init commit

3sem/kr16/02.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <wait.h>
+
+int
+main(int argc, char **argv)
+{
+    int fd[2];
+    pipe(fd);
+    pid_t pid = fork();
+    if (!pid) {
+        close(fd[0]);
+        dup2(fd[1], 1);
+        execlp("gpg", "gpg", "-d", "--batch", "--passphrase", argv[2], "--pinentry-mode", "loopback", "--quiet",
+               "--no-tty", "--no-keyring", argv[1], NULL);
+        _exit(1);
+    } else if (pid == -1) {
+        exit(1);
+    }
+    close(fd[1]);
+    wait(NULL);
+
+    dup2(fd[0], 0);
+
+    int tmp;
+    int64_t sum = 0;
+    while (scanf("%d", &tmp) != EOF) {
+        sum += tmp;
+    }
+
+    printf("%ld\n", sum);
+
+    return 0;
+}