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Annotation of researchv10dc/sys/os/ioctl.c, revision 1.1

1.1     ! root        1: #include "sys/param.h"
        !             2: #include "sys/user.h"
        !             3: #include "sys/inode.h"
        !             4: #include "sys/file.h"
        !             5: #include "sys/conf.h"
        !             6: #include "sys/filio.h"
        !             7: 
        !             8: /*
        !             9:  * ioctl system call
        !            10:  * Check legality, execute common code, and switch out to individual
        !            11:  * device routine.
        !            12:  */
        !            13: ioctl()
        !            14: {
        !            15:        register struct file *fp;
        !            16:        register struct inode *ip;
        !            17:        register struct a {
        !            18:                int     fdes;
        !            19:                int     cmd;
        !            20:                caddr_t cmarg;
        !            21:        } *uap;
        !            22: 
        !            23:        uap = (struct a *)u.u_ap;
        !            24:        if ((fp = getf(uap->fdes)) == NULL
        !            25:        ||  (fp->f_flag & (FREAD|FWRITE)) == 0) {
        !            26:                u.u_error = EBADF;
        !            27:                return;
        !            28:        }
        !            29:        ip = fp->f_inode;
        !            30:        switch (uap->cmd) {
        !            31: 
        !            32:        case FIOCLEX:                   /* close on exec */
        !            33:                u.u_pofile[uap->fdes] |= EXCLOSE;
        !            34:                return;
        !            35: 
        !            36:        case FIONCLEX:                  /* no close on exec */
        !            37:                u.u_pofile[uap->fdes] &= ~EXCLOSE;
        !            38:                return;
        !            39: 
        !            40:        }
        !            41:        if (ip->i_sptr) {
        !            42:                stioctl(ip, uap->cmd, uap->cmarg);
        !            43:                return;
        !            44:        }
        !            45:        (*fstypsw[ip->i_fstyp]->t_ioctl)(ip, uap->cmd, uap->cmarg, fp->f_flag);
        !            46: }

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