Re: why printf() don't work?
trying putting newlines in the strings like this:
receive overflow\n
- Original Message -
From: Edward King zhan...@neusoft.com
To: freebsd-questions@freebsd.org
Sent: Monday, January 5, 2009 2:29:23 AM GMT -05:00 US/Canada Eastern
Subject: why printf() don't work?
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;i
=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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Re: why printf() don't work?
On Mon, 5 Jan 2009 15:12:12 + (UTC), Tom Marchand m0rch...@comcast.net wrote: trying putting newlines in the strings like this: receive overflow\n You can add fflush(stdout); to force the output, even if no \n is appended. But as it has been mentioned before, don't forget to #include stdio.h :-) -- Polytropon From Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ... ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: why printf() don't work?
On January 5, 2009 02:29:23 am Edward King wrote:
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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I think you need #include stdio.h
--
Mike Jeays
http://www.jeays.ca
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Re: why printf() don't work?
Le Mon, 05 Jan 2009 15:29:23 +0800, Edward King zhan...@neusoft.com a écrit : 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? Just to be sure : You should not use printf() in a signal handler, it is not considered 'signal safe'. (See man sigaction) Regards. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
why printf() don't work?
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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Confidentiality Notice: The information contained in this e-mail and any
accompanying attachment(s)
is intended only for the use of the intended recipient and may be confidential
and/or privileged of
Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of
this communication is
not the intended recipient, unauthorized use, forwarding, printing, storing,
disclosure or copying
is strictly prohibited, and may be unlawful.If you have received this
communication in error,please
immediately notify the sender by return e-mail, and delete the original message
and all copies from
your system. Thank you.
---
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