47 lines
971 B
C
47 lines
971 B
C
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/* $NetBSD: mmap.c,v 1.1.1.2 2008/05/18 14:29:38 aymeric Exp $ */
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#include "config.h"
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#include <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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/*
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* This function fakes mmap() by reading `len' bytes from the file descriptor
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* `fd' and returning a pointer to that memory. The "mapped" region can later
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* be deallocated with munmap().
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*
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* Note: ONLY reading is supported and only reading of the exact size of the
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* file will work.
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*
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* PUBLIC: #ifndef HAVE_MMAP
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* PUBLIC: char *mmap __P((char *, size_t, int, int, int, off_t));
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* PUBLIC: #endif
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*/
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char *
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mmap(char *addr, size_t len, int prot, int flags, int fd, off_t off)
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{
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char *ptr;
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if ((ptr = (char *)malloc(len)) == 0)
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return ((char *)-1);
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if (read(fd, ptr, len) < 0) {
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free(ptr);
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return ((char *)-1);
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}
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return (ptr);
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}
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/*
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* PUBLIC: #ifndef HAVE_MMAP
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* PUBLIC: int munmap __P((char *, size_t));
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* PUBLIC: #endif
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*/
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int
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munmap(char *addr, size_t len)
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{
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free(addr);
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return (0);
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}
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