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printf(\ lseek(fd,0,SEEK_SET); ftruncate(fd,8); num=read(fd,buf2,8); if(num!=8) printf(\ write(1,buf2,8); close(fd); }

4£®ÊµÏÖ¡°catÎļþÃû¡±ÏÔʾÎļþÄÚÈÝ #include

main(int argc,char *argv[]) {

int fd; int num; char buf[10]; if(argc!=2) {

printf(\ exit(1); }

fd=open(argv[1],O_RDONLY); if(fd==-1) {

perror(\ exit(1); }

while((num=read(fd,buf,10))!=0) write(1,buf,num); close(fd); }

5£®ÊµÏÖ¡°cp Ô­Îļþ Ä¿±êÎļþ¡± #include #include

main(int argc,char *argv[]) {

int from,to; int num; char buf[10]; if(argc!=3) {

printf(\ exit(1); }

from=open(argv[1],O_RDONLY);

to=open(argv[2],O_WRONLY|O_CREAT|O_TRUNC,0644); num=read(from,buf,10); while(num!=0) { write(to,buf,num); num=read(from,buf,10); }

close(from); close(to); }

6£®±àд³ÌÐòpro3.c£¬½«×Ö·û´®¡°hello world¡±Í¨¹ýÊä³öÖض¨Ïò·½Ê½Ð´ÈëÎļþf1ÖÐ #include #include #include #include #include main() { int fd; if((fd=open(\Y|O_CREAT,0644))==-1) perror(\ if(dup2(fd,1)==-1) perror(\ printf(\ close(fd); }

7£®Ê¹ÓÃfork´´½¨½ø³Ì£¬ÔÚ×Ó½ø³ÌÖдòÓ¡¡°I am the child¡±ºÍ×Ó½ø³Ìpid£¬ÔÚ¸¸½ø³ÌÖдòÓ¡¡°I am the father¡±ºÍ¸¸½ø³Ìpid #include #include #include int main() {

pid_t pid; pid = fork(); if(pid < 0) {

perror(\ exit(1); }

else if(pid == 0)

printf(\ else

printf(\ exit(0); }

8£®´´½¨×Ó½ø³Ì£¬ÔÚ×Ó½ø³ÌÖÐÖ´ÐС°ps -A¡±ÃüÁ¸¸½ø³ÌµÈ´ý×Ó½ø³Ì½áÊøºó´òÓ¡¡°child over¡± ¼°Ëù´¦ÀíµÄ×Ó½ø³Ì½ø³ÌºÅ #include #include main() { pid_t pid,cpid; int i; char* args[64]; args[0]=¡±ps¡±; args[1]=¡±-A¡±; args[2]=NULL; pid=fork(); if(pid<0) { perror(¡°fork¡±); exit(1); } else if(pid==0) { execvp(args[0],args); exit(0); } else { cpid=wait(NULL); printf(¡°child over! cpid=%d\\n¡±,cpid); } }

9£®±àд³ÌÐò´¦ÀíSIGINTÐźţ¬µ±³ÌÐò½ÓÊÕµ½SIGINTÐźźóÊä³ö¡°SIGINT is caught¡± #include #include

void signal_handler(int signum) {

switch(signum) {

case SIGINT:

printf(\ break; } }

int main() {

signal(SIGINT,signal_handler); pause(); return 0; }

10£®Ê¹ÓÃPIPEʱÏÞ¸¸×Ó½ø³ÌÏò×Ó½ø³Ì·¢ËÍ1234567890£¬×Ó½ø³Ì½ÓÊÕ²¢ÏÔʾ #include #include main() {

int pfd[2]; char buf[32]; pid_t pid; pipe(pfd);

if((pid=fork())<0) perror(\ else if(pid>0) {

close(pfd[0]);

write(pfd[1],\ } else {

close(pfd[1]);

read(pfd[0],buf,11);

printf(\ } }