78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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const char *path = "/tmp/fifo-server-432423";
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char path_pid_1[500];
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char path_pid_2[500];
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const char *suf_1 = "-1-";
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const char *suf_2 = "-2-";
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int m_fifo, m_w, m_r;
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void handle_error(char *txt)
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{
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close(m_w);
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close(m_r);
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perror(txt);
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exit(1);
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}
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int main()
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{
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int p;
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if (access(path, F_OK) == 0)
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unlink(path);
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if ((m_fifo = mkfifo(path, 0600)) == -1)
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handle_error("main mkfifo");
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if ((m_r = open(path, O_RDONLY)) == -1 || (m_w = open(path, O_WRONLY)) == -1)
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{
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unlink(path);
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handle_error("main open");
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}
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printf("otwieranie kolejki\n");
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while (1)
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{
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pid_t client_pid;
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read(m_r, (void *)&client_pid, sizeof(pid_t));
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int pid;
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int db_w, db_r;
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if ((pid = fork()) == -1)
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handle_error("fork");
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if (pid == 0)
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{
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char pid_str[20];
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strcpy(path_pid_1, path);
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strcpy(path_pid_2, path);
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strcpy(path_pid_1, strcat(path_pid_1, suf_1));
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strcpy(path_pid_2, strcat(path_pid_2, suf_2));
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sprintf(pid_str, "%d", client_pid);
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strcpy(path_pid_1, strcat(path_pid_1, pid_str));
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strcpy(path_pid_2, strcat(path_pid_2, pid_str));
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if ((db_r = open(path_pid_1, O_RDONLY)) == -1)
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handle_error("db_r open");
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if ((db_w = open(path_pid_2, O_WRONLY)) == -1)
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handle_error("db_w open");
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double db;
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read(db_r, (void *)&db, sizeof(double));
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printf("%f\n", db);
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db *= 2;
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write(db_w, (void *)&db, sizeof(double));
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printf("%f\n", db);
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close(db_r);
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close(db_w);
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return;
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}
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}
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return 0;
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} |