migration

semester-4/ОС/lb-5/src/calc/op-writer.c

@@ -0,0 +1,54 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "shared.h"
+
+int EXIT_CODE = 0;
+
+int main() {
+  int fd;
+  calc_data *data;
+
+  fd = open(SF_NAME, O_CREAT | O_RDWR, 0666);
+  if (fd == -1) {
+    err(EXIT_FAILURE, "open", __LINE__ - 1);
+    goto exit;
+  }
+
+  if (ftruncate(fd, SF_SIZE) == -1) {
+    err(EXIT_FAILURE, "ftruncate", __LINE__ - 1);
+    goto fd_close;
+  }
+
+  data = (calc_data *)mmap(NULL, SF_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
+                           fd, 0);
+  if (data == MAP_FAILED) {
+    err(EXIT_FAILURE, "mmap", __LINE__ - 1);
+    goto fd_close;
+  }
+
+  while (!(data->ready_flags & 1))
+    spin("Waiting for numbers", 250);
+
+  printf("\rEnter operation (+, -, *, /):   ");
+  if (scanf(" %c", &data->operation) != 1) {
+    err(EXIT_FAILURE, "Getting operation", __LINE__ - 1);
+    goto munmap;
+  }
+
+  __sync_or_and_fetch(&data->ready_flags, 2);
+
+  printf("Operation '%c' is written to the shared memory.\n", data->operation);
+
+munmap:
+  munmap(data, SF_SIZE);
+
+fd_close:
+  close(fd);
+
+exit:
+  return EXIT_CODE;
+}