/* open/read/write/close */
#include <fcntl.h>
+/* Signals handling.. */
+#include <signal.h>
+
/** If buffer is too small to hold entire string, it is incremented by this value */
#define BUFFER_STEP 16
+/** Buffer used to store line of characters */
+char * buffer = NULL;
+
+/** Named pipe used to communnicate with process2 */
+char * write_pipe = "/tmp/process1pipe";
+
+/** File descriptor of pipe */
+int file_descriptor;
+
+/**
+ * Handler for signals.
+ */
+void sig_handler(int signo)
+{
+ fprintf(stderr, "[%s] Received %s!\n", "process1", strsignal(signo));
+ if (signo == SIGUSR1) {
+ }
+ else if (signo == SIGTERM) {
+ fprintf(stderr, "[%s] > Releasing resources\n", "process1");
+ close(write_pipe);
+ unlink(write_pipe);
+
+ if (buffer) {
+ free(buffer);
+ buffer = NULL;
+ }
+ exit(0);
+ }
+ else if (signo == SIGTSTP) {
+ fprintf(stderr, "[%s] > Closing pipe\n", "process1");
+ close(write_pipe);
+ raise (SIGSTOP);
+ }
+ else if (signo == SIGCONT) {
+ fprintf(stderr, "[%s] > Opening pipe\n", "process1");
+ file_descriptor = open(write_pipe, O_WRONLY);
+ }
+}
+
/**
* Program reads entire lines of text from the standard input and pass them
* to the process2 using created pipe.
/** Currently fetched from stdin character */
int c;
- /** Buffer used to store line of characters */
- char * buffer = NULL;
-
/** Current buffer length*/
int buffer_length = 0;
*/
char * tmp = NULL;
- /** Named pipe used to communnicate with process2 */
- char * fifo = "/tmp/process1fifo";
+ fprintf(stderr, "[%s] Init!\n", "process1");
+
+ /**
+ * Register signals handled by process
+ */
+ if (signal(SIGUSR1, sig_handler) == SIG_ERR) {
+ fprintf(stderr, "can't catch SIGUSR1\n");
+ }
+ if (signal(SIGTERM, sig_handler) == SIG_ERR) {
+ fprintf(stderr, "can't catch SIGTERM\n");
+ }
+ if (signal(SIGTSTP, sig_handler) == SIG_ERR) {
+ fprintf(stderr, "can't catch SIGTSTP\n");
+ }
+ if (signal(SIGCONT, sig_handler) == SIG_ERR) {
+ fprintf(stderr, "can't catch SIGCONT\n");
+ }
- /** File descriptor of pipe */
- int file_descriptor;
+ mkfifo(write_pipe, 0666);
- mkfifo(fifo, 0666);
+ file_descriptor = open(write_pipe, O_WRONLY);
- file_descriptor = open(fifo, O_WRONLY);
-
do {
c = fgetc(stdin);
}
/*
- * If there were no errors parse data.
+ * If there were no errors or it was not just an empty newline:
+ * parse data.
*/
- if (c != EOF) {
+ if (c != EOF || ((i == 0) && (c == 10))) {
/* If newline has been found
* return entire string and release the memory
*/
- if (c == 10) {
+ if (c == 10 && (i != 0)) {
buffer[i] = '\n';
- write(file_descriptor, buffer, ++buffer_length);
- /*fprintf(stdout, "%s\n", buffer);*/
+ write(file_descriptor, buffer, strlen(buffer));
+ fprintf(stderr, "[%s] buffer: %s/%d\n", "process1", buffer, strlen(buffer));
buffer_length = 0;
i = 0;
buffer = tmp;
buffer[i] = c;
- /* Used for debug..*/
+ /* Used only for debugging..*/
/*
printf("c: %c/%d, i: %d, bl: %d\n", c, c, i, buffer_length);
*/
}
} while(c != EOF);
- close(fifo);
- unlink(fifo);
+ /* Release resources in normal program flow exit. */
+ close(write_pipe);
+ unlink(write_pipe);
if (buffer) {
free(buffer);