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Date:      Mon, 5 Jan 2009 15:12:12 +0000 (UTC)
From:      Tom Marchand <>
Subject:   Re: why printf() don't work?
Message-ID:  <>
In-Reply-To: <022201c96f07$553b65a0$3f83a8c0@user863c0bf569>

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trying putting newlines in the strings like this:=20

=C2=A0 =C2=A0"receive overflow\n"=20

----- Original Message -----=20
From: "Edward King" <>=20
Sent: Monday, January 5, 2009 2:29:23 AM GMT -05:00 US/Canada Eastern=20
Subject: why printf() don't work?=20

I use FreeBSD7.0,and use signal,like follows: signal(SIGHUP,sig_hup); signa=
l(SIGIO,sig_io); when I run call following code,it can run,but I find a puz=
zled 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 typ=
edef 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; stat=
ic void sig_io(int); static void sig_hup(int); int main(int argc,char **arg=
v){ printf("execute main()"); int sockfd; struct sockaddr_in servaddr,cliad=
dr; sockfd=3Dsocket(AF_INET,SOCK_DGRAM,0); bzero(&servaddr,sizeof(servaddr)=
); servaddr.sin_family=3DAF_INET; servaddr.sin_addr.s_addr=3Dhtonl(INADDR_A=
NY); servaddr.sin_port=3Dhtons(SERV_PORT); bind(sockfd,(SA *)&servaddr,size=
of(servaddr)); dg_echo(sockfd,(SA *)&cliaddr,sizeof(cliaddr)); } void dg_ec=
ho(int sockfd_arg,SA *pcliaddr,socklen_t clilen_arg){ printf("called dg_ech=
o"); int i; const int on=3D1; sigset_t zeromask,newmask,oldmask; sockfd=3Ds=
ockfd_arg; clilen=3Dclilen_arg; for(i=3D0;i =3DQSIZE) iget=3D0; 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=3D0;;)=
{ if(nqueue>=3DQSIZE) err_quit("receive overflow"); ptr=3D&dg[iput]; ptr->d=
g_salen=3Dclilen; len=3Drecvfrom(sockfd,ptr->dg_data,MAXDG,0,ptr->dg_sa,&pt=
r->dg_salen); if(len<0){ if(errno=3D=3DEWOULDBLOCK) break; else err_sys("re=
cvfrom error"); } ptr->dg_len=3Dlen; nread++; nqueue++; if(++iput>=3DQSIZE)=
 iput=3D0; } cntread[nread]++; } static void sig_hup(int signo){ printf("si=
g_hup called"); int i; for(i=3D0;i<=3DQSIZE;i++) printf("cntread[%d]=3D%ld\=
n",i,cntread[i]); } -------------------------------------------------------=
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