why error: "accept: Invalid argument"

[Yarco]

when doing fork in a loop:

while(1) {
tmp_sd = accept(sd, (struct sockaddr*)&tmp_sin, &len);
if (tmp_sd == -1) {
perror("accept");
exit(0);
}
 
//check client ip
 
//fork
pid = fork();
switch(pid) {
case -1:
perror("fork");
break;
case 0:
_exit(0);
}
 
close(tmp_sd);
}
 

If there's no fork, the code done well.
But if fork, when telnet, it has error: accept: Invalid argument
Thanks a lot.

[Michael Mair]

Yarco wrote:

when doing fork in a loop:

         while(1) {
                 tmp_sd = accept(sd, (struct sockaddr*)&tmp_sin, &len);
                 if (tmp_sd == -1) {
                         perror("accept");
                         exit(0);
                 }

                 //check client ip

                 //fork
                 pid = fork();
                 switch(pid) {
                         case -1:
                                 perror("fork");
                                 break;
                         case 0:
                                 _exit(0);
                 }

                 close(tmp_sd);
         }
 

If there's no fork, the code done well.
But if fork, when telnet, it has error: accept: Invalid argument

Platform or compiler specific questions are best asked in a
newsgroup where they are topical.
There are no functions accept(), perror(), fork(), close(), and
_exit() in standard C, so I won't say anything about their use.
comp.unix.progr ammer might be a good place to ask.

Your switch definitely lacks a default, though, to ward against
unexpected pid values. printf() debug from there...
Cheers
Michael
--
E-Mail: Mine is an /at/ gmx /dot/ de address.

[Yarco]

Thanks

[Gary Baydo]

On Wed, 16 Nov 2005 06:02:15 +0100, Michael Mair wrote:

Yarco wrote:

when doing fork in a loop:

         while(1) {
                 tmp_sd = accept(sd, (struct sockaddr*)&tmp_sin, &len);
                 if (tmp_sd == -1) {
                         perror("accept");
                         exit(0);
                 }

                 //check client ip

                 //fork
                 pid = fork();
                 switch(pid) {
                         case -1:
                                 perror("fork");
                                 break;
                         case 0:
                                 _exit(0);
                 }

                 close(tmp_sd);
         }
 

If there's no fork, the code done well.
But if fork, when telnet, it has error: accept: Invalid argument

Platform or compiler specific questions are best asked in a
newsgroup where they are topical.
There are no functions accept(), perror(), fork(), close(), and
_exit() in standard C, so I won't say anything about their use.

[snip]

Isn't perror() part of the standard? It's declared in stdio.h.

Regards,
Gary

[pete]

Gary Baydo wrote:

Isn't perror() part of the standard? It's declared in stdio.h.

perror() is in the standard library.

--
pete

[Michael Mair]

Gary Baydo wrote:

On Wed, 16 Nov 2005 06:02:15 +0100, Michael Mair wrote:

Yarco wrote:

when doing fork in a loop:

        while(1) {
                tmp_sd = accept(sd, (struct sockaddr*)&tmp_sin, &len);
                if (tmp_sd == -1) {
                        perror("accept");
                        exit(0);
                }

                //check client ip

                //fork
                pid = fork();
                switch(pid) {
                        case -1:
                                perror("fork");
                                break;
                        case 0:
                                _exit(0);
                }

                close(tmp_sd);
        }

If there's no fork, the code done well.
But if fork, when telnet, it has error: accept: Invalid argument

Platform or compiler specific questions are best asked in a
newsgroup where they are topical.
There are no functions accept(), perror(), fork(), close(), and
_exit() in standard C, so I won't say anything about their use.

[snip]

Isn't perror() part of the standard? It's declared in stdio.h.

You are right, thanks for the correction. I got carried away
before breakfast... I really should enforce my "no newsgroups
before caffeine" policy.

Cheers
Michael
--
E-Mail: Mine is an /at/ gmx /dot/ de address.

[A.A]

>tmp_sd = accept(sd, (struct sockaddr*)&tmp_ sin, &len);
int
accept(int s,
struct sockaddr * restrict addr,
socklen_t * restrict addrlen);
///////////////////////////////////////
case 0: {
(void)printf("t est........?");
_exit(0);
}

[A.A]

>tmp_sd = accept(sd, (struct sockaddr*)&tmp_ sin, &len);
int
accept(int s,
struct sockaddr * restrict addr,
socklen_t * restrict addrlen);
///////////////////////////////////////
case 0: {
(void)printf("t est........?");
_exit(0);
}

[A.A]

>tmp_sd = accept(sd, (struct sockaddr*)&tmp_ sin, &len);
int
accept(int s,
struct sockaddr * restrict addr,
socklen_t * restrict addrlen);
///////////////////////////////////////
case 0: {
(void)printf("t est........?");
_exit(0);
}

[A.A]

>tmp_sd = accept(sd, (struct sockaddr*)&tmp_ sin, &len);
int
accept(int s,
struct sockaddr * restrict addr,
socklen_t * restrict addrlen);
///////////////////////////////////////
case 0: {
(void)printf("t est........?");
_exit(0);
}