X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=sources%2FFifoReporter.c;h=0ce8c37df0313cb39d07267077e424558c7adee1;hp=5062e84c63143823c18c3cb774dc5c9454b98a4a;hb=26f7a8bb19c6cb198c213757a97b6ac79e40db4b;hpb=7d224ad655c0a530877f39411d43a91e3d7318e1

diff --git a/sources/FifoReporter.c b/sources/FifoReporter.c
index 5062e84..0ce8c37 100644
--- a/sources/FifoReporter.c
+++ b/sources/FifoReporter.c
@@ -41,25 +41,63 @@
 #include <signal.h>	 /* signal constants, types and functions */
 #include <fcntl.h>	 /* file control functions */
 #include <sys/epoll.h>   /* Linux epoll interface */
+#include <sys/signalfd.h>/* Linux signalfd interface */
 
 #include "macros.h"
 #include "Gapil.h"
 
 /* Subroutines declaration */
 void usage(void);
+void die(char *);
 
 /* default name for the input fifo */
 char *fifoname = "/tmp/reporter.fifo";
 
+#define MAX_EPOLL_EV 10
+
 int main(int argc, char *argv[])
 {
 /* Variables definition */
-    int i, nread, t = 1;
+    int i, n, nread, t = 10;
     char buffer[4096];
     int fifofd, epfd, sigfd;
-    struct epoll_event epev;
     sigset_t sigmask;
-    char buffer[1024];
+    struct epoll_event epev, events[MAX_EPOLL_EV];
+    struct signalfd_siginfo siginf;
+    char *sig_names[] = { // signal name declaration from bits/signum.h
+	"-------       ", /*0        Filler for signal names array */
+	"SIGHUP        ", /*1        Hangup (POSIX).  */
+	"SIGINT        ", /*2        Interrupt (ANSI).  */
+	"SIGQUIT       ", /*3        Quit (POSIX).  */
+	"SIGILL        ", /*4        Illegal instruction (ANSI).  */
+	"SIGTRAP       ", /*5        Trace trap (POSIX).  */
+	"SIGABRT       ", /*6        Abort (ANSI).  */
+	"SIGBUS        ", /*7        BUS error (4.2 BSD).  */
+	"SIGFPE        ", /*8        Floating-point exception (ANSI).  */
+	"SIGKILL       ", /*9        Kill, unblockable (POSIX).  */
+	"SIGUSR1       ", /*10       User-defined signal 1 (POSIX).  */
+	"SIGSEGV       ", /*11       Segmentation violation (ANSI).  */
+	"SIGUSR2       ", /*12       User-defined signal 2 (POSIX).  */
+	"SIGPIPE       ", /*13       Broken pipe (POSIX).  */
+	"SIGALRM       ", /*14       Alarm clock (POSIX).  */
+	"SIGTERM       ", /*15       Termination (ANSI).  */
+	"SIGSTKFLT     ", /*16       Stack fault.  */
+	"SIGCHLD       ", /*17       Child status has changed (POSIX).  */
+	"SIGCONT       ", /*18       Continue (POSIX).  */
+	"SIGSTOP       ", /*19       Stop, unblockable (POSIX).  */
+	"SIGTSTP       ", /*20       Keyboard stop (POSIX).  */
+	"SIGTTIN       ", /*21       Background read from tty (POSIX).  */
+	"SIGTTOU       ", /*22       Background write to tty (POSIX).  */
+	"SIGURG        ", /*23       Urgent condition on socket (4.2 BSD).  */
+	"SIGXCPU       ", /*24       CPU limit exceeded (4.2 BSD).  */
+	"SIGXFSZ       ", /*25       File size limit exceeded (4.2 BSD).  */
+	"SIGVTALRM     ", /*26       Virtual alarm clock (4.2 BSD).  */
+	"SIGPROF       ", /*27       Profiling alarm clock (4.2 BSD).  */
+	"SIGWINCH      ", /*28       Window size change (4.3 BSD, Sun).  */
+	"SIGIO         ", /*29       I/O now possible (4.2 BSD).  */
+	"SIGPWR        ", /*30       Power failure restart (System V).  */
+	"SIGSYS        "  /*31       Bad system call.  */
+    };
     /*
      * Input section: decode parameters passed in the calling 
      * Use getopt function
@@ -98,68 +136,85 @@ int main(int argc, char *argv[])
     /* 
      * Initial setup 
      */
-    if (mkfifo(fifoname, 0622)) {  // create well known fifo if does't exist 
-	if (errno!=EEXIST) {
-	    perror("Cannot create well known fifo");
-	    exit(1);
-	}
-    }
-    epfd = epoll_create(5);       // initialize epoll
-    if (epfd < 0) {
-        perror("Failing on epoll_create");
-        exit(1);
-    }
-    if ((fifofd = open(fifoname, O_RDONLY|O_NONBLOCK)) < 0) {  // open fifo
-	perror("Cannot open read only well known fifo");
-	exit(1);
-    }
-    epev.data.fd = fifofd;        /* add fifofd to epoll */
-    epev.events = EPOLLIN;
-    if (epoll_ctl(epfd, EPOLL_CTL_ADD, fifofd, &epev)) {
-        perror("Failing in epoll_ctl");
-        exit(-1);
-    }
+    if ((epfd=epoll_create(5)) < 0)                          // epoll init
+	die("Failing on epoll_create");
+    /* Signal setup for signalfd and epoll use */
     sigemptyset(&sigmask);
     sigaddset(&sigmask, SIGINT);
     sigaddset(&sigmask, SIGQUIT);
