出错封装函数

/***
client.c
***/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#include "wrap.h"

#define SERV_IP "127.0.0.1"
#define SERV_PORT 6666

int main(void)
{
    int sfd, len;
    struct sockaddr_in serv_addr;
    char buf[BUFSIZ]; 

    sfd = Socket(AF_INET, SOCK_STREAM, 0);

    bzero(&serv_addr, sizeof(serv_addr));                       
    serv_addr.sin_family = AF_INET;                             
    inet_pton(AF_INET, SERV_IP, &serv_addr.sin_addr.s_addr);    
    serv_addr.sin_port = htons(SERV_PORT);                      

    Connect(sfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));

    while (1) {
        fgets(buf, sizeof(buf), stdin);
        int r = Write(sfd, buf, strlen(buf));       
        printf("Write r ======== %d
", r);
        len = Read(sfd, buf, sizeof(buf));
        printf("Read len ========= %d
", len);
        Write(STDOUT_FILENO, buf, len);
    }

    Close(sfd);

    return 0;
}

/***
server.c
***/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <strings.h>
#include <string.h>
#include <ctype.h>
#include <arpa/inet.h>

#include "wrap.h"

#define SERV_PORT 6666

int main(void)
{
    int sfd, cfd;
    int len, i;
    char buf[BUFSIZ], clie_IP[BUFSIZ];

    struct sockaddr_in serv_addr, clie_addr;
    socklen_t clie_addr_len;

    sfd = Socket(AF_INET, SOCK_STREAM, 0);

    bzero(&serv_addr, sizeof(serv_addr));           
    serv_addr.sin_family = AF_INET;                 
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);  
    serv_addr.sin_port = htons(SERV_PORT);          

    Bind(sfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));

    Listen(sfd, 2);                                

    printf("wait for client connect ...
");

    clie_addr_len = sizeof(clie_addr_len);
    cfd = Accept(sfd, (struct sockaddr *)&clie_addr, &clie_addr_len);
    printf("cfd = ----%d
", cfd);

    printf("client IP: %s  port:%d
", 
            inet_ntop(AF_INET, &clie_addr.sin_addr.s_addr, clie_IP, sizeof(clie_IP)), 
            ntohs(clie_addr.sin_port));

    while (1) {
        len = Read(cfd, buf, sizeof(buf));
        Write(STDOUT_FILENO, buf, len);

        for (i = 0; i < len; i++)
            buf[i] = toupper(buf[i]);
        Write(cfd, buf, len); 
    }

    Close(sfd);
    Close(cfd);

    return 0;
}

/***
wrap.h
***/
#ifndef __WRAP_H_
#define __WRAP_H_

void perr_exit(const char *s);
int Accept(int fd, struct sockaddr *sa, socklen_t *salenptr);
int Bind(int fd, const struct sockaddr *sa, socklen_t salen);
int Connect(int fd, const struct sockaddr *sa, socklen_t salen);
int Listen(int fd, int backlog);
int Socket(int family, int type, int protocol);
ssize_t Read(int fd, void *ptr, size_t nbytes);
ssize_t Write(int fd, const void *ptr, size_t nbytes);
int Close(int fd);
ssize_t Readn(int fd, void *vptr, size_t n);
ssize_t Writen(int fd, const void *vptr, size_t n);
ssize_t my_read(int fd, char *ptr);
ssize_t Readline(int fd, void *vptr, size_t maxlen);

