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