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udev works: /sys device tree, uevent netlink, datagram sockets with per-message credentials

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Kernel devices (input, mem, tty, graphics, block) get /sys/devices/virtual
entries with dev/uevent/subsystem, /sys/class and /sys/dev links, input
capabilities, and writable uevent files that announce on the netlink socket.
eudev now runs, processes a full trigger and settles.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EVRhxi9zpdW2uDUN4FVcao
This commit is contained in:
Nexoniarz 2026-10-26 11:39:13 +01:00
commit 5d4d318ebf
10 changed files with 813 additions and 37 deletions
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21
kernel/fs/devfs.c
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@ -274,6 +274,25 @@ static int
devfs_read(struct inode *ip, int u, uint64 d, uint64 o, uint n)
{
int x = extra_of(ip->inum);
// mkdir lays down the "." and ".." of a v1-style directory by reading and
// rewriting its first two entries (build_dir_tree). A directory here has
// none stored, so the read gives zeros and the write is swallowed.
if (x >= 0 && ip->type == T_DIR) {
char z[64];
memset(z, 0, sizeof z);
for (uint done = 0; done < n; ) {
uint c = n - done < sizeof z ? n - done : (uint)sizeof z;
if (u) {
if (copy_to_user(d + done, z, c) < 0)
return -EFAULT;
} else {
memmove((char *)d + done, z, c);
}
done += c;
}
(void)o;
return (int)n;
}
if (x < 0 || ip->type != T_SYMLINK)
return -1;
extras_init();
@ -300,6 +319,8 @@ static int
devfs_write(struct inode *ip, int u, uint64 s, uint64 o, uint n)
{
int x = extra_of(ip->inum);
if (x >= 0 && ip->type == T_DIR)
return (int)n; // see devfs_read
if (x < 0 || ip->type != T_SYMLINK || o != 0 || n >= EXTRA_TARGET)
return -1;
extras_init();