feat(pkcl): POSIX 互換層 pkcl と、Foundation 上で動く BusyBox

foundation/include/pkcl-nolibc/errno.h

@@ -0,0 +1,46 @@
+#ifndef PKCL_ERRNO_H
+#define PKCL_ERRNO_H
+
+/* pkcl の errno（doc/spec_pkcl.md §5）。値は Newlib の sys/errno.h と同じで、
+ * 後から Newlib を載せても数値が食い違わない。単一のグローバルで、スレッドごとではない。 */
+extern int errno;
+
+#define EPERM 1
+#define ENOENT 2
+#define EINTR 4
+#define EIO 5
+#define ENOEXEC 8
+#define EBADF 9
+#define ECHILD 10
+#define EAGAIN 11
+#define EWOULDBLOCK EAGAIN
+#define ENOMEM 12
+#define EACCES 13
+#define EFAULT 14
+#define EBUSY 16
+#define EEXIST 17
+#define EXDEV 18
+#define ENODEV 19
+#define ENOTDIR 20
+#define EISDIR 21
+#define EINVAL 22
+#define ENFILE 23
+#define EMFILE 24
+#define ENOTTY 25
+#define EFBIG 27
+#define ENOSPC 28
+#define ESPIPE 29
+#define EROFS 30
+#define EPIPE 32
+#define EDOM 33
+#define ERANGE 34
+#define ENOSYS 88
+#define ENOTEMPTY 90
+#define ENAMETOOLONG 91
+#define ELOOP 92
+#define EPROTO 71
+#define ENOTSUP 134
+#define EOVERFLOW 139
+#define ETIMEDOUT 116
+
+#endif

foundation/include/pkcl-nolibc/fcntl.h

@@ -0,0 +1,29 @@
+#ifndef PKCL_FCNTL_H
+#define PKCL_FCNTL_H
+#include <sys/types.h>
+
+/* 値は Newlib の sys/_default_fcntl.h と同じ。 */
+#define O_RDONLY 0
+#define O_WRONLY 1
+#define O_RDWR 2
+#define O_ACCMODE 3
+#define O_APPEND 0x0008
+#define O_CREAT 0x0200
+#define O_TRUNC 0x0400
+#define O_EXCL 0x0800
+#define O_NONBLOCK 0x4000
+#define O_CLOEXEC 0x40000
+#define O_DIRECTORY 0x200000
+
+#define F_DUPFD 0
+#define F_GETFD 1
+#define F_SETFD 2
+#define F_GETFL 3
+#define F_SETFL 4
+#define FD_CLOEXEC 1
+
+int open(const char *path, int flags, ...);
+int creat(const char *path, mode_t mode);
+int fcntl(int fd, int cmd, ...);
+
+#endif

foundation/include/pkcl-nolibc/sys/stat.h

@@ -0,0 +1,55 @@
+#ifndef PKCL_SYS_STAT_H
+#define PKCL_SYS_STAT_H
+#include <sys/types.h>
+
+#define S_IFMT 0170000
+#define S_IFDIR 0040000
+#define S_IFCHR 0020000
+#define S_IFREG 0100000
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#define S_ISBLK(m) 0
+#define S_ISFIFO(m) 0
+#define S_ISLNK(m) 0
+#define S_ISSOCK(m) 0
+
+#define S_IRUSR 0400
+#define S_IWUSR 0200
+#define S_IXUSR 0100
+#define S_IRWXU 0700
+#define S_IRGRP 0040
+#define S_IWGRP 0020
+#define S_IXGRP 0010
+#define S_IRWXG 0070
+#define S_IROTH 0004
+#define S_IWOTH 0002
+#define S_IXOTH 0001
+#define S_IRWXO 0007
+
+/* FS2 に inode 番号・リンク数・GID・atime はない。st_ino は 0、st_nlink は 1、
+ * st_gid は 0、st_rdev は 0、st_blksize は 512、st_atime は st_mtime と同じ（doc/spec_pkcl.md §6.3）。 */
+struct stat {
+    dev_t st_dev;
+    ino_t st_ino;
+    mode_t st_mode;
+    nlink_t st_nlink;
+    uid_t st_uid;
+    gid_t st_gid;
+    dev_t st_rdev;
+    off_t st_size;
+    time_t st_atime;
+    time_t st_mtime;
+    time_t st_ctime;
+    int32_t st_blksize;
+    int32_t st_blocks;
+};
+
+int stat(const char *path, struct stat *st);
+int lstat(const char *path, struct stat *st);
+int fstat(int fd, struct stat *st);
+int mkdir(const char *path, mode_t mode);
+int chmod(const char *path, mode_t mode);
+mode_t umask(mode_t mask);
+
+#endif

