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20 lines
529 B
Groff
20 lines
529 B
Groff
24 years ago
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.TH socket_getifidx 3
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.SH NAME
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socket_getifidx \- get interface number
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.SH SYNTAX
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.B #include <socket.h>
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int \fBsocket_getifidx\fP(const char* \fIifname\fR);
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.SH DESCRIPTION
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socket_getifidx returns the interface number for a symbolic network
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interface name (like "eth0" on Linux, for example).
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The interface number can be used as scope_id for IPv6 communications on
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link-local addresses.
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If something goes wrong, socket_getifidx returns -1, setting errno
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appropriately.
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.SH "SEE ALSO"
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socket_getifname(3), socket_connect6(3)
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