c0806d1b64
lwIP 2.2.0, fetched by ports/lwip and compiled straight into the kernel. Not written from scratch, and the reason is not the packet formats: it is congestion control, retransmission, window management and twenty years of corner cases that only show up against a real peer. Not FreeBSD's netinet either, though the licence would have allowed it -- that stack is not a library, it reaches into mbufs, epoch(9), netisr, VNET and uma(9), so adopting it means porting FreeBSD's kernel infrastructure first. lwIP was written for exactly this situation: a small kernel with a raw Ethernet driver and a port layer of a few hundred lines. It is kernel code, so nothing is installed into the sysroot and there is no second build system: the top-level Makefile compiles the files it wants against our port headers. The file list is explicit rather than a wildcard, because lwIP ships IPv6, 6LoWPAN, PPP, SLIP, DNS-SD and a dozen apps in the same tree, and building what is not configured yields either dead code or a link error naming a port function nobody meant to write. Its sources are unmodified and its warnings are silenced for its files only -- patching them would mean maintaining a fork. The port layer is ours: a lock, a clock, the netif that hands frames to e1000, lwipopts.h, and a shim/ directory of tiny headers so lwIP's <string.h> and friends resolve to the kernel's functions instead of the host's, whose prototypes disagree and would otherwise be found on the default include path. NO_SYS=1, so lwIP has no threads of its own and one kernel thread feeds it. A thread rather than the interrupt handler, because a call into lwIP can reach the driver, the driver can sleep, and an interrupt handler cannot -- so the interrupt still only clears the cause register and the thread polls. kthread_create is new and generally useful: a process with a kernel-only page directory, no files, no cwd, no parent, dispatched from forkret, which can therefore sleep and be preempted like anything else. DHCP obtains an address at boot and the console says which one. AF_INET went in exactly where phase 2 said it would. socknew dispatches on the domain, kernel/net/inet.c implements the internet side on lwIP's raw API, and not one syscall changed shape: bind, connect, listen, accept, read and write reach the same descriptors they always did. TCP and UDP both work. cmd/nettest opens a connection, writes, and reads the answer back. Two things are owed and named here so they are not discovered later: recvfrom does not yet report the source address, and the socket paths poll on the timer tick instead of sleeping on the socket. Both are follow-ups, not redesigns. NOTICE carries lwIP's BSD-3 text. Clause 3 is no-endorsement, not the old advertising clause, so it sits with Apache-2.0 without difficulty. Verified: the tree builds clean, and the headless boot check passes with 27 [ok] and no failures with the stack compiled in and the thread running -- which is the part that would break first if netinit deadlocked or the thread starved anything. An end-to-end connection test belongs in that suite and is the next commit. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
63 lines
3.1 KiB
C
63 lines
3.1 KiB
C
// Error numbers, matching the Linux x86_64 ABI values so that musl-linked
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// programs interpret syscall failures correctly. Kernel code returns these
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// negated (e.g. `return -ENOSYS;`), exactly like Linux does internally.
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#ifndef SCHOS_ERRNO_H
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#define SCHOS_ERRNO_H
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#define EPERM 1 // Operation not permitted
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#define ENOENT 2 // No such file or directory
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#define ESRCH 3 // No such process
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#define EINTR 4 // Interrupted system call
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#define EIO 5 // I/O error
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#define ENXIO 6 // No such device or address
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#define E2BIG 7 // Argument list too long
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#define ENOEXEC 8 // Exec format error
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#define EBADF 9 // Bad file descriptor
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#define ECHILD 10 // No child processes
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#define EAGAIN 11 // Try again
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#define ENOMEM 12 // Out of memory
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#define EACCES 13 // Permission denied
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#define EFAULT 14 // Bad address
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#define ENOTBLK 15 // Block device required
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#define EBUSY 16 // Device or resource busy
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#define EEXIST 17 // File exists
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#define EXDEV 18 // Cross-device link
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#define ENODEV 19 // No such device
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#define ENOTDIR 20 // Not a directory
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#define EISDIR 21 // Is a directory
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#define EINVAL 22 // Invalid argument
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#define ENFILE 23 // File table overflow
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#define EMFILE 24 // Too many open files
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#define ENOTTY 25 // Not a typewriter
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#define EFBIG 27 // File too large
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#define ENOSPC 28 // No space left on device
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#define ESPIPE 29 // Illegal seek
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#define EROFS 30 // Read-only file system
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#define EMLINK 31 // Too many links
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#define EPIPE 32 // Broken pipe
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#define ERANGE 34 // Math result not representable
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#define ENAMETOOLONG 36 // File name too long
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#define ENOSYS 38 // Function not implemented
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#define ENOTEMPTY 39 // Directory not empty
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#define ELOOP 40 // Too many symbolic links encountered
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// Sockets. Same Linux x86_64 values, so strerror() in a musl-linked program
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// prints the message the programmer expected rather than a neighbouring one.
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#define ENOTSOCK 88 // Socket operation on non-socket
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#define EDESTADDRREQ 89 // Destination address required
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#define EMSGSIZE 90 // Message too long
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#define EPROTOTYPE 91 // Protocol wrong type for socket
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#define ENOPROTOOPT 92 // Protocol not available
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#define EPROTONOSUPPORT 93 // Protocol not supported
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#define EOPNOTSUPP 95 // Operation not supported on transport endpoint
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#define EAFNOSUPPORT 97 // Address family not supported by protocol
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#define EADDRINUSE 98 // Address already in use
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#define EADDRNOTAVAIL 99 // Cannot assign requested address
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#define ECONNRESET 104 // Connection reset by peer
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#define EISCONN 106 // Transport endpoint is already connected
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#define ENODATA 61 // No data available -- no such attribute
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#define ENOBUFS 105 // No buffer space available
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#define ENOTCONN 107 // Transport endpoint is not connected
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#define ECONNREFUSED 111 // Connection refused
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#endif // SCHOS_ERRNO_H
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