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Annotation of researchv10no/sys/io/fd.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * file descriptor driver
                      3:  * open(minor n) -> dup of minor n
                      4:  */
                      5: 
                      6: #include "sys/param.h"
                      7: #include "sys/file.h"
                      8: #include "sys/user.h"
                      9: #include "sys/conf.h"
                     10: 
                     11: int fdopen();
                     12: 
                     13: struct cdevsw fdcdev = cdinit(fdopen, nodev, nodev, nodev, nodev);
                     14: 
                     15: fdopen(dev, flag)
                     16: {
                     17:        register struct file *fp;
                     18:        register int ofd;
                     19: 
                     20:        ofd = u.u_r.r_val1;             /* magic knowledge */
                     21:        if (minor(dev) == ofd || (fp = getf(minor(dev))) == NULL) {
                     22:                u.u_error = EBADF;
                     23:                return;
                     24:        }
                     25:        /* now for the naughty part */
                     26:        if ((unsigned)ofd >= NOFILE || u.u_ofile[ofd] == NULL)
                     27:                panic("fdopen");
                     28:        closef(u.u_ofile[ofd]);
                     29:        u.u_ofile[ofd] = fp;
                     30:        fp->f_count++;
                     31: }

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