#include <pthread.h>
            int pthread_create(pthread_t *thread,pthread_attr_t *attr,
            void *(*start_routine)(void *),void *arg);
            void pthread_exit(void *retval);
            int pthread_join(pthread *thread,void **thread_return);

#include <stdio.h>
            #include <unistd.h>
            #include <stdlib.h>
            #include <string.h>
            #include <errno.h>
            #include <pthread.h>
            #include <dirent.h>
            #include <fcntl.h>
            #include <sys/types.h>
            #include <sys/stat.h>
            #include <sys/time.h>
            #define BUFFER 512
            struct copy_file {
            int infile;
            int outfile;
            };
            void *copy(void *arg)
            {
            int infile,outfile;
            int bytes_read,bytes_write,*bytes_copy_p;
            char buffer[BUFFER],*buffer_p;
            struct copy_file *file=(struct copy_file *)arg;
            infile=file->infile;
            outfile=file->outfile;
            /* 因?yàn)榫€程退出時(shí),所有的變量空間都要被釋放,所以我們只好自己分配內(nèi)存了 */
            if((bytes_copy_p=(int *)malloc(sizeof(int)))==NULL) pthread_exit(NULL);
            bytes_read=bytes_write=0;
            *bytes_copy_p=0;
            while((bytes_read=read(infile,buffer,BUFFER))!=0)
            {
            if((bytes_read==-1)&&(errno!=EINTR))break;
            else if(bytes_read>0)
            {
            buffer_p=buffer;
            while((bytes_write=write(outfile,buffer_p,bytes_read))!=0)
            {
            if((bytes_write==-1)&&(errno!=EINTR))break;
            else if(bytes_write==bytes_read)break;
            else if(bytes_write>0)
            {
            buffer_p+=bytes_write;
            bytes_read-=bytes_write;
            }
            }
            if(bytes_write==-1)break;
            *bytes_copy_p+=bytes_read;
            }
            }
            close(infile);
            close(outfile);
            pthread_exit(bytes_copy_p);
            }
            int main(int argc,char **argv)
            {
            pthread_t *thread;
            struct copy_file *file;
            int byte_copy,*byte_copy_p,num,i,j;
            char filename[BUFFER];
            struct dirent **namelist;
            struct stat filestat;
            /* 得到當(dāng)前路徑下面所有的文件(包含目錄)的個(gè)數(shù) */
            if((num=scandir(".",&namelist,0,alphasort))<0)
            {
            fprintf(stderr,"Get File Num Error:%s\n\a",strerror(errno));
            exit(1);
            }
            /* 給線程分配空間,其實(shí)沒有必要這么多的 */
            if(((thread=(pthread_t *)malloc(sizeof(pthread_t)*num))==NULL)||
            ((file=(struct copy_file *)malloc(sizeof(struct copy_file)*num))==NULL)
            )
            {
            fprintf(stderr,"Out Of Memory!\n\a");
            exit(1);
            }
            for(i=0,j=0;i<num;i++)
            {
            memset(filename,'\0',BUFFER);
            strcpy(filename,namelist[i]->d_name);
            if(stat(filename,&filestat)==-1)
            {
            fprintf(stderr,"Get File Information:%s\n\a",strerror(errno));
            exit(1);
            }
            /* 我們忽略目錄 */
            if(!S_ISREG(filestat.st_mode))continue;
            if((file[j].infile=open(filename,O_RDONLY))<0)
            {
            fprintf(stderr,"Open %s Error:%s\n\a",filename,strerror(errno));
            continue;
            }
            strcat(filename,".bak");
            if((file[j].outfile=open(filename,O_WRONLY|O_CREAT,S_IRUSR|S_IWUSR))
            <0)
            {
            fprintf(stderr,"Creat %s Error:%s\n\a",filename,strerror(errno
            ));
            continue;
            }
            /* 創(chuàng)建線程,進(jìn)行文件拷貝 */
            if(pthread_create(&thread[j],NULL,copy,(void *)&file[j])!=0)
            fprintf(stderr,"Create Thread[%d] Error:%s\n\a",i,strerror(errno));
            j++;
            }
            byte_copy=0;
            for(i=0;i<j;i++)
            {
            /* 等待線程結(jié)束 */
            if(pthread_join(thread[i],(void **)&byte_copy_p)!=0)
            fprintf(stderr,"Thread[%d] Join Error:%s\n\a",
            i,strerror(errno));
            else
            {
            if(bytes_copy_p==NULL)continue;
            printf("Thread[%d] Copy %d bytes\n\a",i,*byte_copy_p);
            byte_copy+=*byte_copy_p;
            /* 釋放我們在copy函數(shù)里面創(chuàng)建的內(nèi)存 */
            free(byte_copy_p);
            }
            }
            printf("Total Copy Bytes %d\n\a",byte_copy);
            free(thread);
            free(file);
            exit(0);
            }