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Annotation of coherent/b/lib/libc/sys/i8086/sbrk.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * libc/sys/i8086/sbrk.c
        !             3:  * sbrk()
        !             4:  * Grow memory in data segment by a specified increment.
        !             5:  */
        !             6: 
        !             7: #include <stdio.h>
        !             8: #include <sys/types.h>
        !             9: #include <sys/malloc.h>
        !            10: 
        !            11: extern char    *brk();
        !            12: extern int     errno;
        !            13: 
        !            14: char *
        !            15: sbrk(incr) unsigned int incr;
        !            16: {
        !            17:        register vaddr_t send, rend;
        !            18:        register int oerrno;
        !            19:        
        !            20:        rend = (vaddr_t)brk(NULL);
        !            21:        if (incr == 0)
        !            22:                return rend;
        !            23:        send = rend + incr;
        !            24:        if (send < rend)
        !            25:                return BADSBRK;
        !            26:        oerrno = errno;
        !            27:        errno = 0;
        !            28:        brk(send);
        !            29:        if (errno)
        !            30:                return BADSBRK;
        !            31:        errno = oerrno;
        !            32:        return rend;
        !            33: }
        !            34: 
        !            35: /* end of libc/sys/i8086/sbrk.c */

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