P09 lab code added

P09_Prozesse_und_Threads/Prozesse_und_Threads/Aufgabe07/ChildProcA7.c

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+//***************************************************************************
+// File:             ChildProcA8.c
+// Original Author:  M. Thaler (Modul BSY)
+//***************************************************************************
+
+//***************************************************************************
+// system includes
+//***************************************************************************
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <signal.h>
+
+//***************************************************************************
+// Function: main(), parameter: arg[0]: Programmname, arg[1]: i
+//***************************************************************************
+
+int main(int argc, char *argv[]) {
+
+    int i = 0, *a = NULL;
+
+    if (argc > 1)
+        i = atoi(argv[1]);  // convert string argv[1] to integer i
+                            // argv[1] is a number passed to child
+    
+    printf("\n*** I am the child having job nr. %d ***\n\n", i);
+
+    switch(i) {
+        case 0: exit(0);                // exit normally
+                break;
+        case 1: *a     = i;             // force segmentation error
+                break;
+        case 2: kill(getpid(), 30);     // I send signal 30 to myself
+                break;
+        case 3: sleep(5);               // sleep and wait for signal
+                break;
+        case 4: sleep(5);               // just sleep
+                exit(222);              // then exit
+                break;
+        default:
+                exit(-1); 
+    }
+    exit(0);
+}
+
+//***************************************************************************

P09_Prozesse_und_Threads/Prozesse_und_Threads/Aufgabe07/ProcA7.c

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+//***************************************************************************
+// File:             ProcA8.c
+// Original Author:  M. Thaler (Modul BSY)
+//***************************************************************************
+
+//***************************************************************************
+// system includes
+//***************************************************************************
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+
+//***************************************************************************
+// Function: main(), parameter: none
+//***************************************************************************
+
+int main(int argc, char *argv[]) {
+    pid_t  pid;
+    int    status, retval, whatToDo = 0;
+    char   str[8];
+
+    if (argc > 1)
+        whatToDo = atoi(argv[1]);       // get job number for child
+
+    pid = fork();                       // fork child
+    switch (pid) {
+      case -1:
+        perror("Could not fork");
+        break;
+      case 0:
+        sprintf(str, "%d",whatToDo); 
+        retval = execl("./ChildProcA7.e", "ChildProcA7.e", str, NULL);
+        if (retval < 0) perror("\nexecl not successful");
+        break;
+      default:
+        if (whatToDo <= 3) {
+            if (whatToDo == 3) {
+                sleep(1);          
+                kill(pid, SIGABRT);              // send signal SIGABTR to child
+            }
+            wait(&status);
+            if (WIFEXITED(status))
+                printf("Child exits with status    %d\n", WEXITSTATUS(status));
+            if (WIFSIGNALED(status)) {
+                printf("Child exits on signal      %d\n", WTERMSIG(status));
+                printf("Child exits with core dump %d\n", WCOREDUMP(status));
+            }
+        } else {
+            usleep(500*1000);
+            while (!waitpid(pid, &status, WNOHANG)) {
+                printf(". . . child is playing\n");
+                usleep(500*1000);
+            }
+            printf("Child has exited with 'exit(%d)'\n", WEXITSTATUS(status)); 
+        }
+        break;
+    }
+    exit(0);
+}
+
+//***************************************************************************

P09_Prozesse_und_Threads/Prozesse_und_Threads/Aufgabe07/README

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+
+Enable core dumps     ->   ulimit -c unlimited
+Disable core dumps    ->   ulimit -c 0
+
+Das core File lesen mit gdb:
+
+	gdb -c core ChildProgA8.e
+
+
+!!!! Wichtig !!!!
+
+Wenn sie ein Linux benutzen, das standardmaessig ABRT (Automatic Bug
+Reporting Tool) verwendet (z.B. Fedora, Centos, etc.), muss 
+/proc/sys/kernel/core_pattern auf "core" gesetzt werden, damit ein 
+core File erzeugt wird
+
+    echo core > /proc/sys/kernel/core_pattern
+
+Wenn ihr System SE-Linux verwendet (z.B. Fedora) , laesst sich core_pattern
+nicht auf einfache Art setzen, verzichten sie in diesem Fall auf die
+Erzeugung des "core" Files. 

P09_Prozesse_und_Threads/Prozesse_und_Threads/Aufgabe07/makefile

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+# *************************************************************
+# Original Autor:  M. Thaler (Modul BSY)
+# *************************************************************
+
+CMP=        gcc
+CMPFLAGS=   -Wall -g
+LDFLAGS=
+EXENAME=    ProcA7.e
+FNAME=      ProcA7
+EXENAMC=    ChildProcA7.e
+FNAMC=      ChildProcA7
+LIBNAME=
+LIBNAME=
+
+compile: $(EXENAME) $(EXENAMC)
+
+$(EXENAME): $(FNAME).o
+	$(CMP)  $(FNAME).o $(LIBNAME) $(LDFLAGS) -o $@
+
+$(EXENAMC):	$(FNAMC).o
+	$(CMP)  $(FNAMC).o $(LIBNAME) $(LDFLAGS) -o $@
+
+.c.o:
+	$(CMP) -c $(CMPFLAGS) $<
+
+.cc.o:
+	$(CMP) -c $(CMPFLAGS) $<
+
+clean:
+	rm -f core *.o $(EXENAME) $(EXENAMC)
+
+all:
+	@make clean
+	@make