init commit

3sem/cnts/contest11/01.c

@@ -0,0 +1,22 @@
+#include <unistd.h>
+#include <sys/types.h>
+#include <wait.h>
+#include <stdio.h>
+
+int
+proc(void)
+{
+    int pid = fork();
+    if (!pid) {
+        write(1, "1\n", 2);
+    }
+    return pid;
+}
+
+int
+main(int argc, char **argv)
+{
+    proc(), proc(), proc();
+
+    return 0;
+}

3sem/cnts/contest11/01_ans.c

@@ -0,0 +1 @@
+proc(), proc(), proc()

3sem/cnts/contest11/02.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <wait.h>
+#include <sys/types.h>
+
+int
+main()
+{
+    pid_t pid;
+    pid = fork();
+    if (!pid) {
+        pid = fork();
+        if (!pid) {
+            printf("3 ");
+
+            return 0;
+        } else if (pid == -1) {
+            return 1;
+        } else {
+            wait(NULL);
+            printf("2 ");
+        }
+        return 0;
+    } else if (pid == -1) {
+        return 1;
+    } else {
+        wait(NULL);
+        printf("1");
+    }
+
+    printf("\n");
+
+    return 0;
+}

3sem/cnts/contest11/03.c

@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+enum
+{
+    MAX_LEN = 8
+};
+
+void
+process_line(int line_number)
+{
+    char buffer[MAX_LEN + 1] = {0};
+    read(0, buffer, sizeof(buffer) - 1);
+    long long number = strtoll(buffer, NULL, 10);
+    long long square = number * number;
+    printf("%d %lld\n", line_number, square);
+
+    return;
+}
+
+int
+main()
+{
+    pid_t pid;
+
+    for (int i = 0; i < 3; i++) {
+        if ((pid = fork()) == 0) {
+            process_line(i + 1);
+            exit(0);
+        }
+    }
+
+    while (wait(NULL) != -1)
+        ;
+
+    return 0;
+}

3sem/cnts/contest11/04

@@ -0,0 +1 @@
+3

3sem/cnts/contest11/04.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+
+int
+main()
+{
+    pid_t pid;
+
+    int n;
+    if (scanf("%d", &n) != 1) {
+        return 1;
+    }
+
+    for (int i = 1; i <= n; i++) {
+        printf("%d", i);
+        fflush(stdout);
+
+        if (i == n) {
+            printf("\n");
+            return 0;
+        } else {
+            printf(" ");
+            fflush(stdout);
+        }
+        pid = fork();
+
+        if (!pid) {
+            continue;
+        } else {
+            wait(NULL);
+            return 0;
+        }
+    }
+
+    return 0;
+}

3sem/cnts/contest11/05

@@ -0,0 +1 @@
+1 2 3

3sem/cnts/contest11/05.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <wait.h>
+#include <sys/types.h>
+
+int
+main()
+{
+
+    pid_t pid;
+    int n;
+
+    pid = fork();
+    if (!pid) {
+        for (;;) {
+            if (scanf("%d", &n) != 1) {
+                return 0;
+            }
+
+            pid = fork();
+            if (!pid) {
+                continue;
+            }
+            int status;
+            wait(&status);
+            if (pid == -1 || !WIFEXITED(status) || WEXITSTATUS(status)) {
+                return -1;
+            }
+
+            printf("%d\n", n);
+            return 0;
+        }
+    } else {
+        int status;
+        wait(&status);
+        if (pid == -1 || !WIFEXITED(status) || WEXITSTATUS(status)) {
+            printf("-1\n");
+        }
+    }
+
+    return 0;
+}