108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
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/*
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Serwer wspolbiezny oparty na kolejekach komunikatow.
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/uio.h>
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#include <signal.h>
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#include <sys/ipc.h>
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#include <sys/msg.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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typedef struct mymesg1
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{
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long mtype;
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pid_t pid;
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} paczka1;
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typedef struct mymesg2
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{
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long mtype;
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double melement;
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} paczka2;
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int f;
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paczka1 *wiad;
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char *sciezka;
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int czy_skasowac = 1;
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void ala(int i)
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{
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if (i == SIGTERM || i == SIGINT)
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{
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printf("Serwer: Koniec pracy serwera.\n");
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free(wiad);
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msgctl(f, IPC_RMID, NULL);
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if (czy_skasowac)
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{
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unlink(sciezka);
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}
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free(sciezka);
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exit(0);
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}
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}
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int main(int argc, char *argv[])
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{
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pid_t pid;
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key_t klucz_kolejka;
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const size_t wielkosc1 = sizeof(paczka1) - sizeof(long);
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ssize_t liczba_bajtow;
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int plik = 0;
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signal(SIGTERM, ala);
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signal(SIGINT, ala);
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sigignore(SIGCHLD);
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if (argc > 1)
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{
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sciezka = strndup(argv[1], strlen(argv[1]));
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}
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else
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{
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sciezka = strndup("/tmp/roboczy.kolejka_serwer", strlen("/tmp/roboczy.kolejka_serwer"));
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}
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if (access(sciezka, F_OK) == 0)
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{
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czy_skasowac = 0;
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}
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plik = open(sciezka, O_CREAT | O_EXCL, 0600);
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close(plik);
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klucz_kolejka = ftok(sciezka, 0);
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f = msgget(klucz_kolejka, 0600 | IPC_CREAT | IPC_EXCL);
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for (;;)
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{
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wiad = (paczka1 *)malloc(sizeof(paczka1));
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liczba_bajtow = msgrcv(f, wiad, wielkosc1, 1, 0);
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printf("Serwer: Przeczytalem %ld bajtow od klienta na glownej kolejce.\n", liczba_bajtow);
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pid = fork();
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if (pid == 0)
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{
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int f1;
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free(sciezka);
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klucz_kolejka = ftok(sciezka, wiad->pid);
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f1 = msgget(klucz_kolejka, 0600);
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paczka2 *praca = (paczka2 *)malloc(sizeof(paczka2));
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const size_t wielkosc2 = sizeof(paczka2) - sizeof(long);
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if ((liczba_bajtow = msgrcv(f1, praca, wielkosc2, 2, 0)) == -1)
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{
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perror("Serwer, proces potomny: Blad funkcji msgrcv.\n");
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return -1;
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}
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printf("Serwer, proces potomny: Przeczytalem %ld bajtow od klienta.\n", liczba_bajtow);
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praca->melement *= praca->melement;
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praca->mtype = 3;
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liczba_bajtow = msgsnd(f1, praca, wielkosc2, 0);
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free(praca);
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return 0;
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}
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else
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{
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sigignore(SIGCHLD);
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}
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}
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}
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