Very Computer

by **Abdul Nasa** » Mon, 17 Feb 2003 21:40:17

Hi

Have anybody seen sendto() returns a zero instead of -1 or a positive
integer ?

I am getting this on NCR SVR4 ? What does this return value mean ? Man page
says it returns either of the above (-1 or number of bytes written) or those
predefined error codes.

Help will be highly appreciated.

regards
Abdul Nasser

by **Valentin Nechaye** » Mon, 17 Feb 2003 23:52:37

AN> Have anybody seen sendto() returns a zero instead of -1 or a positive
AN> integer ?

Some books says that old-styled SysV non-blocking i/o shows "would block"
not returning (-1,errno:=EAGAIN), but returning 0.
But this mode isn't set by O_NONBLOCK, but in another way (can't remember now
or find a resource)

AN> I am getting this on NCR SVR4 ? What does this return value mean ? Man page
AN> says it returns either of the above (-1 or number of bytes written) or those
AN> predefined error codes.
AN> Help will be highly appreciated.

Did you do any nonstandard control on this socket?

-netch-

by **Kurtis D. Rade** » Tue, 18 Feb 2003 03:22:43

> AN> Have anybody seen sendto() returns a zero instead of -1 or a positive
> AN> integer ?

> Some books says that old-styled SysV non-blocking i/o shows "would block"
> not returning (-1,errno:=EAGAIN), but returning 0. But this mode isn't
> set by O_NONBLOCK, but in another way (can't remember now or find a
> resource)

O_NDELAY, which should never be used because it also causes reads to return
zero making it problematic to distinguish EOF from the case where no data
is available at this time.

Very Computer

sendto() returns 0 on NCR SVR4

sendto() returns 0 on NCR SVR4

sendto() returns 0 on NCR SVR4

sendto() returns 0 on NCR SVR4