#endif

/***
wrap.c
***/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>

void perr_exit(const char *s)
{
    perror(s);
    exit(-1);
}

int Accept(int fd, struct sockaddr *sa, socklen_t *salenptr)
{
    int n;

again:
    if ((n = accept(fd, sa, salenptr)) < 0) {
        if ((errno == ECONNABORTED) || (errno == EINTR))
            goto again;
        else
            perr_exit("accept error");
    }
    return n;
}

int Bind(int fd, const struct sockaddr *sa, socklen_t salen)
{
    int n;

    if ((n = bind(fd, sa, salen)) < 0)
        perr_exit("bind error");

    return n;
}

int Connect(int fd, const struct sockaddr *sa, socklen_t salen)
{
    int n;
    n = connect(fd, sa, salen);
    if (n < 0) {
        perr_exit("connect error");
    }

    return n;
}

int Listen(int fd, int backlog)
{
    int n;

    if ((n = listen(fd, backlog)) < 0)
        perr_exit("listen error");

    return n;
}

int Socket(int family, int type, int protocol)
{
    int n;

    if ((n = socket(family, type, protocol)) < 0)
        perr_exit("socket error");

    return n;
}

ssize_t Read(int fd, void *ptr, size_t nbytes)
{
    ssize_t n;

again:
    if ( (n = read(fd, ptr, nbytes)) == -1) {
        if (errno == EINTR)
            goto again;
        else
            return -1;
    }

    return n;
}

ssize_t Write(int fd, const void *ptr, size_t nbytes)
{
    ssize_t n;

again:
    if ((n = write(fd, ptr, nbytes)) == -1) {
        if (errno == EINTR)
            goto again;
        else
            return -1;
    }
    return n;
}

int Close(int fd)
{
    int n;
    if ((n = close(fd)) == -1)
        perr_exit("close error");

    return n;
}

/*参三: 应该读取的字节数*/                          //socket 4096  readn(cfd, buf, 4096)   nleft = 4096-1500
ssize_t Readn(int fd, void *vptr, size_t n)
{
    size_t  nleft;              //usigned int 剩余未读取的字节数
    ssize_t nread;              //int 实际读到的字节数
    char   *ptr;

    ptr = vptr;
    nleft = n;                  //n 未读取字节数

    while (nleft > 0) {
        if ((nread = read(fd, ptr, nleft)) < 0) {
            if (errno == EINTR)
                nread = 0;
            else
                return -1;
        } else if (nread == 0)
            break;

        nleft -= nread;   //nleft = nleft - nread 
        ptr += nread;
    }
    return n - nleft;
}

ssize_t Writen(int fd, const void *vptr, size_t n)
{
    size_t nleft;
    ssize_t nwritten;
    const char *ptr;

    ptr = vptr;
    nleft = n;
    while (nleft > 0) {
        if ( (nwritten = write(fd, ptr, nleft)) <= 0) {
            if (nwritten < 0 && errno == EINTR)
                nwritten = 0;
            else
                return -1;
        }
        nleft -= nwritten;
        ptr += nwritten;
    }
    return n;
}

static ssize_t my_read(int fd, char *ptr)
{
    static int read_cnt;
    static char *read_ptr;
    static char read_buf[100];

    if (read_cnt <= 0) {
again:
        if ( (read_cnt = read(fd, read_buf, sizeof(read_buf))) < 0) {   //"hello
"
            if (errno == EINTR)
                goto again;
            return -1;
        } else if (read_cnt == 0)
            return 0;

        read_ptr = read_buf;
    }
    read_cnt--;
    *ptr = *read_ptr++;

    return 1;
}

/*readline --- fgets*/    
//传出参数 vptr
ssize_t Readline(int fd, void *vptr, size_t maxlen)
{
    ssize_t n, rc;
    char    c, *ptr;
    ptr = vptr;

    for (n = 1; n < maxlen; n++) {
        if ((rc = my_read(fd, &c)) == 1) {   //ptr[] = hello

            *ptr++ = c;
            if (c == '
')
                break;
        } else if (rc == 0) {
            *ptr = 0;
            return n-1;
        } else
            return -1;
    }
    *ptr = 0;

    return n;
}

以下是自己实现有BUG版本

/***
client.c
***/
#include<stdio.h>

#include<unistd.h>

#include<string.h>

#include<string.h>

#include<sys/socket.h>

#include<arpa/inet.h>



#include"wrap.h"



#define SERV_IP "127.0.0.1"

#define SERV_PORT 6666



int main()

