feat: libraries lab complete

В задании просят починить файлы, но фактически они даются нам уже рабочими, поэтому мне нужно только разобраться с тем, что происходит внутри

OSs/lab-libs/Makefile

@@ -0,0 +1,22 @@
+all: dynamic static
+
+dynamic: main.o lib.so
+	gcc $^ -o $@ $(CFLAGS) -lm
+
+static: main.o lib.a
+	gcc $^ -o $@ $(CFLAGS) -lm
+
+lib.so: lib.o
+	gcc -shared $^ -o $@ $(CFLAGS)
+
+lib.a: lib.o
+	ar r $@ $^
+
+main.o: main.c
+	gcc -c $^ -o $@ $(CFLAGS)
+
+lib.o: lib.c
+	gcc -c -o $@ -fPIC $^ $(CFLAGS)
+
+clean:
+	rm -f dynamic static *.so *.o

OSs/lab-libs/lib.c

@@ -0,0 +1,45 @@
+#include "lib.h"
+
+#include <math.h>
+
+#define ZEROIN_MAX_ITERATIONS 1000
+
+size_t fibo(size_t n)
+{
+    size_t prev = 0, cur = 1, tmp = 0;
+    for (size_t i = 0; i < n; i++) {
+        tmp = cur;
+        cur = cur + prev;
+        prev = tmp;
+    }
+    return cur;
+}
+
+double zeroin(double (*f)(double), double err, double a, double b)
+{
+    double left = f(a);
+    if (fabs(left) < err) return left;
+    double right = f(b);
+    if (fabs(right) < err) return right;
+    if (left * right > 0) {
+        return NAN;
+    }
+
+    double x = NAN;
+    double cur = NAN;
+    size_t n = 0;
+    do {
+        x = (a + b) / 2;
+        cur = f(x);
+        if (cur * left > 0) {
+            left = cur;
+            a = x;
+        }
+        else {
+            right = cur;
+            b = x;
+        }
+        n++;
+    } while (fabs(cur) > err || n < ZEROIN_MAX_ITERATIONS);
+    return x;
+}

OSs/lab-libs/lib.h

@@ -0,0 +1,21 @@
+#ifndef LIB_H_
+#define LIB_H_
+
+#include <stdlib.h>
+
+/**
+ * Это будет просто какая-то не очень умная библиотечка с двумя функциями,
+ * просто чтобы их типа собрать
+ */
+
+/**
+ * Считает n-ное число фибоначи
+ */
+size_t fibo(size_t n);
+
+/**
+ * Считает ноль функции на интервале с указанной погрешностью
+ */
+double zeroin(double (*f)(double), double err, double a, double b);
+
+#endif

OSs/lab-libs/main.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <math.h>
+#include "lib.h"
+
+#define FIBO_NUM 15
+
+#define SIN_A 1.6
+#define SIN_B 3.7
+#define ZEROIN_ERR 0.001
+
+int main()
+{
+    printf("fibonachi number under index %u: %zu\n", FIBO_NUM, fibo(FIBO_NUM));
+    printf("zero of sin(x) in interval (%lf %lf) is %lf\n",
+            SIN_A, SIN_B, zeroin(sin, ZEROIN_ERR, SIN_A, SIN_B));
+    return 0;
+}

OSs/lab6/Makefile

@@ -0,0 +1,15 @@
+targets = server_msg client_msg
+all: $(targets)
+
+server_msg: server_msg.o
+	$(CC) -o $@ $^ $(CFLAGS)
+
+client_msg: client_msg.o
+	$(CC) -o $@ $^ $(CFLAGS)
+
+%.o: %.c
+	$(CC) -c $^ -o $@ $(CFLAGS)
+
+clean:
+	rm -f $(targets)
+	rm -f *.o

