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Creato programma waitc in cui il parent crea un figlio. Quest'ultimo riceve un numero da terminale e subito manda un sigusr1 al padre. Il parent attende un usr1 o un sigchld e poi termina.

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Giovanni Di Grezia
2014-03-23 17:38:14 +01:00
parent 687e30491e
commit fb267c3d92
3 changed files with 144 additions and 0 deletions
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72
6.process_and_signal/file_communication.c Normal file
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#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <fcntl.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
void sigusr1action (int signal){
fprintf(stdout,"Parent:Ricevuto SIGUSR1\n");
}
void sigchldaction (int signal){
fprintf(stdout,"Parent:Ricevuto SIGCHLD\n");
}
int main (int index, char** in_data){
int duplicate;
duplicate = fork();
if (duplicate < 0)
exit(-1);
if (duplicate == 0){
//child
int numero;
fscanf(stdin,"%d",&numero);
kill (getppid(),SIGUSR1);
fprintf(stdout,"Child:Process %d terminated\n",getpid());
}else{
// parent
struct sigaction sigusr1structure;
sigusr1structure.sa_handler = sigusr1action;
sigusr1structure.sa_flags = 0;
struct sigaction sigchldstructure;
sigchldstructure.sa_handler = sigchldaction;
sigchldstructure.sa_flags = 0;
sigaction (SIGUSR1, &sigusr1structure, NULL);
sigaction (SIGCHLD, &sigchldstructure, NULL);
int status;
int pid;
for (pid = waitpid(-1,&status,0);pid > 0;pid = waitpid(-1,&status,0)){
fprintf(stdout,"Parent:Child %d terminated\n",pid);
}
fprintf(stdout,"Parent:Process %d terminated\n",getpid());
}
return 0;
}

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6.process_and_signal/waitc Executable file
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6.process_and_signal/waitc.c Normal file
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#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <fcntl.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
void sigusr1action (int signal){
fprintf(stdout,"Parent:Ricevuto SIGUSR1\n");
}
void sigchldaction (int signal){
fprintf(stdout,"Parent:Ricevuto SIGCHLD\n");
}
int main (int index, char** in_data){
int duplicate;
duplicate = fork();
if (duplicate < 0)
exit(-1);
if (duplicate == 0){
//child
int numero;
fscanf(stdin,"%d",&numero);
kill (getppid(),SIGUSR1);
fprintf(stdout,"Child:Process %d terminated\n",getpid());
}else{
// parent
struct sigaction sigusr1structure;
sigusr1structure.sa_handler = sigusr1action;
sigusr1structure.sa_flags = 0;
struct sigaction sigchldstructure;
sigchldstructure.sa_handler = sigchldaction;
sigchldstructure.sa_flags = 0;
sigaction (SIGUSR1, &sigusr1structure, NULL);
sigaction (SIGCHLD, &sigchldstructure, NULL);
int status;
int pid;
for (pid = waitpid(-1,&status,0);pid > 0;pid = waitpid(-1,&status,0)){
fprintf(stdout,"Parent:Child %d terminated\n",pid);
}
fprintf(stdout,"Parent:Process %d terminated\n",getpid());
}
return 0;
}