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

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

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