foundation/include/pkcl-nolibc/sys/types.h

@@ -0,0 +1,19 @@
+#ifndef PKCL_SYS_TYPES_H
+#define PKCL_SYS_TYPES_H
+#include <stddef.h>
+#include <stdint.h>
+
+/* off_t は 32 bit（2 GiB 未満）。BusyBox は CONFIG_LFS=n で組む。
+ * 大きなオフセットは EOVERFLOW になる（doc/spec_pkcl.md §4）。 */
+typedef int32_t ssize_t;
+typedef int32_t off_t;
+typedef uint32_t mode_t;
+typedef uint32_t uid_t;
+typedef uint32_t gid_t;
+typedef int32_t pid_t;
+typedef uint32_t dev_t;
+typedef uint32_t ino_t;
+typedef uint32_t nlink_t;
+typedef int64_t time_t;
+
+#endif

foundation/include/pkcl-nolibc/unistd.h

@@ -0,0 +1,41 @@
+#ifndef PKCL_UNISTD_H
+#define PKCL_UNISTD_H
+#include <sys/types.h>
+
+#define STDIN_FILENO 0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2
+
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+
+#define F_OK 0
+#define X_OK 1
+#define W_OK 2
+#define R_OK 4
+
+int close(int fd);
+ssize_t read(int fd, void *buf, size_t len);
+ssize_t write(int fd, const void *buf, size_t len);
+off_t lseek(int fd, off_t offset, int whence);
+int dup(int fd);
+int dup2(int fd, int newfd);
+int isatty(int fd);
+int ftruncate(int fd, off_t length);
+int truncate(const char *path, off_t length);
+int fsync(int fd);
+int access(const char *path, int mode);
+int unlink(const char *path);
+int rmdir(const char *path);
+int rename(const char *old_path, const char *new_path);
+int chdir(const char *path);
+char *getcwd(char *buf, size_t size);
+void _exit(int code) __attribute__((noreturn));
+
+uid_t getuid(void);
+uid_t geteuid(void);
+gid_t getgid(void);
+gid_t getegid(void);
+
+#endif

foundation/include/pkcl-posix/arpa/inet.h

@@ -0,0 +1,10 @@
+#ifndef PKCL_ARPA_INET_H
+#define PKCL_ARPA_INET_H
+#include <netinet/in.h>
+
+int inet_aton(const char *text, struct in_addr *addr);
+char *inet_ntoa(struct in_addr addr);
+int inet_pton(int family, const char *text, void *dst);
+const char *inet_ntop(int family, const void *src, char *dst, socklen_t size);
+
+#endif

foundation/include/pkcl-posix/byteswap.h

@@ -0,0 +1,9 @@
+#ifndef PKCL_BYTESWAP_H
+#define PKCL_BYTESWAP_H
+#include <stdint.h>
+
+#define bswap_16(x) ((uint16_t)__builtin_bswap16((uint16_t)(x)))
+#define bswap_32(x) ((uint32_t)__builtin_bswap32((uint32_t)(x)))
+#define bswap_64(x) ((uint64_t)__builtin_bswap64((uint64_t)(x)))
+
+#endif

foundation/include/pkcl-posix/dirent.h

@@ -0,0 +1,32 @@
+#ifndef PKCL_DIRENT_H
+#define PKCL_DIRENT_H
+#include <sys/types.h>
+
+/* Directory streams over fnd_dir_open / fnd_dir_next (doc/spec_pkcl.md §6.2).
+ * Newlib's own <dirent.h> is an #error on a target without one. */
+#define DT_UNKNOWN 0
+#define DT_CHR 2
+#define DT_DIR 4
+#define DT_REG 8
+
+#define NAME_MAX 1024
+#ifndef MAXNAMLEN
+#define MAXNAMLEN NAME_MAX
+#endif
+
+struct dirent {
+    ino_t d_ino;
+    unsigned char d_type;
+    char d_name[NAME_MAX + 1];
+};
+
+typedef struct pkcl_dir DIR;
+
+DIR *opendir(const char *path);
+struct dirent *readdir(DIR *dir);
+int readdir_r(DIR *dir, struct dirent *entry, struct dirent **result);
+void rewinddir(DIR *dir);
+int closedir(DIR *dir);
+int dirfd(DIR *dir);
+
+#endif

foundation/include/pkcl-posix/endian.h

@@ -0,0 +1,12 @@
+#ifndef PKCL_ENDIAN_H
+#define PKCL_ENDIAN_H
+#include <machine/endian.h>
+
+/* Newlib spells these with one underscore; glibc-style code (BusyBox) tests the double one. */
+#ifndef __BYTE_ORDER
+#define __BYTE_ORDER _BYTE_ORDER
+#define __BIG_ENDIAN _BIG_ENDIAN
+#define __LITTLE_ENDIAN _LITTLE_ENDIAN
+#endif
+
+#endif

