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feat: POSIX libc surface, native binutils (as/ld/ar run on MontaukOS)

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Grow the Montauk libc enough to cross-build binutils 2.43.1 with
--host=x86_64-montauk. gas, ld, ar, nm, objcopy, objdump, readelf,
ranlib, strip and friends now link as native ET_EXEC Montauk binaries
(staged stripped in toolchain/native/, not yet shipped in the image).

New libc surface: full Linux errno and signal sets, O_* flags with
real O_EXCL/O_APPEND semantics, unlink/rmdir/dup/dup2/getpid/_exit,
kill (SYS_KILL), fcntl, fileno/fdopen, putc/getchar/rewind,
ctime/asctime, strtoll/strtoull/atoll, bsearch, mkstemp/mktemp,
realpath (lexical, drive-prefix aware), mbstowcs/mblen, chmod/fchmod/
umask/utime no-ops (VFS has no modes or settable times), full struct
stat with fake inodes, sscanf field widths (bounded conversions),
SCN*/PRI* completions, wait/waitpid over SYS_WAITPID, and new headers
sys/wait.h, sys/param.h, utime.h, wchar.h, memory.h.

fork/exec/pipe are declared but fail with ENOSYS: binutils never
spawns, and real process plumbing is the posix_spawn milestone, which
needs kernel support (exit status reporting, fd redirection).

TCC's montauk_compat.h shims (unlink, chmod, execvp, realpath, fdopen,
strtoll, strtoull) are retired in favor of the libc versions.

Co-Authored-By: Claude Fable 5 <[email protected]>
This commit is contained in:
daniel
2026-07-14 10:55:39 +02:00
co-authored by Claude Fable 5
parent 648f7111c0
commit bd9158fdcc
24 changed files with 875 additions and 136 deletions
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programs/include/libc/sys/stat.h
+40 -5
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@@ -12,19 +12,54 @@ extern "C" {
#define S_IFMT 0170000
#define S_IFDIR 0040000
#define S_IFREG 0100000
#define S_IFCHR 0020000
#define S_IFLNK 0120000
#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)
#define S_ISFIFO(mode) (0)
#define S_ISSOCK(mode) (0)
#define S_ISBLK(mode) (0)
/* Permission bits are accepted and preserved by the API for POSIX
compatibility, but the Montauk VFS does not store them. */
#define S_IRWXU 0700
#define S_IRUSR 0400
#define S_IWUSR 0200
#define S_IXUSR 0100
#define S_IRWXG 0070
#define S_IRGRP 0040
#define S_IWGRP 0020
#define S_IXGRP 0010
#define S_IRWXO 0007
#define S_IROTH 0004
#define S_IWOTH 0002
#define S_IXOTH 0001
struct stat {
unsigned long st_dev;
unsigned long st_ino;
mode_t st_mode;
unsigned long st_nlink;
uid_t st_uid;
gid_t st_gid;
unsigned long st_size;
unsigned long st_blksize;
unsigned long st_blocks;
time_t st_atime;
time_t st_mtime;
time_t st_ctime;
};
int mkdir(const char *path, unsigned int mode);
int stat(const char *path, struct stat *buf);
int fstat(int fd, struct stat *buf);
int mkdir(const char *path, unsigned int mode);
int stat(const char *path, struct stat *buf);
int fstat(int fd, struct stat *buf);
int lstat(const char *path, struct stat *buf);
int chmod(const char *path, mode_t mode);
int fchmod(int fd, mode_t mode);
mode_t umask(mode_t mask);
#ifdef __cplusplus
}