#pragma once
#ifndef USER_H
#define USER_H

#include "types.h"
#include "date.h"

struct stat;
struct rtcdate;
struct mouse_data;

// --- system calls ---
int fork(void);
void exit(void) __attribute__((noreturn));
int wait(void);
int pipe(int*);
int write(int, void*, int);
int read(int, void*, int);
int close(int);
int kill(int);
int exec(char*, char**);            /* execve(path, argv, 0) */
int execve(char*, char**, char**);
int open(char*, int);
int mknod(char*, short, short);
int unlink(char*);
int fstat(int fd, struct stat*);
int link(char*, char*);
int mkdir(char*);
int chdir(char*);
int dup(int);
int dup2(int, int);
int fcntl(int, int, int);
long lseek(int, long, int);
int getpid(void);
char* sbrk(uint64);
int sleep(int);
int uptime(void);
int vga_sync(void*);  // legacy no-op syscall; the name is ABI, not this layer
int getmouse(struct mouse_data*);
int reboot(void);
int shutdown(void);
int sigfillset(sigset_t *set);
int sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
int sigwait(const sigset_t *set, int *sig);
int alarm(int seconds);
int waitpid(int pid, int *status, int options);
int setsid(void);
void* mmap(void*, uint64, int, int, int, uint64);
// Shared memory. shmat returns the attach address, or a small negative value
// on failure — there is no errno in this runtime, so check for < 0.
int   shmget(int key, uint64 size, int flags);
void* shmat(int id, void *addr, int flags);
int   shmdt(void *addr);
int munmap(void*, uint64);
int delete(char*);
int show(char*);
int showstat(char*, struct stat*);
int ftruncate(int, int);
int truncate(char*, int);
int rename(const char*, const char*);
int symlink(char*, char*);
int readlink(char*, char*, int);
int getuid(void);
int geteuid(void);
int nanosleep(void*);
int mprotect(void*, uint64, int);
int ioctl(int, uint64, void*);
// Declared at file scope, not inside the prototype: struct pollfd lives in
// posix.h, and a tag first seen in a parameter list is scoped to that list --
// so the prototype would describe a different, incompatible type.
struct pollfd;
int poll(struct pollfd*, int, int);

// Attributes on a file, and the index over them. Only SchFS carries these;
// anything else answers EOPNOTSUPP.
//
// schfs_query returns how many object ids it wrote, or -1 if the attribute has
// no index -- it will not fall back to walking the filesystem, because a query
// that silently becomes a full scan is worse than one that says it cannot help.
int setxattr(const char *path, const char *name, const void *val, int size,
             int flags);
int getxattr(const char *path, const char *name, void *val, int size);
int removexattr(const char *path, const char *name);
int schfs_index(const char *name);
int schfs_query(const char *name, const char *value,
                unsigned long long *out, int cap);
char* getcwd(char*, int);
int arch_prctl(int, uint64);
int set_tid_address(int*);
int set_robust_list(void*, int);
int futex(int*, int, int, void*, int*, int);
int clone(uint64, void*, void*, void*, void*);
void exit_group(int) __attribute__((noreturn));
int wait4(int, int*, int, void*);
int getgid(void);
int getegid(void);
int umask(int);
int writev(int, void*, int);
int readv(int, void*, int);
void* brk(void*);
int prlimit(int, int, void*, void*);
int lstat(const char*, struct stat*);
int access(const char*, int);
int openat(int, const char*, int, ...);
int fchdir(int);
int enable_linux_abi(void);
int getrlimit(int, void*);
int setuid(int);
int setgid(int);
int getsid(int);
int dup3(int, int, int);
int pipe2(int*, int);
int clock_gettime(int, void*);
int getppid(void);
int rt_sigaction(int, void*, void*, uint64);
int mount(const char *src, const char *tgt, const char *fstype, uint64 flags, void *data);

// Directory reading. The kernel has had getdents64 since the Linux ABI landed,
// but nothing declared it here, so first-party programs had no way to list a
// directory at all -- which is what schinit needs to find its job files.
//
// Records are packed: step by d_reclen, never by sizeof, because d_name is a
// flexible array and each record is only as long as its name needs.
struct dirent64 {
    uint64 d_ino;
    int64  d_off;
    ushort d_reclen;
    uchar  d_type;
    char   d_name[];
};
#define DT_DIR 4
#define DT_REG 8

int getdents64(int fd, void *buf, int count);

// Sockets. `struct sockaddr` and the AF_*/SOCK_* constants are in socket.h;
// include it as well as this header to use them.
struct sockaddr;
int socket(int domain, int type, int protocol);
int bind(int fd, const struct sockaddr *addr, int addrlen);
int listen(int fd, int backlog);
int accept(int fd, struct sockaddr *addr, int *addrlen);
int accept4(int fd, struct sockaddr *addr, int *addrlen, int flags);
int connect(int fd, const struct sockaddr *addr, int addrlen);
int socketpair(int domain, int type, int protocol, int sv[2]);
int sendto(int fd, const void *buf, int len, int flags, const struct sockaddr*, int);
int recvfrom(int fd, void *buf, int len, int flags, struct sockaddr*, int*);
int sockshutdown(int fd, int how);
int setsockopt(int fd, int level, int opt, const void *val, int len);
int getsockopt(int fd, int level, int opt, void *val, int *len);

// --- ulib.c ---
int stat(const char*, struct stat*);
char* gets(char*, int max);

#endif // USER_H