Socket Programming (connect() returns errorno = 38)

[Michael McGarry]

Hi,

I am using connect() to connect a socket. connect() returns -1 and
sets errno to 38. How can I find the error type associated with this
value (i.e., 38) in errno?

Thanks for any help,

Michael

 

[Seebs]

I am using connect() to connect a socket. connect() returns -1 and
sets errno to 38. How can I find the error type associated with this
value (i.e., 38) in errno?

strerror(errno)

Note that connect() isn't topical here (it's a system-specific feature),
but conveniently your question is about errno, which is portable (although
the specific value probably isn't).

My guess would be:

ENOTSOCK [38]: Socket operation on non-socket

which suggests that you've got a file descriptor wrong. One of the most
common mistakes causing that is to write something like:
x = syscall() != -1

after which x is set to either 0 or 1, because != is a boolean operator.

-s

 

[Ian Collins]

Hi,

I am using connect() to connect a socket. connect() returns -1 and
sets errno to 38. How can I find the error type associated with this
value (i.e., 38) in errno?

Search for it where it is defined, in errno.h.

 

[Ben Pfaff]

I am using connect() to connect a socket. connect() returns -1 and
sets errno to 38. How can I find the error type associated with this
value (i.e., 38) in errno?

strerror(38)

 

[Michael McGarry]

Thanks, perfect guess!!

I am using connect() to connect a socket. connect() returns -1 and
sets errno to 38. How can I find the error type associated with this
value (i.e., 38) in errno?

strerror(errno)

Note that connect() isn't topical here (it's a system-specific feature),
but conveniently your question is about errno, which is portable (although
the specific value probably isn't).

My guess would be:

ENOTSOCK [38]:         Socket operation on non-socket

which suggests that you've got a file descriptor wrong.  One of the most
common mistakes causing that is to write something like:
        x = syscall() != -1

after which x is set to either 0 or 1, because != is a boolean operator..

-s

 

[Phred Phungus]

strerror(38)

http://www.opengroup.org/onlinepubs/009695399/functions/strerror.html
--