getc.c File Reference

#include <xinu.h>

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Functions
syscall	getc (did32 descrp)
	デバイスから1Byte読み込むgetc()のextern宣言 More...

Function Documentation

getc()

syscall getc

(

did32

descrp

)

デバイスから1Byte読み込むgetc()のextern宣言

Definition at line 9 of file getc.c.

References devtab, disable(), dentry::dvgetc, isbaddev, restore(), and SYSERR.

Referenced by fgetc(), fgets(), getch(), and xsh_cat().

{
    intmask     mask;       /* Saved interrupt mask     */
    struct dentry   *devptr;    /* Entry in device switch table */
    int32       retval;     /* Value to return to caller    */

    mask = disable();
    if (isbaddev(descrp)) {
        restore(mask);
        return SYSERR;
    }
    devptr = (struct dentry *) &devtab[descrp];
    retval = (*devptr->dvgetc) (devptr);
    restore(mask);
    return retval;
}

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