OSs/lab6/client_msg.c

@@ -0,0 +1,99 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/msg.h>
+#define MQ_KEY1 1234L
+#define MQ_KEY2 2345L
+#define MAXMESGDATA 4096
+
+struct mymesg {
+    long mesg_len;
+    long mesg_type;
+    char mesg_data[MAXMESGDATA];
+};
+
+void client(int readid, int writeid);
+ssize_t mesg_send(int id, struct mymesg *mptr);
+ssize_t mesg_recv(int id, struct mymesg *mptr);
+
+int main(int argc,char **argv)
+{
+    int readid, writeid;
+
+    if((writeid=msgget(MQ_KEY1,0666)) < 0)
+    {
+        printf("Client: can not get writeid!\n");
+        exit(1);
+    }
+    printf("Client:writeid=%d\n",writeid);
+
+    if((readid=msgget(MQ_KEY2,0666)) < 0)
+    {
+        printf("Client: can not get readid!\n");
+        exit(1);
+    }
+    printf("Client: readid=%d\n",readid);
+
+    client(readid,writeid);
+
+    if((msgctl(readid,IPC_RMID, NULL)) < 0)
+    {
+        printf("Client: can not delete massage queue2!\n"); exit(1);
+    }
+
+    if((msgctl(writeid,IPC_RMID, NULL)) < 0)
+    {
+        printf("Client: can not delete massage queue1!\n"); exit(1);
+    }
+
+    exit(0);
+}
+
+void client(int readid, int writeid)
+{
+    size_t len;
+    ssize_t n;
+    struct mymesg ourmesg;
+
+    printf("Client:readid=%d writeid=%d\n",readid,writeid);
+    printf("Input file name, please\n");
+
+    fgets(ourmesg.mesg_data,MAXMESGDATA, stdin);
+    len=strlen(ourmesg.mesg_data);
+
+    if(ourmesg.mesg_data[len-1]=='\n') len--;
+    ourmesg.mesg_len=len;
+
+    ourmesg.mesg_type=1;
+
+    printf("Client: %s\n",ourmesg.mesg_data);
+
+    mesg_send(writeid,&ourmesg);
+
+    printf("Client: tvk before recv!\n");
+
+    while((n= mesg_recv(readid, &ourmesg))>0)
+        //n= mesg_recv(readid, &ourmesg);
+        write(1,ourmesg.mesg_data, n);
+}
+
+ssize_t mesg_send(int id, struct mymesg *mptr)
+{
+    return(msgsnd(id, &(mptr->mesg_type),mptr->mesg_len, 0));
+}
+
+ssize_t mesg_recv(int id, struct mymesg *mptr)
+{
+    ssize_t n;
+
+    n=msgrcv(id, &(mptr->mesg_type),MAXMESGDATA,mptr->mesg_type, 0);
+    mptr->mesg_len=n;
+    printf("Client: n=%d\n",n);
+
+    return(n);	
+}
+

OSs/lab6/server_msg.c

@@ -0,0 +1,116 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/msg.h>
+#define MQ_KEY1 1234L
+#define MQ_KEY2 2345L
+#define MAXMESGDATA 4096
+
+struct mymesg {
+    long mesg_len;
+    long mesg_type;
+    char mesg_data[MAXMESGDATA];
+};
+
+void server(int readid, int writeid);
+ssize_t mesg_send(int id, struct mymesg *mptr);
+ssize_t mesg_recv(int id, struct mymesg *mptr);
+
+int main(int argc,char **argv)
+{
+    int readid, writeid;
+    key_t key1,key2;
+
+    printf("Server: Hello tvk!\n");
+
+    /*
+       if((key1=ftok("/home/tvk/IPC/input.txt",'A'))<0)
+       {
+       printf("Server: can not get key!\n"); exit(1);
+       }
+       printf("key1=%x\n",key1);
+   */
+    if((readid=msgget(MQ_KEY1, 0666|IPC_CREAT)) < 0)
+    {
+        printf("Server: can not get readid!\n"); exit(1);
+    }
+    printf("Server: readid=%d\n",readid);
+    /*	
+        if((key2=ftok("/home/tvk/IPC/server_msg.c",'B'))<0)
+        {
+        printf("Server: can not get key!\n"); exit(1);
+        }
+        printf("key2=%x\n",key2);
+        */
+    if((writeid=msgget(MQ_KEY2, 0666|IPC_CREAT)) < 0)
+    {
+        printf("Server: can not get readid!\n"); exit(1);
+    }
+    printf("Server: writeid=%d\n",writeid);
+
+    server(readid,writeid);
+
+    exit(0);
+}
+
+void server(int readid, int writeid)
+{
+    FILE *fp;
+    ssize_t n;
+    struct mymesg ourmesg;
+
+    printf("Server:readid=%d writeid=%d\n",readid,writeid);
+
+    ourmesg.mesg_type=1;
+
+    if( (n=mesg_recv(readid, &ourmesg)) == 0)
+    {
+        printf("Server: can not read file name\n");
+        exit(1);	
+    }
+    ourmesg.mesg_data[n]='\0';
+
+    printf("Server: file name %s\n",ourmesg.mesg_data);
+
+    if( (fp=fopen(ourmesg.mesg_data,"r"))==NULL)
+    {
+        printf("Server: can not open file name\n");
+
+    }
+    else
+    {
+        printf("Server: %s is opened\n",ourmesg.mesg_data);
+
+        while(fgets(ourmesg.mesg_data, MAXMESGDATA,fp) != NULL)
+        { 
+            ourmesg.mesg_len=strlen(ourmesg.mesg_data);
+            printf("Server: %s\n",ourmesg.mesg_data);
+            mesg_send(writeid,&ourmesg);
+        }
+    }
+    fclose(fp);
+    ourmesg.mesg_len=0;
+    mesg_send(writeid,&ourmesg);
+}
+
+ssize_t mesg_send(int id, struct mymesg *mptr)
+{
+    return(msgsnd(id, &(mptr->mesg_type),mptr->mesg_len, 0));	
+}
+
+ssize_t mesg_recv(int id, struct mymesg *mptr)
+{
+    ssize_t n;
+    n=msgrcv(id, &(mptr->mesg_type),MAXMESGDATA,mptr->mesg_type, 0);
+    mptr->mesg_len=n;
+
+    return(n);	
+}
+
+
+
+