ref: f3216125def1dbfa242c274f66e13176425fa41e
dir: /sys/src/libdraw/keyboard.c/
#include <u.h> #include <libc.h> #include <draw.h> #include <thread.h> #include <keyboard.h> void closekeyboard(Keyboardctl *kc) { if(kc == nil) return; close(kc->ctlfd); close(kc->consfd); kc->consfd = kc->ctlfd = -1; threadint(kc->pid); } static void _ioproc(void *arg) { int m, n, nerr; char buf[20]; Rune r; Keyboardctl *kc; kc = arg; threadsetname("kbdproc"); n = 0; nerr = 0; while(kc->consfd >= 0){ m = read(kc->consfd, buf+n, sizeof buf-n); if(m <= 0){ yield(); /* if error is due to exiting, we'll exit here */ if(kc->consfd < 0) break; fprint(2, "keyboard: short read: %r\n"); if(m<0 || ++nerr>10) threadexits("read error"); continue; } nerr = 0; n += m; while(n>0 && fullrune(buf, n)){ m = chartorune(&r, buf); n -= m; memmove(buf, buf+m, n); if(send(kc->c, &r) < 0) break; } } chanfree(kc->c); free(kc->file); free(kc); } Keyboardctl* initkeyboard(char *file) { Keyboardctl *kc; char *t; kc = mallocz(sizeof(Keyboardctl), 1); if(kc == nil) return nil; if(file == nil) file = "/dev/cons"; kc->file = strdup(file); kc->consfd = open(file, ORDWR|OCEXEC); t = malloc(strlen(file)+16); if(kc->consfd<0 || t==nil){ Error1: free(kc); return nil; } sprint(t, "%sctl", file); kc->ctlfd = open(t, OWRITE|OCEXEC); if(kc->ctlfd < 0){ fprint(2, "initkeyboard: can't open %s: %r\n", t); Error2: close(kc->consfd); free(t); goto Error1; } if(ctlkeyboard(kc, "rawon") < 0){ fprint(2, "initkeyboard: can't turn on raw mode on %s: %r\n", t); close(kc->ctlfd); goto Error2; } free(t); kc->c = chancreate(sizeof(Rune), 20); kc->pid = proccreate(_ioproc, kc, 4096); return kc; } int ctlkeyboard(Keyboardctl *kc, char *m) { return write(kc->ctlfd, m, strlen(m)); }