     sigaddset(&sigmask, SIGTERM);
-    // blocking signal treated by signalfd to avoid default action
-    if (sigprocmask(SIG_BLOCK, &sigmask, NULL) == -1) {
-	perror("Failing in sigprocmask");
-	exit(1);
-    }
-    if ((sigfd=signalfd(-1, &sigmask, SFD_NONBLOCK)) == -1) {
-	perror("Failing in signalfd");
-	exit(-1);
-    }
-    epev.data.fd = sigfd;        /* add sigfd to epoll */
+    if (sigprocmask(SIG_BLOCK, &sigmask, NULL) == -1)       // block signals
+	die("Failing in signalfd");
+    if ((sigfd=signalfd(-1, &sigmask, SFD_NONBLOCK)) == -1) // take a signalfd
+	die("Failing in signalfd");
+    epev.data.fd = sigfd;                                   // add fd to epoll
     epev.events = EPOLLIN;
-    if (epoll_ctl(epfd, EPOLL_CTL_ADD, sigfd, &epev)) {
-        perror("Failing in epoll_ctl");
-        exit(-1);
+    if (epoll_ctl(epfd, EPOLL_CTL_ADD, sigfd, &epev))
+	die("Failing in signal epoll_ctl"); 
+    /* Fifo setup for epoll use */
+    if (mkfifo(fifoname, 0622)) {  // create well known fifo if does't exist 
+	if (errno!=EEXIST)
+	    die("Cannot create well known fifo");
     }
-    
-    /* Main body: loop over requests */
+    if ((fifofd = open(fifoname, O_RDWR|O_NONBLOCK)) < 0)   // open fifo
+	die("Cannot open well known fifo");
+    epev.data.fd = fifofd;                                  // add fd to epoll
+    epev.events = EPOLLIN;
+    if (epoll_ctl(epfd, EPOLL_CTL_ADD, fifofd, &epev)) 
+	die("Failing in fifo epoll_ctl");
+    /* 
+     * Main body: wait something to report 
+     */
+    printf("FifoReporter starting, pid %i\n", getpid());
     while (1) {
-        if ((i = epoll_wait(epfd, &epev, 1, -1)) < 0) {
-            perror("error on epoll_wait");
-            exit(-1);
-        }
-	switch (epev.fd) {
-	/* 
-	 * Handling options 
-	 */ 
-	case sigfd:
-	    // signals
-	    break;
-	case fifofd:
-	    // fifo
-	    break;
-	default:                                       /* should not reached */
-	    printf("something wrong, epoll activity on unknown %i file descriptor\n", epev.data.fd);
-	    exit(-1);
+        if ((n=epoll_wait(epfd, events, MAX_EPOLL_EV, -1)) < 0) 
+	    die("error on epoll_wait");
+	debug("Got %i events\n", n);
+	/* loop on epoll events */
+	for (i=0; i<n; i++) {    
+	    if (events[i].data.fd == sigfd) {             // if signalfd ready 
+		printf("Signal received:\n");
+		while(nread=read(sigfd, &siginf, sizeof(siginf))) {
+		    if (nread < 0) {
+			if (errno != EAGAIN) 
+			    die("signalfd read error");
+			else 
+			    break;
+		    }
+		    if (nread != sizeof(siginf)) {
+			printf("Error on signal data read, '\n");
+			continue;
+		    }
+		    printf("Got %s\n", sig_names[siginf.ssi_signo]);
+		    printf("From pid %i\n", siginf.ssi_pid);
+		    if(siginf.ssi_signo == SIGINT) {      // SIGINT is exit
+			printf("SIGINT means exit\n");
+			unlink(fifoname);
+			exit(0);
+		    }
+		}
+	    } else if (events[i].data.fd == fifofd) {     // if fifofd ready 
+		printf("Message from fifo:\n");
+		while ((nread = read(fifofd, buffer, 5000))) {
+		    debug("read %i from fifofd %i, event %i\n", 
+			   nread, fifofd, events[i].data.fd );
+		    if (nread < 0) {
+			if (errno != EAGAIN)
+			    die("fifo read error");
+			else 
+			    printf("end message\n");
+			break;
+		    }
+		    buffer[nread] = 0;
+		    if (fputs(buffer, stdout) == EOF)
+			die("Error on terminal write");
+		}
+	    } else {   // anything else is an error
+		printf("epoll activity on unknown %i file descriptor\n", 
+		       epev.data.fd);
+		exit(-1);
+	    }
 	}
-	
     }
     debug("Exiting for unknown reasons\n");
 }
@@ -167,18 +222,17 @@ int main(int argc, char *argv[])
  * routine to print usage info and exit
  */
 void usage(void) {
-    printf("Elementary fortune server\n");
+    printf("Elementary event reporter\n");
     printf("Usage:\n");
-    printf("  fortuned [-h] [-f] -n XXX \n");
-    printf("  -h   print this help\n");
-    printf("  -t filename   set fifo file\n");
+    printf("  reporterd [-h] [-f] -n XXX \n");
+    printf("  -h\t print this help\n");
+    printf("  -f\t filename   set fifo file\n");
     exit(1);
 }
 /*
- * Signal Handler to manage termination
+ * Print error message and exit routine
  */
-void HandSIGTERM(int signo) {
-    debug("Terminated by %s\n", strsignal(signo));
-    unlink(fifoname);
-    exit(0);
+void die(char * mess) {
+    perror(mess);
+    exit(-1);
 }