📄 sys.c
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/* * indirect driver for controlling tty. */#include "../h/param.h"#include "../h/conf.h"#include "../h/dir.h"#include "../h/user.h"#include "../h/tty.h"#include "../h/proc.h"syopen(dev, flag){ if(u.u_ttyp == NULL) { u.u_error = ENXIO; return; } (*cdevsw[major(u.u_ttyd)].d_open)(u.u_ttyd, flag);}syread(dev){ (*cdevsw[major(u.u_ttyd)].d_read)(u.u_ttyd);}sywrite(dev){ (*cdevsw[major(u.u_ttyd)].d_write)(u.u_ttyd);}sysioctl(dev, cmd, addr, flag)caddr_t addr;{ (*cdevsw[major(u.u_ttyd)].d_ioctl)(u.u_ttyd, cmd, addr, flag);}
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