csapp.c

我实现的C重新封装。。。。。。。。。。。。。。。。。。。。

#include "csapp.h"

void unix_error(char *msg){
	fprintf(stderr,"%s:%s\n",msg,strerror(errno));
	exit(0);
}

void posix_error(int code,char *msg){
	fprintf(stderr,"%s:%s\n",msg,strerror(code));
	exit(0);
}

void dns_error(char *msg){
	fprintf(stderr,"%s:DNS error %d\n",msg,h_errno);
	exit(0);
}

void app_error(char *msg){
	fprintf(stderr,"%s\n",msg);
	exit(0);
}


pid_t Fork(void){
	pid_t pid;
	
	if((pid = fork()) < 0)
		unix_error("Fork error");
	return pid;
}

void Execve(const char *filename,char *const argv[],char *const envp[]){
	if(execve(filename,argv,envp) < 0)
		unix_error("Execve error");
}

pid_t Wait(int *status){
	pid_t pid;

	if((pid = wait(status)) < 0)
		unix_error("Wait error");
	return pid;
}

pid_t Waitpid(pid_t pid,int *iptr,int options){
	pid_t retpid;

	if((retpid = waitpid(pid,iptr,options)) < 0)
		unix_error("Waitpid error");
	return(retpid);
}

void Kill(pid_t pid,int signum){
	int rc;

	if((rc = kill(pid,signum)) < 0)
		unix_error("Kill error");
}

void Pause(){
	(void)pause();
	return;
}

unsigned int Sleep(unsigned int secs){
	unsigned int rc;

	if((rc = sleep(secs)) < 0)
		unix_error("Sleep error");
	return rc;
}

unsigned int Alarm(unsigned int seconds){
	return alarm(seconds);
}

void Setpgid(pid_t pid,pid_t pgid){
	int rc;

	if((rc = strpgid(pid,pgid)) < 0)
		unix_error("Setpgid error");
	return;
}

pid_t Getpgrp(void){
	return getpgrp();
}


handler_t *Signal(int signum,handler_t *handler){
	struct sigaction action,old_action;

	action.sa_handler = handler;
	sigemptyset(&action.sa_mask);
	action.sa_flags = SA_RESTART;
	if(sigaction(signum,&action,&old_action) < 0)
		unix_error("Signal error");
	return(old_action.sa_handler);
}

void Sigprocmask(int how,const sigset_t *set,sigset_t *oldest){
	if(sigprocmask(how,set,oldset) < 0)
		unix_error("Sigprocmask error");
	return;
}