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tree-wide: introduce new SOCKADDR_UN_LEN() macro, and use it everywhere

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The macro determines the right length of a AF_UNIX "struct sockaddr_un" to pass to
connect() or bind(). It automatically figures out if the socket refers to an
abstract namespace socket, or a socket in the file system, and properly handles
the full length of the path field.

This macro is not only safer, but also simpler to use, than the usual
offsetof() + strlen() logic.
This commit is contained in:
Lennart Poettering
2016-05-05 22:24:36 +02:00
parent d8fdc62037
commit fc2fffe770
23 changed files with 87 additions and 75 deletions
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2
src/udev/udev-ctrl.c
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@@ -105,7 +105,7 @@ struct udev_ctrl *udev_ctrl_new_from_fd(struct udev *udev, int fd) {
uctrl->saddr.un.sun_family = AF_LOCAL;
strscpy(uctrl->saddr.un.sun_path, sizeof(uctrl->saddr.un.sun_path), "/run/udev/control");
uctrl->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(uctrl->saddr.un.sun_path);
uctrl->addrlen = SOCKADDR_UN_LEN(uctrl->saddr.un);
return uctrl;
}