I use FreeBSD7.0,and use signal,like follows:
signal(SIGHUP,sig_hup);
signal(SIGIO,sig_io);
when I run call following code,it can run,but I find a puzzled question,it
should print some information,such as printf(execute main()) will print
execute main(),but in fact,printf fuction print none!!! Why printf function do
not go work?
my code is follows:
#include sys/ioctl.h
#include unp.h
static int sockfd;
#define QSIZE 8
#define MAXDG 4096
typedef struct{
void *dg_data;
size_t dg_len;
struct sockaddr *dg_sa;
socklen_t dg_salen;
}DG;
static DG dg[QSIZE];
static long cntread[QSIZE+1];
static int iget;
static int iput;
static int nqueue;
static socklen_t clilen;
static void sig_io(int);
static void sig_hup(int);
int main(int argc,char **argv){
printf(execute main());
int sockfd;
struct sockaddr_in servaddr,cliaddr;
sockfd=socket(AF_INET,SOCK_DGRAM,0);
bzero(servaddr,sizeof(servaddr));
servaddr.sin_family=AF_INET;
servaddr.sin_addr.s_addr=htonl(INADDR_ANY);
servaddr.sin_port=htons(SERV_PORT);
bind(sockfd,(SA *)servaddr,sizeof(servaddr));
dg_echo(sockfd,(SA *)cliaddr,sizeof(cliaddr));
}
void dg_echo(int sockfd_arg,SA *pcliaddr,socklen_t clilen_arg){
printf(called dg_echo);
int i;
const int on=1;
sigset_t zeromask,newmask,oldmask;
sockfd=sockfd_arg;
clilen=clilen_arg;
for(i=0;iQSIZE;i++){
dg[i].dg_data=malloc(MAXDG);
dg[i].dg_sa=malloc(clilen);
dg[i].dg_salen=clilen;
}
iget=iput=nqueue=0;
signal(SIGHUP,sig_hup);
signal(SIGIO,sig_io);
fcntl(sockfd,F_SETOWN,getpid());
ioctl(sockfd,FIOASYNC,on);
ioctl(sockfd,FIONBIO,on);
sigemptyset(zeromask);
sigemptyset(oldmask);
sigemptyset(newmask);
sigaddset(newmask,SIGIO);
sigprocmask(SIG_BLOCK,newmask,oldmask);
for(;;){
while(nqueue==0)
sigsuspend(zeromask);
sigprocmask(SIG_SETMASK,oldmask,NULL);
sendto(sockfd,dg[iget].dg_data,dg[iget].dg_len,0,dg[iget].dg_sa,dg[iget].dg_salen);
if(++iget=QSIZE)
iget=0;
sigprocmask(SIG_BLOCK,newmask,oldmask);
nqueue--;
}
}
static void sig_io(int signo){
printf(sig_io called);
ssize_t len;
int nread;
DG *ptr;
for(nread=0;;){
if(nqueue=QSIZE)
err_quit(receive overflow);
ptr=dg[iput];
ptr-dg_salen=clilen;
len=recvfrom(sockfd,ptr-dg_data,MAXDG,0,ptr-dg_sa,ptr-dg_salen);
if(len0){
if(errno==EWOULDBLOCK)
break;
else
err_sys(recvfrom error);
}
ptr-dg_len=len;
nread++;
nqueue++;
if(++iput=QSIZE)
iput=0;
}
cntread[nread]++;
}
static void sig_hup(int signo){
printf(sig_hup called);
int i;
for(i=0;i=QSIZE;i++)
printf(cntread[%d]=%ld\n,i,cntread[i]);
}
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