init commit

3sem/kr16/01-ai.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdint.h>
+
+int
+main()
+{
+    uint64_t num;
+    int free_blocks = 0;
+
+    while (scanf("%lx", &num) != EOF) {
+        for (int i = 0; i < 64; i += 2) {
+            if (((num >> i) & 0x3) == 0x0) {
+                free_blocks++;
+            }
+        }
+    }
+
+    printf("%d\n", free_blocks);
+    return 0;
+}

3sem/kr16/01.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+int
+main(int argc, char **argv)
+{
+    long long unsigned int tmp, res = 0;
+
+    while (scanf("%llu", &tmp) != EOF) {
+        for (int i = 0; i < sizeof(tmp) * 8; i += 2) {
+            if (!((tmp >> i) & 0x3)) {
+                res++;
+            }
+        }
+    }
+
+    printf("%llu\n", res);
+
+    return 0;
+}

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;
+}

3sem/kr16/04.c

@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <signal.h>
+
+volatile unsigned char cell;
+int fd[2];
+
+void
+usr_hndl(int sig)
+{
+    write(fd[1], &cell, 1);
+    kill(getppid(), SIGUSR1);
+
+    return;
+}
+
+void
+usr_hndl1(int sig)
+{
+    read(fd[0], &cell, 1);
+
+    return;
+}
+
+int
+main(int argc, char **argv)
+{
+    pipe(fd);
+
+    pid_t *mas = malloc((argc - 1) * sizeof(pid_t));
+    int n = argc - 1;
+
+    int64_t size = 0;
+    for (int i = 1; i < argc; ++i) {
+        struct stat st;
+        lstat(argv[i], &st);
+        size = st.st_size;
+
+        pid_t pid = fork();
+        if (!pid) {
+            int file = open(argv[i], O_RDONLY);
+            close(fd[0]);
+
+            signal(SIGUSR1, usr_hndl);
+            for (;;) {
+                pause();
+            }
+            _exit(1);
+        }
+        mas[i - 1] = pid;
+    }
+    close(fd[1]);
+
+    signal(SIGUSR1, usr_hndl1);
+    unsigned int adr;
+    while (scanf("%u", &adr) != -1) {
+        kill(mas[adr % n], SIGUSR1);
+    }
+
+    return 0;
+}