लिनक्स/linux-0.01.tar/fs/ioctl.c
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< लिनक्स | linux-0.01.tar
#include <string.h> #include <errno.h> #include <sys/stat.h> #include <linux/sched.h> extern int tty_ioctl(int dev, int cmd, int arg); typedef int (*ioctl_ptr)(int dev,int cmd,int arg); #define NRDEVS ((sizeof (ioctl_table))/(sizeof (ioctl_ptr))) static ioctl_ptr ioctl_table[]={ NULL, /* nodev */ NULL, /* /dev/mem */ NULL, /* /dev/fd */ NULL, /* /dev/hd */ tty_ioctl, /* /dev/ttyx */ tty_ioctl, /* /dev/tty */ NULL, /* /dev/lp */ NULL}; /* named pipes */ int sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg) { struct file * filp; int dev,mode; if (fd >= NR_OPEN || !(filp = current->filp[fd])) return -EBADF; mode=filp->f_inode->i_mode; if (!S_ISCHR(mode) && !S_ISBLK(mode)) return -EINVAL; dev = filp->f_inode->i_zone[0]; if (MAJOR(dev) >= NRDEVS) panic("unknown device for ioctl"); if (!ioctl_table[MAJOR(dev)]) return -ENOTTY; return ioctl_table[MAJOR(dev)](dev,cmd,arg); }