mirror of https://gitee.com/openkylin/linux.git
26 lines
566 B
C
26 lines
566 B
C
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/*
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* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <linux/mman.h>
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#include <asm/unistd.h>
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static int errno;
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static inline _syscall2(int,munmap,void *,start,size_t,len)
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static inline _syscall6(void *,mmap2,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset)
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int switcheroo(int fd, int prot, void *from, void *to, int size)
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{
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if(munmap(to, size) < 0){
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return(-1);
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}
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if(mmap2(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) != to){
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return(-1);
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}
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if(munmap(from, size) < 0){
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return(-1);
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}
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return(0);
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}
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