroutine sdisna (characterJOB, integerM, integerN, real, dimension( * )D, real, dimension( * )SEP, integerINFO) SDISNA Purpose: SDISNA computes the reciprocal condition numbers for the eigenvectors of a real symmetric or complex Hermitian matrix or for the left or right…

WFMath – Generic library namespace. Synopsis Classes class AxisBox A dim dimensional axis-aligned box. class Ball A dim dimensional ball. struct ColinearVectors An error thrown by certain functions when passed parallel vectors. struct ParseError An error thrown by operator>>() when it fails to parse wfmath types. class Point A dim dimensional point. class Polygon< 2…

QuantLib::VolatilityTermStructure – Volatility term structure. Synopsis #include <ql/termstructures/voltermstructure.hpp> Inherits QuantLib::TermStructure. Inherited by BlackAtmVolCurve, BlackVolTermStructure, CapFloorTermVolatilityStructure, LocalVolTermStructure, OptionletVolatilityStructure, and SwaptionVolatilityStructure. Public Member Functions virtual BusinessDayConvention businessDayConvention () const the business day convention used in tenor to date conversion Date optionDateFromTenor (const Period &) const period/date conversion virtual Rate minStrike () const =0 the minimum strike for…

QuantLib::SingleAssetOption – Black-Scholes-Merton option. Synopsis #include <ql/legacy/pricers/singleassetoption.hpp> Inherited by DiscreteGeometricASO. Public Member Functions SingleAssetOption (Option::Type type, Real underlying, Real strike, Spread dividendYield, Rate riskFreeRate, Time residualTime, Volatility volatility) virtual void setVolatility (Volatility newVolatility) virtual void setRiskFreeRate (Rate newRate) virtual void setDividendYield (Rate newDividendYield) virtual Real value () const =0 virtual Real delta () const =0…