Add IPv6 support to getifaddrs() on Bsd #1436
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jart
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Jan 19, 2026
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Wow this is great. I wish Linux had this! Thank you for doing this.
| libcesque uint16_t bswap_16(uint16_t) pureconst; | ||
| libcesque uint32_t bswap_32(uint32_t) pureconst; | ||
| libcesque uint64_t bswap_64(uint64_t) pureconst; | ||
| libcesque uint128_t bswap_128(uint128_t) pureconst; |
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I recommend putting this line behind an ifdef like:
#ifdef _COSMO_SOURCE
#if (__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0) >= 406 || defined(__llvm__)
// ...
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I added the guards, I wish Linux had an easy way to get ipv6 info aswell
This greatly helps for IPv6 endianess convertion
Tested on x86_64 MacOs OpenBsd FreeBsd and NetBsd. There is extra ioctl calls on the ipv6 bsd path because SIOCGIFCONF doesn't returns the addr flag or the netmask. Luckily all bsd systems share the same values for SIOCGIFAFLAG_IN6 and SIOCGIFNETMASK_IN6.
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Tested on x86_64 MacOs OpenBsd FreeBsd and NetBsd.
There is extra ioctl calls on the ipv6 bsd path
because SIOCGIFCONF doesn't returns the addr flag
or the netmask.
Luckily all bsd systems share the same values for
SIOCGIFAFLAG_IN6 and SIOCGIFNETMASK_IN6.