{    

    int sfd,len;

    struct sockaddr_in serv_addr;

    char buf[BUFSIZ];    

    sfd = Socket(AF_INET,SOCK_STREAM,0);    

    bzero(&serv_addr,sizeof(serv_addr) );

    serv_addr.sin_family = AF_INET;

    inet_pton(AF_INET,SERV_IP,&serv_addr.sin_addr.s_addr);

    serv_addr.sin_port = htons(SERV_PORT);

    

    Connect(sfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr) );

    

    while(1)

    {

        fgets(buf,sizeof(buf),stdin);

        int r = Write(sfd,buf,strlen(buf));

        printf("Write r ========= %d
",r);

        len = Read(sfd,buf,sizeof(buf));

        printf("Read len ================ %d
",len);

        Write(STDOUT_FILENO,buf,len);

    }    

    Close(sfd);

    return 0;

}

/***
server.c
***/
#include<stdio.h>

#include<unistd.h>

#include<sys/socket.h>

#include<sys/types.h>

#include<strings.h>

#include<string.h>

#include<ctype.h>

#include<arpa/inet.h>



#include"wrap.h"

#define SERV_PORT 6666



int main()

{

    int sfd,cfd;

    int len,i;

    char buf[BUFSIZ],clie_IP[BUFSIZ];

    

    struct sockaddr_in serv_addr,clie_addr;

    socklen_t clie_addr_len;

    

    sfd = Socket(AF_INET,SOCK_STREAM,0);

    

    bzero(&serv_addr,sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;

    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    serv_addr.sin_port = htons(SERV_PORT);

    

    Bind(sfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr));

    

    Listen(sfd,2);

    

    printf("Wait for client connect ...
");

    

    clie_addr_len = sizeof(clie_addr_len);

    cfd = Accept(sfd,(struct sockaddr*)&clie_addr,&clie_addr_len);

    printf("cfd = ---------%d
",cfd);

    

    printf("client IP:%s port:%d
",

            inet_ntop(AF_INET,&clie_addr.sin_addr.s_addr,clie_IP,sizeof(clie_IP)),

            ntohs(clie_addr.sin_port));

            

    while(1)

    {

        len = Read(cfd,buf,sizeof(buf));

        Write(STDOUT_FILENO,buf,len);

        

        for(i = 0; i < len; i++)

        {

            buf[i] = toupper(buf[i]);

        }

        Write(cfd,buf,len);

    }

    

    close(sfd);

    close(cfd);

    

    return 0;

}

/***
wrap.h
***/
#ifndef __WRAP_H__

#define __WRAP_H__



#include<stdlib.h>

#include<stdio.h>

#include<unistd.h>

#include<errno.h>

#include<sys/socket.h>



void perr_exit(const char* s);



int Accept(int fd,struct sockaddr *sa,socklen_t *salenptr);



int Bind(int fd,const struct sockaddr *sa,socklen_t salen);



int Connect(int fd,const struct sockaddr *sa,socklen_t salen);



int Listen(int fd,int backlog);



int Socket(int family,int type,int protocol);



ssize_t Read(int fd,void *ptr,size_t nbytes);



ssize_t Write(int fd,const void *ptr,size_t nbytes);



int Close(int fd);





ssize_t Readn(int fd,void *vptr,size_t n);



ssize_t Writen(int fd,const void *vptr,size_t n);



ssize_t my_read(int fd,char *ptr);



ssize_t Readline(int fd,void *vptr,size_t maxlen);



#endif 

/***
wrap.c
***/


#include"wrap.h"



void perr_exit(const char* s)

{

    perror(s);

    exit(-1);

}



int Accept(int fd,struct sockaddr *sa,socklen_t *salenptr)

{

    int iRet;



again:

    if((iRet == accept(fd,sa,salenptr)) < 0 )

    {

        if( (errno == ECONNABORTED) || (errno == EINTR)) //econnaborted eintr

            goto again;

        else

            perr_exit("accept error");

    }

    

    return iRet;

