wehub-resource-sync
40 lines
1.5 KiB
C
40 lines
1.5 KiB
C
/*
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* Copyright © 2026 Apple Inc. and the Containerization project authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __CZ_TAP_H
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#define __CZ_TAP_H
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#include <stddef.h>
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/*
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* Open /dev/net/tun, ioctl(TUNSETIFF) with IFF_TAP|IFF_NO_PI, and write the
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* resolved interface name into `out_name` (must be at least 16 bytes).
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*
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* If `requested_name` is non-NULL and non-empty, it is the desired name; the
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* kernel may rename it on collision (rare). If NULL or empty, the kernel
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* picks a name like "tap%d".
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*
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* Returns the open fd on success, -errno on failure.
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*
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* Linux-only — the implementation in cz_tap.c is gated on __linux__. The
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* declaration is left unconditional so Swift's clang importer can see it
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* regardless of whose target's preprocessor defines reach the modulemap.
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* On non-Linux targets the symbol is not provided; do not call.
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*/
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int cz_tap_create(const char *requested_name, char *out_name, size_t out_name_len);
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#endif /* __CZ_TAP_H */
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