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Commit c60abbe

Browse files
committed
code working status 1
0 parents commit c60abbe

31 files changed

+1100
-0
lines changed

‎ResourceLimits/resourceLimits.c‎

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#include <stdio.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <string.h>
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main(int argc ,char *argv[])
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{
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int fileDescriptor;
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int k;
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char *buf = "Hello";
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struct rlimit rLim = { 30 ,100};
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struct rlimit rlimGet;
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setrlimit(RLIMIT_FSIZE ,&rLim); /*RLIMIT_FSIZE : setting maximum limit */
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fileDescriptor = open(argv[1] ,O_CREAT | O_TRUNC | O_RDONLY ,0600);
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getrlimit(RLIMIT_FSIZE ,&rlimGet);
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printf("Soft Link : %d\n" ,rlimGet.rlim_cur);
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printf("Hard Link : %d\n" ,rlimGet.rlim_max);
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for(k = 0 ;k <20 ;k++)
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{
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printf("Attempting to write %d by 6-bytes\n" ,strlen(buf));
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write(fileDescriptor ,buf ,strlen(buf));
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printf("successfully written %d bytes \n" ,strlen(buf));
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}
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close(fileDescriptor);
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}

‎SignalHandlers/signalBlocking.c‎

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#include <stdio.h>
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#include <signal.h>
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void signalHandler( int sigNum )
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{
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switch(sigNum)
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{
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case SIGTERM :
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printf("SIGTERM SIGNAL RECIEVED\N");
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break;
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case SIGINT :
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printf("SIGINT SIGNAL RECIEVED\N");
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break;
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case SIGCONT :
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printf("SIGCONT SIGNAL RECIEVED\N");
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break;
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}
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}
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main()
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{
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char buffer[100] = "0円";
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sigset_t block;
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signal(SIGTERM ,signalHandler);
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signal(SIGINT ,signalHandler);
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signal(SIGCONT ,signalHandler);
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sigemptyset(&block); /*refering to empty sigset_t variable so it doesnt refer to any signals*/
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sigaddset(&block ,SIGTERM); /*Adding signals to empty set*/
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sigaddset(&block ,SIGINT);
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sigprocmask(SIG_BLOCK ,&block ,NULL); /*Blocking signal & providing list of Signals to be blocked as block*/
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while(strcmp(buffer ,"n") != 0)
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{
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printf("Enter a string : ");
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gets(buffer);
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puts(buffer);
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}
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sigprocmask(SIG_UNBLOCK ,&block ,NULL); /*UnBlocking signal*/
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while(1)
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{
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printf("Program Running\n");
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}
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return 0;
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}

‎SignalHandlers/signal_AlarmPause.c‎

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#include <stdio.h>
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#include <signal.h>
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void signalHandler( int sigNum )
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{
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printf("we are in signal handler module recieved signal %d %s\n" ,sigNum ,sys_siglist[sigNum]);
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}
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main()
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{
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int ret;
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signal(SIGALRM ,signalHandler);
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printf("About to call Alarm\n");
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ret = alarm(10);
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printf("alarm() system call returns %d\n" ,ret);
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ret = alarm(20);
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printf("alarm() system call returns %d\n" ,ret);
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printf("pause will block\n");
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pause();
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printf("SIGALARM is rasied and handled ,the flow continues\n");
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}
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/* inheriting signal handler by child process */
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#include <stdio.h>
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#include <signal.h>
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void signalHandler( int sigNum )
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{
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int status;
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printf("In handler ,invoked in response to signum : %d\t%s signal\n " ,sigNum ,sys_siglist[sigNum]); /*sys_siglist : array of string which maps signal number to string names*/
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wait(&status);
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}
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main()
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{
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pid_t pId;
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signal(SIGCHLD ,signalHandler); /* SIGCHLD is normally sent to a process to notify that one of its child processes ended, so the parent process can collect its exit code.*/
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pId = fork();
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if(pId == 0) /*Child Process*/
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{
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printf("Child process\n");
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exit(0);
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}
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else
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{
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printf("Parent process\n");
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getchar();
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}
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}

‎SignalHandlers/signal_kill.c‎

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/* signal from one process to other : kil() */
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#include <stdio.h>
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#include <signal.h>
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main()
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{
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pid_t pId;
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int status;
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pId = fork();
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if( pId == 0 )
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{
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printf("child Process Activated : %d\n" ,getpid());
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}
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else
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{
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printf("Parent Process Activated : %d\n" ,getpid());
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kill(pId ,SIGKILL);
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wait(&status);
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printf("child Process is Killed\n");
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printf("Parent Terminated\n");
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getchar();
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}
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}

‎SignalHandlers/signal_raise.c‎

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/* sending signal to itself : raise() */
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#include <stdio.h>
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#include <signal.h>
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main()
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{
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printf("we are in process with pId : %d\n" ,getpid());
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/*kill(getpid() ,SIGILL)*/
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getchar();
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raise(SIGKILL);
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}
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/* Registering handler with the kernel */
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#include <stdio.h>
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#include <signal.h>
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void sigHandler(int sigNo)
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{
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printf("In signal handler module recieved signal is %d %s\n" ,sigNo ,sys_siglist[sigNo]);
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}
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main(void)
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{
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signal(SIGINT ,sigHanlder);
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getchar();
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}
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/* Common method for multiple signal handling */
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#include <stdio.h>
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#include <signal.h>
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/* execution of code can be aborted in signal handler itself by using the exit(0) beyond the */
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void handleSignal( int sigNo )
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{
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printf("In signal handler module recieved signal is %d %s\n" ,sigNo ,sys_siglist[sigNo]);
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}
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main( void )
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{
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signal(SIGINT ,handleSignal); /* SIGINT : interrupt from keyboard CTRL+C */
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signal(SIGTERM ,handlerSignal); /* SIGTERM: termination signal *
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getchar();
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}

‎SignalHandlers/signal_sigAction.c‎

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#include <stdio.h>
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#include <signal.h>
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void sigHandler( int sigNum )
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{
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printf("we are in signal handler module recieved signal %d %s\n" ,sigNum ,sys_siglist[sigNum]);
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}
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main()
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{
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struct sigaction action = { sigHandler };
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sigaction(SIGINT ,&action ,NULL);
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while(1)
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{
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};
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}

‎fileManagement/.gitkeep‎

Whitespace-only changes.

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