}



int Bind(int fd,const struct sockaddr *sa,socklen_t salen)

{

    int iRet;

    if((iRet = bind(fd,sa,salen)) < 0)

    {

        perr_exit("bind error");

    }

    return iRet;

}



int Connect(int fd,const struct sockaddr *sa,socklen_t salen)

{

    int iRet;

    iRet = connect(fd,sa,salen);

    if(iRet < 0)

    {

        perr_exit("connect error");

    }

    

    return iRet;

}



int Listen(int fd,int backlog)

{

    int iRet;

    

    if((iRet = listen(fd,backlog)) < 0)

    {

        perr_exit("listen error");

    }

    

    return iRet;

}



int Socket(int family,int type,int protocol)

{

    int iRet;

    

    if((iRet = socket(family,type,protocol)) < 0)

    {

        perr_exit("socket error");

    }

    

    return iRet;

}



ssize_t Read(int fd,void *ptr,size_t nbytes)

{

    ssize_t iRet;

    

again:

    if((iRet == read(fd,ptr,nbytes)) == -1)

    {

        if(errno == EINTR)

            goto again;

        else

            return -1;

    }

    

    return iRet;

}



ssize_t Write(int fd,const void *ptr,size_t nbytes)

{

    ssize_t iRet;

    

again:

    if((iRet == write(fd,ptr,nbytes)) == -1)

    {

        if(errno == EINTR)

            goto again;

        else

            return -1;

    }

    

    return iRet;

    

}



int Close(int fd)

{

    int iRet;

    

    if((iRet = close(fd)) == -1 )

    {

        perr_exit("close error");

    }

    

    return iRet;

}





ssize_t Readn(int fd,void *vptr,size_t n)

{

    size_t nleft;    //unsigned int -- the bytes that no read

    ssize_t nread;        //int the bytes reading factly

    char *ptr;

    

    ptr = vptr;

    nleft = n;        //n -- bytes that no read

    

    while(nleft > 0)

    {

        if((nread == read(fd,ptr,nleft)) < 0)

        {

            if(errno == EINTR)

            {

                nread = 0;

            }

            else

            {

                return -1;

            }

        }

        else if(nread == 0)

        {

            break;

        }

        

        nleft -= nread;

        ptr += nread;

    }

    return n -nleft;

}



ssize_t Writen(int fd,const void *vptr,size_t n)

{

    size_t nleft;

    ssize_t nwriteten;

    const char *ptr;

    

    ptr = vptr;

    nleft = n;

    

    while(nleft > 0)

    {

        if((nwriteten = write(fd,ptr,nleft)) <= 0)

        {

            if(nwriteten < 0 && errno == EINTR)

            {

                nwriteten = 0;

            }

            else

            {

                return -1;

            }

            nleft -= nwriteten;

            ptr += nwriteten;

        }

    }

    

    return n;

}



ssize_t my_read(int fd,char *ptr)

{

    static int read_cnt;

    static char* read_ptr;

    static char read_buf[100];

    

    if(read_cnt <= 0)

    {

again:

        if((read_cnt = read(fd,read_buf,sizeof(read_buf))) < 0)

        {

            if(errno == EINTR)

                goto again;

            return -1;

        }

        else if(read_cnt == 0)

        {

            return 0;

        }

        

        read_ptr = read_buf;

    }

    

    read_cnt--;

    *ptr = *read_ptr++;

    

    return 1;

}



ssize_t Readline(int fd,void *vptr,size_t maxlen)

{

    ssize_t iRet,rc;

    char c,*ptr;

    ptr = vptr;

    

    for(iRet = 1; iRet < maxlen; iRet++)

    {

        if((rc == my_read(fd,&c)) == 1)

        {

            *ptr++ = c;

            if(c == '
')

                break;

        }

        else if(rc == 0)

        {

            *ptr = 0;

            return iRet - 1;

        }

        else

        {

            return -1;

        }

    }

    *ptr = 0;

    

    return iRet;

}