From: Rafał Długołęcki <rafal@dlugolecki.net.pl>
Date: Fri, 20 Jun 2014 23:33:38 +0000 (+0200)
Subject: Added signal handlers for all processes.
X-Git-Url: https://git.dlugolecki.net.pl/?a=commitdiff_plain;h=c0975e5a6af7b478563193dac7c3484b4430d3a3;p=wsti_so.git

Added signal handlers for all processes.
---

diff --git a/src/process1.c b/src/process1.c
index d514b03..b500483 100644
--- a/src/process1.c
+++ b/src/process1.c
@@ -5,9 +5,31 @@
 /* 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
 
+/**
+ * Handler for signals.
+ */
+void sig_handler(int signo)
+{
+	if (signo == SIGUSR1) {
+		fprintf(stderr, "[%s] SIGUSR1!\n", "process1");
+	}
+	else if (signo == SIGUSR2) {
+		fprintf(stderr, "[%s] SIGUSR2!\n", "process1");
+	}
+	else if (signo == SIGINT) {
+		fprintf(stderr, "[%s] SIGINT!\n", "process1");
+	}
+	else if (signo == SIGCONT) {
+		fprintf(stderr, "[%s] SIGCONT!\n", "process1");
+	}
+}
+
 /**
  * Program reads entire lines of text from the standard input and pass them
  * to the process2 using created pipe.
@@ -37,12 +59,28 @@ int main(void) {
 	/** File descriptor of pipe */
 	int file_descriptor;
 
+	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(SIGUSR2, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGUSR2\n");
+	}
+	if (signal(SIGINT, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGINT\n");
+	}
+	if (signal(SIGCONT, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGCONT\n");
+	}
+
 	mkfifo(write_pipe, 0666);
 
 	file_descriptor = open(write_pipe, O_WRONLY);
 
-	fprintf(stderr, "[%s] Init!\n", "process1");
-
 	do {
 		c = fgetc(stdin);
 
diff --git a/src/process2.c b/src/process2.c
index b6dff4b..7ae70ff 100644
--- a/src/process2.c
+++ b/src/process2.c
@@ -3,9 +3,31 @@
 /* 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
 
+/**
+ * Handler for signals.
+ */
+void sig_handler(int signo)
+{
+	if (signo == SIGUSR1) {
+		fprintf(stderr, "[%s] SIGUSR1!\n", "process1");
+	}
+	else if (signo == SIGUSR2) {
+		fprintf(stderr, "[%s] SIGUSR2!\n", "process1");
+	}
+	else if (signo == SIGINT) {
+		fprintf(stderr, "[%s] SIGINT!\n", "process1");
+	}
+	else if (signo == SIGCONT) {
+		fprintf(stderr, "[%s] SIGCONT!\n", "process1");
+	}
+}
+
 /**
  * Program grabs data from process1, calculates number of characters in each line
  * and pass the value to process3.
@@ -48,6 +70,22 @@ int main(void) {
 
 	fprintf(stderr, "[%s] Init!\n", "process2");
 
+	/**
+	 * Register signals handled by process
+	 */
+	if (signal(SIGUSR1, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGUSR1\n");
+	}
+	if (signal(SIGUSR2, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGUSR2\n");
+	}
+	if (signal(SIGINT, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGINT\n");
+	}
+	if (signal(SIGCONT, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGCONT\n");
+	}
+
 	while(1) {
 		/* Read data from input pipe */
 		count = read(read_descriptor, buffer, BUFFER_STEP);
diff --git a/src/process3.c b/src/process3.c
index 4568d97..8b4f826 100644
--- a/src/process3.c
+++ b/src/process3.c
@@ -3,6 +3,28 @@
 /* open/read/write/close */
 #include <fcntl.h>
 
+/* Signals handling.. */
+#include <signal.h>
+
+/**
+ * Handler for signals.
+ */
+void sig_handler(int signo)
+{
+	if (signo == SIGUSR1) {
+		fprintf(stderr, "[%s] SIGUSR1!\n", "process1");
+	}
+	else if (signo == SIGUSR2) {
+		fprintf(stderr, "[%s] SIGUSR2!\n", "process1");
+	}
+	else if (signo == SIGINT) {
+		fprintf(stderr, "[%s] SIGINT!\n", "process1");
+	}
+	else if (signo == SIGCONT) {
+		fprintf(stderr, "[%s] SIGCONT!\n", "process1");
+	}
+}
+
 /**
  * Program grabs data (calculated number of characters) from process2 and prints
  * grabbed data to the standard output.
@@ -20,11 +42,27 @@ int main(void) {
 	/** 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(SIGUSR2, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGUSR2\n");
+	}
+	if (signal(SIGINT, sig_handler) == SIG_ERR) {
+		fprintf(stderr, "can't catch SIGINT\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));