foundation/include/pkcl-posix/features.h

@@ -0,0 +1 @@
+#include <sys/features.h>

foundation/include/pkcl-posix/glob.h

@@ -0,0 +1,7 @@
+#ifndef PKCL_GLOB_H
+#define PKCL_GLOB_H
+#include_next <glob.h>
+#ifndef GLOB_NOMATCH
+#define GLOB_NOMATCH (-3)
+#endif
+#endif

foundation/include/pkcl-posix/mntent.h

@@ -0,0 +1,19 @@
+#ifndef PKCL_MNTENT_H
+#define PKCL_MNTENT_H
+#include <stdio.h>
+
+/* Foundation has no mount table to read (doc/spec_pkcl.md §6.8). */
+struct mntent {
+    char *mnt_fsname;
+    char *mnt_dir;
+    char *mnt_type;
+    char *mnt_opts;
+    int mnt_freq;
+    int mnt_passno;
+};
+
+FILE *setmntent(const char *file, const char *mode);
+struct mntent *getmntent(FILE *stream);
+int endmntent(FILE *stream);
+
+#endif

foundation/include/pkcl-posix/net/if.h

@@ -0,0 +1,4 @@
+#ifndef PKCL_NET_IF_H
+#define PKCL_NET_IF_H
+#define IF_NAMESIZE 16
+#endif

foundation/include/pkcl-posix/netdb.h

@@ -0,0 +1,50 @@
+#ifndef PKCL_NETDB_H
+#define PKCL_NETDB_H
+#include <sys/socket.h>
+
+/* No resolver (doc/spec_pkcl.md §6.8): declarations only. */
+struct hostent {
+    char *h_name;
+    char **h_aliases;
+    int h_addrtype;
+    int h_length;
+    char **h_addr_list;
+};
+
+struct addrinfo {
+    int ai_flags;
+    int ai_family;
+    int ai_socktype;
+    int ai_protocol;
+    socklen_t ai_addrlen;
+    struct sockaddr *ai_addr;
+    char *ai_canonname;
+    struct addrinfo *ai_next;
+};
+
+#define AI_PASSIVE 1
+#define AI_CANONNAME 2
+#define AI_NUMERICHOST 4
+#define NI_NUMERICHOST 1
+#define NI_NUMERICSERV 2
+#define NI_NAMEREQD 8
+extern int h_errno;
+#define HOST_NOT_FOUND 1
+#define TRY_AGAIN 2
+#define NO_RECOVERY 3
+#define NO_DATA 4
+#define EAI_NONAME (-2)
+#define EAI_FAIL (-4)
+#define EAI_SYSTEM (-11)
+
+struct servent { char *s_name; char **s_aliases; int s_port; char *s_proto; };
+struct servent *getservbyname(const char *name, const char *proto);
+const char *hstrerror(int err);
+struct hostent *gethostbyname(const char *name);
+int getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res);
+void freeaddrinfo(struct addrinfo *res);
+const char *gai_strerror(int code);
+int getnameinfo(const struct sockaddr *addr, socklen_t len, char *host, socklen_t hostlen,
+                char *service, socklen_t servicelen, int flags);
+
+#endif

foundation/include/pkcl-posix/netinet/in.h

@@ -0,0 +1,45 @@
+#ifndef PKCL_NETINET_IN_H
+#define PKCL_NETINET_IN_H
+#include <stdint.h>
+#include <sys/socket.h>
+
+typedef uint16_t in_port_t;
+typedef uint32_t in_addr_t;
+
+struct in_addr {
+    in_addr_t s_addr;
+};
+
+struct in6_addr {
+    uint8_t s6_addr[16];
+};
+
+struct sockaddr_in {
+    sa_family_t sin_family;
+    in_port_t sin_port;
+    struct in_addr sin_addr;
+    unsigned char sin_zero[8];
+};
+
+struct sockaddr_in6 {
+    sa_family_t sin6_family;
+    in_port_t sin6_port;
+    uint32_t sin6_flowinfo;
+    struct in6_addr sin6_addr;
+    uint32_t sin6_scope_id;
+};
+
+#define INADDR_ANY ((in_addr_t)0)
+#define INADDR_LOOPBACK ((in_addr_t)0x7f000001)
+#define IPPROTO_TCP 6
+#define IPPROTO_UDP 17
+#define INET_ADDRSTRLEN 16
+#define INET6_ADDRSTRLEN 46
+
+/* SRC32 is big endian: network order is host order. */
+#define htons(x) ((uint16_t)(x))
+#define ntohs(x) ((uint16_t)(x))
+#define htonl(x) ((uint32_t)(x))
+#define ntohl(x) ((uint32_t)(x))
+
+#endif