45 lines
1015 B
C
45 lines
1015 B
C
#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int main(int argc, char *argv[])
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{
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assert(argc == 3);
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int fd_in = open(argv[1], O_RDONLY);
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assert(fd_in >= 0);
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struct stat st;
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fstat(fd_in, &st);
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// on mappe le fichier source en mémoire
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void *src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd_in, 0);
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assert(src != MAP_FAILED);
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int fd_out = open(argv[2], O_RDWR | O_CREAT | O_TRUNC, 0644);
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assert(fd_out >= 0);
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// on fixe la taille du fichier de sortie
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ftruncate(fd_out, st.st_size);
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// on mappe le fichier destination en mémoire
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void *dst = mmap(NULL, st.st_size, PROT_WRITE, MAP_SHARED, fd_out, 0);
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assert(dst != MAP_FAILED);
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// copie mémoire → mémoire
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memcpy(dst, src, st.st_size);
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// nettoyage
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munmap(src, st.st_size);
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munmap(dst, st.st_size);
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close(fd_in);
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close(fd_out);
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return 0;
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}
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