gpm是Linux console下的滑鼠驅動程式，它主要提供文字模式下的滑鼠事件處理。Linux下文字界面的滑鼠幾乎都是用gpm來處理。
gpm的文件在gpm原始碼的doc目錄中，詳細的說明可參考該目錄中的文件gpm programming guide，此處只提供給您KickStart的一些技巧及一些參考說明。
特別注意到以下的例，需在console下執行，不可在X Window的 Terminal下執行。
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例 : gpm_mouse.c
gpm原始碼中有一個mev.c的程式，主要用來測試滑鼠狀態。事實上，mev.c是個很好的例，本例便是取自mev.c，經過簡化修改而來。
#include
#include
#include
#include
void main(int argc,char **argv)
{
fd_set readset;
Gpm_Event event;
Gpm_Connect conn;
conn.eventMask = ~0;
conn.defaultMask = ~GPM_HARD;
conn.maxMod = 0;
conn.minMod = 0;
if (Gpm_Open(&conn,0)==-1) {
printf("Can not open mouse connection\n");
exit(1);
}
while (1) {
FD_ZERO(&readset);
FD_SET(gpm_fd,&readset);
select(gpm_fd+1,&readset,0,0,0);
if (FD_ISSET(gpm_fd,&readset)) {
if (Gpm_GetEvent(&event)>0) {
printf("mouse: event 0x%02X, at %2i %2i (delta %2i %2i),"
"button %i, modifiers 0x%02X\r\n",
event.type,
event.x,event.y,
event.dx,event.dy,
event.buttons,
event.modifiers
);
}
}
}
while (Gpm_Close());
}
編譯
gcc -o gpm_mouse gpm_mouse.c -lgpm
檢驗結果
mouse: event 0x01, at 15 1 (delta -2 -1),button 0, modifiers 0x00
mouse: event 0x01, at 14 1 (delta -1 0),button 0, modifiers 0x00
mouse: event 0x01, at 13 1 (delta -1 0),button 0, modifiers 0x00
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資料結構
typedef struct Gpm_Connect {
unsigned short eventMask, defaultMask;
unsigned short minMod, maxMod;
int pid;
int vc;
} Gpm_Connect;
enum Gpm_Etype {
GPM_MOVE=1,
GPM_DRAG=2, /* exactly one of the bare ones is active at a time */
GPM_DOWN=4,
GPM_UP= 8,
GPM_SINGLE=16, /* at most one in three is set */
GPM_DOUBLE=32,
GPM_TRIPLE=64, /* WARNING: I depend on the values */
GPM_MFLAG=128, /* motion during click? */
GPM_HARD=256, /* if set in the defaultMask, force an already used event to pass over to another handler */
GPM_ENTER=512, /* enter event, user in Roi's */
GPM_LEAVE=1024 /* leave event, used in Roi's */
};
typedef struct Gpm_Event {
unsigned char buttons, modifiers; /* try to be a multiple of 4 */
unsigned short vc;
short dx, dy, x, y;
enum Gpm_Etype type;
int clicks;
enum Gpm_Margin margin;
} Gpm_Event;
typedef int Gpm_Handler(Gpm_Event *event, void *clientdata);
函數宣告
int Gpm_Open(Gpm_Connect * CONN, int FLAGS);
int Gpm_Close(void);
int Gpm_GetEvent(Gpm_Event * EVENT);
int Gpm_Getc(FILE * fp);
#define Gpm_Getchar() Gpm_Getc(stdin)
int Gpm_Wgetch();
#define Gpm_Getch() (Gpm_Wgetch(NULL))
int Gpm_Repeat (int millisecs);
int Gpm_DrawPointer (int X, int Y, int FD);
int GPM_DRAWPOINTER (Gpm_Event *EPTR;)
int Gpm_FitValuesM (int *X, int *Y, int MARGIN);
int Gpm_FitValues (X,Y);
Gpm_FitEvent (EPTR);
char *Gpm_GetLibVersion (int *where);
char *Gpm_GetServerVersion (int *where);
int Gpm_GetSnapshot (Gpm_Event *ePtr);
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