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| getsockopt() |
| SO_RCVBUF | Returns the buffer size of a socket's receive |
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| socket buffer. The default buffer size is 4096 |
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| bytes. A stream socket's buffer size can be |
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| increased or decreased only prior to |
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| establishing a connection. |
| SO_SNDBUF | Returns the buffer size of a socket's send |
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| socket buffer. The default buffer size is 4096 |
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| bytes. A stream socket's buffer size can be |
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| increased or decreased only prior to |
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| establishing a connection. |
| The following options are supported for •TCP" level | |
| (IPPROTO_TCP) options: | |
| TCP_MAXSEG | Returns the maximum segment size in use for |
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| the socket. The value for this option can only |
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| be examined, it cannot be set. If the socket is |
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| not yet connected, TCP returns a default size |
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| of 512 bytes. |
| TCP_NODELAY | (Toggle option) Instructs TCP to send data as |
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| soon as it receives it and to bypass the |
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| buffering algorithm that tries to avoid |
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| numerous small packets from being sent to |
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| the network. |
optval | Byte pointer to a variable into which an option value is | |
| returned. optval returns a NULL if the option information is | |
| not of interest and not to be passed to the calling process. | |
| Although optval is typed as (char *), the value that it | |
| points to is not terminated by \0. | |
optlen | Pointer to a variable containing the maximum number of bytes | |
| to be returned by optval. | |
On return, it contains the actual number of bytes returned by optval.
Berkeley Software Distribution Interprocess Communication 47