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1.4 to prod

other/Vova`s Proj/main.c

@@ -0,0 +1,92 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <sys/file.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+int linesWritten = 0;
+
+void signalHandler(int signal)
+{
+    printf("Number of lines written: %d\n", linesWritten);
+}
+
+void writeFile(const char *fileName, int numLines, const char *placeholder)
+{
+    int fd = open(fileName, O_CREAT | O_WRONLY | O_TRUNC, 0666);
+
+    if (fd == -1)
+    {
+        printf("Failed to open the file\n");
+        exit(EXIT_FAILURE);
+    }
+
+    if (flock(fd, LOCK_EX) == -1)
+    {
+        printf("Failed to lock file for exclusive use\n");
+        exit(EXIT_FAILURE);
+    }
+
+    signal(SIGINT, signalHandler);
+
+    // lseek(fd, 0, SEEK_END);
+
+    for (int i = 0; i < numLines; i++)
+    {
+        dprintf(fd, "%s\n", placeholder);
+        linesWritten++;
+
+        usleep(100000);
+    }
+
+    if (flock(fd, LOCK_UN) == -1)
+    {
+        printf("Failed to unlock file\n");
+        exit(EXIT_FAILURE);
+    }
+
+    close(fd);
+}
+
+int main(int argc, char *argv[])
+{
+    if (argc != 4)
+    {
+        printf("Usage: %s <filename> <number of lines> <placeholder>\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+
+    const char *fileName = argv[1];
+    if (strstr(fileName, ".txt") == NULL)
+    {
+        printf("The provided file must be ended with .txt\n");
+        exit(EXIT_FAILURE);
+    }
+
+    int numLines = atoi(argv[2]);
+    if (numLines <= 0)
+    {
+        printf("The number of lines must be a positive integer\n");
+        exit(EXIT_FAILURE);
+    }
+
+    char *placeholder = argv[3];
+    while (*placeholder)
+    {
+        if (!isalnum(*placeholder) && !isspace(*placeholder))
+        {
+            printf("The placeholder must consist of letters and numbers\n");
+            exit(EXIT_FAILURE);
+        }
+        placeholder++;
+    }
+
+    writeFile(fileName, numLines, argv[3]);
+
+    return 0;
+}