Standards
| Standards / Extensions |
C or C++ |
Dependencies |
|---|
| z/OS® UNIX |
both |
|
Format
#define _OPEN_SYS_SOCK_EXT
#include <sys/types.h>
#include <socket.h>
int takesocket(struct clientid *clientid, int sdesc);
General
description
The takesocket() function acquires a socket from another program.
Typically, the other program passes its client ID and socket descriptor,
and/or process id (PID), to your program through your program's startup
parameter list.
- Parameter
- Description
- clientid
- A pointer to the clientid of the application from which
you are taking a socket.
- sdesc
- The descriptor of the socket to be taken.
If your program is using the PID to ensure integrity between givesocket()
and takesocket(), before issuing the takesocket() call, your program
should set the c_pid.pid field of the clientid structure
to the PID of the giving program (that is, program that issued the
givesocket() call). This identifies the process from which the socket
is to be taken. If the c_reserved.type field of the clientid
structure was set to SO_CLOSE on the givesocket() call, c_close.SockToken of
clientid structure should be used as input to takesocket() instead
of the normal socket descriptor. See givesocket() — Make the specified socket available for a description
of the clientid structure.
Returned value
If successful, takesocket() returns the new socket descriptor.
If unsuccessful, takesocket() returns -1 and sets errno to one
of the following values:
- Error Code
- Description
- EACCES
- The other application did not give the socket to your application.
- EBADF
- The sdesc parameter does not specify a valid socket
descriptor owned by the other application, or the socket has already
been taken.
- EFAULT
- Using the clientid parameter as specified would result
in an attempt to access storage outside the caller's address space.
- EINVAL
- The clientid parameter does not specify a valid client
identifier. Either the client process cannot be found, or the client
exists, but has no outstanding givesockets.
- EMFILE
- The socket descriptor table is already full.