August 18, 2002 SHUTDOWN 2

### NAME

shutdown - shut down part of a full-duplex connection

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```int` shutdown(```int s``, int how`)

### DESCRIPTION

The shutdown(``) call causes all or part of a full-duplex connection on the socket associated with ```s` to be shut down. The ```how` argument specifies which part of the connection will be shut down. Permissible values are:

SHUT_RD
  further receives will be disallowed.

SHUT_WR
  further sends will be disallowed.

SHUT_RDWR
  further sends and receives will be disallowed.

### RETURN VALUES

A 0 is returned if the call succeeds, -1 if it fails.

### ERRORS

The call succeeds unless:

[```EBADF`]
  ```s` is not a valid descriptor.

[```EINVAL`]
  The ```how` argument is invalid.

[```ENOTCONN`]
  The specified socket is not connected.

[```ENOTSOCK`]
  ```s` is a file, not a socket.

### SEE ALSO

connect(2), socket(2)

### HISTORY

The shutdown(``) function call appeared in 4.2BSD. The ```how` arguments used to be simply 0, 1, and 2, but now have named values as specified by X/Open Portability Guide Issue 4 (``XPG4'') .