rgz-kiri init
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194
kirill/rgz/daemon.c
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194
kirill/rgz/daemon.c
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// fifo_server_daemon.c
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// Демон: читает из FIFO_REQUEST, обрабатывает текст,
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// В КАЖДОЙ СТРОКЕ заменяет пробелом каждый 3-й байт, который НЕ '\n'.
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// '\n' сохраняется и сбрасывает счётчик позиции внутри строки.
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// Пишет результат в FIFO_RESPONSE и дописывает "\nREPLACEMENTS:<n>\n".
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// Логирует ошибки в syslog, игнорирует SIGPIPE (чтобы write() не убивал процесс). [web:21][web:28]
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#include <stdio.h> // fprintf, snprintf
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#include <stdlib.h> // malloc, free, strtoll
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#include <string.h> // strlen, strerror, memset
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#include <unistd.h> // read, write, close, unlink
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#include <fcntl.h> // open, O_RDONLY, O_WRONLY
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#include <sys/types.h> // типы
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#include <sys/stat.h> // mkfifo
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#include <errno.h> // errno
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#include <signal.h> // sigaction, SIGINT, SIGTERM, SIGPIPE
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#include <syslog.h> // syslog, openlog, closelog
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#define FIFO_REQUEST "/tmp/fifo_request"
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#define FIFO_RESPONSE "/tmp/fifo_response"
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#define BUFFER_SIZE 4096
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static volatile sig_atomic_t running = 1;
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static void signal_handler(int sig) {
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(void) sig;
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running = 0;
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}
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// разбор неотрицательного long long
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static long long parse_ll(const char *s) {
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char *end = NULL;
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errno = 0;
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long long v = strtoll(s, &end, 10);
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if (errno != 0 || end == s || *end != '\0' || v < 0) return -1;
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return v;
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}
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// В каждой строке: заменить каждый 3-й НЕ '\n' байт на пробел.
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// Возвращает количество замен.
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static long long process_data(const char *input, size_t input_len,
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char *output, size_t output_size) {
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if (!input || !output || input_len == 0 || output_size == 0) {
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return 0;
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}
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long long replacements = 0;
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size_t out_pos = 0;
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size_t pos_in_line = 0; // считает только не-'\n' байты в текущей строке
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for (size_t i = 0; i < input_len && out_pos < output_size - 1; i++) {
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unsigned char c = (unsigned char) input[i];
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if (c == '\n') {
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output[out_pos++] = '\n';
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pos_in_line = 0;
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continue;
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}
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pos_in_line++;
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if (pos_in_line % 3 == 0) {
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output[out_pos++] = ' ';
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replacements++;
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} else {
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output[out_pos++] = (char) c;
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}
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}
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output[out_pos] = '\0';
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return replacements;
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}
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int main(int argc, char *argv[]) {
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// Аргумент оставлен для совместимости с вашим запуском, но больше не влияет на обработку.
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <ignored_max_replacements>\n", argv[0]);
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return 1;
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}
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long long ignored = parse_ll(argv[1]);
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if (ignored < 0) {
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fprintf(stderr, "ERROR: Invalid argument (must be non-negative integer)\n");
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return 1;
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}
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openlog("fifo_server_daemon", LOG_PID | LOG_NDELAY, LOG_DAEMON);
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syslog(LOG_INFO, "Server started (systemd), arg(ignored)=%lld", ignored); // syslog via openlog/syslog [web:28]
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = signal_handler;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGINT, &sa, NULL);
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sigaction(SIGTERM, &sa, NULL);
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signal(SIGPIPE, SIG_IGN); // игнор SIGPIPE, обработка ошибок через write() [web:21]
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unlink(FIFO_REQUEST);
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unlink(FIFO_RESPONSE);
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if (mkfifo(FIFO_REQUEST, 0666) == -1) {
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syslog(LOG_ERR, "mkfifo request failed: %s", strerror(errno)); // mkfifo creates FIFO special file [web:37]
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closelog();
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return 1;
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}
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if (mkfifo(FIFO_RESPONSE, 0666) == -1) {
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syslog(LOG_ERR, "mkfifo response failed: %s", strerror(errno)); // mkfifo creates FIFO special file [web:37]
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unlink(FIFO_REQUEST);
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closelog();
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return 1;
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}
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syslog(LOG_INFO, "FIFO created: request=%s, response=%s", FIFO_REQUEST, FIFO_RESPONSE);
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while (running) {
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int fd_req = open(FIFO_REQUEST, O_RDONLY);
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// open FIFO for reading can block until writer connects [web:26][web:35]
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if (!running) {
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if (fd_req != -1) close(fd_req);
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break;
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}
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if (fd_req == -1) {
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if (errno == EINTR) continue;
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syslog(LOG_ERR, "open request FIFO failed: %s", strerror(errno));
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break;
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}
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char *input_buffer = (char *) malloc(BUFFER_SIZE);
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char *output_buffer = (char *) malloc(BUFFER_SIZE);
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if (!input_buffer || !output_buffer) {
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syslog(LOG_ERR, "Memory allocation failed");
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close(fd_req);
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free(input_buffer);
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free(output_buffer);
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break;
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}
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ssize_t bytes_read = read(fd_req, input_buffer, BUFFER_SIZE - 1);
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close(fd_req);
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if (!running) {
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free(input_buffer);
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free(output_buffer);
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break;
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}
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if (bytes_read <= 0) {
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free(input_buffer);
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free(output_buffer);
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if (!running) break;
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continue;
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}
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input_buffer[bytes_read] = '\0';
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syslog(LOG_INFO, "Request received: %zd bytes", bytes_read);
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long long replacements =
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process_data(input_buffer, (size_t) bytes_read, output_buffer, BUFFER_SIZE);
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int fd_resp = open(FIFO_RESPONSE, O_WRONLY);
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// open FIFO for writing can block until reader connects [web:26][web:35]
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if (fd_resp == -1) {
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syslog(LOG_ERR, "open response FIFO failed: %s", strerror(errno));
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free(input_buffer);
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free(output_buffer);
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if (!running) break;
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continue;
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}
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size_t output_len = strlen(output_buffer);
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ssize_t bytes_written = write(fd_resp, output_buffer, output_len);
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char trailer[64];
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snprintf(trailer, sizeof(trailer), "\nREPLACEMENTS:%lld\n", replacements);
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if (write(fd_resp, trailer, strlen(trailer)) < 0) {
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syslog(LOG_WARNING, "write replacements trailer failed: %s", strerror(errno));
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}
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close(fd_resp);
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syslog(LOG_INFO, "Response sent: %zd bytes; replacements=%lld",
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bytes_written, replacements);
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free(input_buffer);
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free(output_buffer);
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}
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syslog(LOG_INFO, "Server stopping, cleaning up");
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unlink(FIFO_REQUEST);
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unlink(FIFO_RESPONSE);
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closelog();
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return 0;
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}
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