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socket-util: cache result of socket_ipv6_is_supported()

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And while we are at it, log about unexpected errors.
This commit is contained in:
Lennart Poettering 2021-03-05 18:46:31 +01:00
parent b0ffd2760c
commit 571ec995fe
1 changed files with 16 additions and 3 deletions
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19
src/basic/socket-util.c
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@ -277,10 +277,23 @@ const char* socket_address_get_path(const SocketAddress *a) {
}
bool socket_ipv6_is_supported(void) {
if (access("/proc/net/if_inet6", F_OK) != 0)
return false;
static int cached = -1;
return true;
if (cached < 0) {
if (access("/proc/net/if_inet6", F_OK) < 0) {
if (errno != ENOENT) {
log_debug_errno(errno, "Unexpected error when checking whether /proc/net/if_inet6 exists: %m");
return false;
}
cached = false;
} else
cached = true;
}
return cached;
}
bool socket_address_matches_fd(const SocketAddress *a, int fd) {