X-Git-Url: https://git.dlugolecki.net.pl/?a=blobdiff_plain;f=src%2Fprocess3.c;h=b75f903af10e363d5c96d07000fa22609322f025;hb=621bd5704dfeeccf51097ba255010bd37054972c;hp=4568d97d1e3c4ee1280221fbf7f23ef1cd7f57e2;hpb=51faabd1c82aa37c43f6521ae17c47ce62272754;p=wsti_so.git

diff --git a/src/process3.c b/src/process3.c
index 4568d97..b75f903 100644
--- a/src/process3.c
+++ b/src/process3.c
@@ -1,30 +1,75 @@
 #include <stdio.h>
 
+/* exit.. */
+#include <stdlib.h>
+
 /* open/read/write/close */
 #include <fcntl.h>
 
+/* Signals handling.. */
+#include <signal.h>
+
+/** Named pipe used to communicate with process2 */
+char * read_pipe = "/tmp/process2pipe";
+
+/** Descriptor of input pipe */
+int read_descriptor;
+
+/**
+ * Handler for signals.
+ */
+void sig_handler(int signo)
+{
+	fprintf(stderr, "[%s] Received %s!\n", "process3", strsignal(signo));
+	if (signo == SIGUSR1) {
+	}
+	else if (signo == SIGTERM) {
+		fprintf(stderr, "[%s] > Releasing resources\n", "process3");
+		close(read_descriptor);
+		exit(0);
+	}
+	else if (signo == SIGTSTP) {
+		fprintf(stderr, "[%s] > Closing pipe\n", "process3");
+		close(read_descriptor);
+	}
+	else if (signo == SIGCONT) {
+		fprintf(stderr, "[%s] > Opening pipe\n", "process3");
+		read_descriptor = open(read_pipe, O_RDONLY);
+	}
+}
+
 /**
  * Program grabs data (calculated number of characters) from process2 and prints
  * grabbed data to the standard output.
  */
 int main(void) {
-	/** Named pipe used to communicate with process2 */
-	char * read_pipe = "/tmp/process2pipe";
-
-	/** Descriptor of input pipe */
-	int read_descriptor;
-
 	/** Buffer used for storing data from input pipe */
 	int buffer = 0;
 	
 	/** Stores number of bytes read from input pipe in current iteration */
 	ssize_t count = 0;
 
+	fprintf(stderr, "[%s] Init!\n", "process3");
+
+	/**
+	 * 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");
+	}
+
 	/* Reading from process2 */
 	read_descriptor = open(read_pipe, O_RDONLY);
 
-	fprintf(stderr, "[%s] Init!\n", "process3");
-
 	while(1) {
 		/* Read data from input pipe */
 		count = read(read_descriptor, &buffer, sizeof(int));
@@ -39,6 +84,7 @@ int main(void) {
 		}
 	}
 
+	/* Release resources in normal program flow exit. */
 	close(read_descriptor);
 
 	return 0;