.

Fichiers/ex2/copy_mmap.c

@@ -0,0 +1,44 @@
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char *argv[])
+{
+    assert(argc == 3);
+
+    int fd_in = open(argv[1], O_RDONLY);
+    assert(fd_in >= 0);
+
+    struct stat st;
+    fstat(fd_in, &st);
+
+    // on mappe le fichier source en mémoire
+    void *src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd_in, 0);
+    assert(src != MAP_FAILED);
+
+    int fd_out = open(argv[2], O_RDWR | O_CREAT | O_TRUNC, 0644);
+    assert(fd_out >= 0);
+
+    // on fixe la taille du fichier de sortie
+    ftruncate(fd_out, st.st_size);
+
+    // on mappe le fichier destination en mémoire
+    void *dst = mmap(NULL, st.st_size, PROT_WRITE, MAP_SHARED, fd_out, 0);
+    assert(dst != MAP_FAILED);
+
+    // copie mémoire → mémoire
+    memcpy(dst, src, st.st_size);
+
+    // nettoyage
+    munmap(src, st.st_size);
+    munmap(dst, st.st_size);
+    close(fd_in);
+    close(fd_out);
+
+    return 0;
+}