init commit

3sem/seminars/l7/02.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+int
+main(int argc, char *argv[])
+{
+    int fdin = open(argv[1], O_RDONLY);
+    int fdout = open(argv[2], O_RDWR | O_CREAT, 0666);
+
+    off_t len = lseek(fdin, 0, SEEK_END);
+    char *fin = mmap(NULL, len, PROT_READ, MAP_SHARED, fdin, 0);
+
+    ftruncate(fdout, len);
+    char *fout = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_SHARED, fdout, 0);
+
+    memcpy(fout, fin, len);
+
+    close(fdin);
+    close(fdout);
+    munmap(fin, len);
+    munmap(fout, len);
+
+    return 0;
+}