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-rw-r--r--arch/um/include/shared/os.h303
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diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
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1/*
2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#ifndef __OS_H__
7#define __OS_H__
8
9#include <stdarg.h>
10#include "irq_user.h"
11#include "longjmp.h"
12#include "mm_id.h"
13#include "sysdep/tls.h"
14
15#define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
16
17#define OS_TYPE_FILE 1
18#define OS_TYPE_DIR 2
19#define OS_TYPE_SYMLINK 3
20#define OS_TYPE_CHARDEV 4
21#define OS_TYPE_BLOCKDEV 5
22#define OS_TYPE_FIFO 6
23#define OS_TYPE_SOCK 7
24
25/* os_access() flags */
26#define OS_ACC_F_OK 0 /* Test for existence. */
27#define OS_ACC_X_OK 1 /* Test for execute permission. */
28#define OS_ACC_W_OK 2 /* Test for write permission. */
29#define OS_ACC_R_OK 4 /* Test for read permission. */
30#define OS_ACC_RW_OK (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */
31
32/*
33 * types taken from stat_file() in hostfs_user.c
34 * (if they are wrong here, they are wrong there...).
35 */
36struct uml_stat {
37 int ust_dev; /* device */
38 unsigned long long ust_ino; /* inode */
39 int ust_mode; /* protection */
40 int ust_nlink; /* number of hard links */
41 int ust_uid; /* user ID of owner */
42 int ust_gid; /* group ID of owner */
43 unsigned long long ust_size; /* total size, in bytes */
44 int ust_blksize; /* blocksize for filesystem I/O */
45 unsigned long long ust_blocks; /* number of blocks allocated */
46 unsigned long ust_atime; /* time of last access */
47 unsigned long ust_mtime; /* time of last modification */
48 unsigned long ust_ctime; /* time of last change */
49};
50
51struct openflags {
52 unsigned int r : 1;
53 unsigned int w : 1;
54 unsigned int s : 1; /* O_SYNC */
55 unsigned int c : 1; /* O_CREAT */
56 unsigned int t : 1; /* O_TRUNC */
57 unsigned int a : 1; /* O_APPEND */
58 unsigned int e : 1; /* O_EXCL */
59 unsigned int cl : 1; /* FD_CLOEXEC */
60};
61
62#define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
63 .t = 0, .a = 0, .e = 0, .cl = 0 })
64
65static inline struct openflags of_read(struct openflags flags)
66{
67 flags.r = 1;
68 return flags;
69}
70
71static inline struct openflags of_write(struct openflags flags)
72{
73 flags.w = 1;
74 return flags;
75}
76
77static inline struct openflags of_rdwr(struct openflags flags)
78{
79 return of_read(of_write(flags));
80}
81
82static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
83{
84 flags.r = r;
85 flags.w = w;
86 return flags;
87}
88
89static inline struct openflags of_sync(struct openflags flags)
90{
91 flags.s = 1;
92 return flags;
93}
94
95static inline struct openflags of_create(struct openflags flags)
96{
97 flags.c = 1;
98 return flags;
99}
100
101static inline struct openflags of_trunc(struct openflags flags)
102{
103 flags.t = 1;
104 return flags;
105}
106
107static inline struct openflags of_append(struct openflags flags)
108{
109 flags.a = 1;
110 return flags;
111}
112
113static inline struct openflags of_excl(struct openflags flags)
114{
115 flags.e = 1;
116 return flags;
117}
118
119static inline struct openflags of_cloexec(struct openflags flags)
120{
121 flags.cl = 1;
122 return flags;
123}
124
125/* file.c */
126extern int os_stat_file(const char *file_name, struct uml_stat *buf);
127extern int os_stat_fd(const int fd, struct uml_stat *buf);
128extern int os_access(const char *file, int mode);
129extern int os_set_exec_close(int fd);
130extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
131extern int os_get_ifname(int fd, char *namebuf);
132extern int os_set_slip(int fd);
133extern int os_mode_fd(int fd, int mode);
134
135extern int os_seek_file(int fd, unsigned long long offset);
136extern int os_open_file(const char *file, struct openflags flags, int mode);
137extern int os_read_file(int fd, void *buf, int len);
138extern int os_write_file(int fd, const void *buf, int count);
139extern int os_file_size(const char *file, unsigned long long *size_out);
140extern int os_file_modtime(const char *file, unsigned long *modtime);
141extern int os_pipe(int *fd, int stream, int close_on_exec);
142extern int os_set_fd_async(int fd);
143extern int os_clear_fd_async(int fd);
144extern int os_set_fd_block(int fd, int blocking);
145extern int os_accept_connection(int fd);
146extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
147extern int os_shutdown_socket(int fd, int r, int w);
148extern void os_close_file(int fd);
149extern int os_rcv_fd(int fd, int *helper_pid_out);
150extern int create_unix_socket(char *file, int len, int close_on_exec);
151extern int os_connect_socket(const char *name);
152extern int os_file_type(char *file);
153extern int os_file_mode(const char *file, struct openflags *mode_out);
154extern int os_lock_file(int fd, int excl);
155extern void os_flush_stdout(void);
156extern int os_stat_filesystem(char *path, long *bsize_out,
157 long long *blocks_out, long long *bfree_out,
158 long long *bavail_out, long long *files_out,
159 long long *ffree_out, void *fsid_out,
160 int fsid_size, long *namelen_out,
161 long *spare_out);
162extern int os_change_dir(char *dir);
163extern int os_fchange_dir(int fd);
164
165/* start_up.c */
166extern void os_early_checks(void);
167extern void can_do_skas(void);
168extern void os_check_bugs(void);
169extern void check_host_supports_tls(int *supports_tls, int *tls_min);
170
171/* mem.c */
172extern int create_mem_file(unsigned long long len);
173
174/* process.c */
175extern unsigned long os_process_pc(int pid);
176extern int os_process_parent(int pid);
177extern void os_stop_process(int pid);
178extern void os_kill_process(int pid, int reap_child);
179extern void os_kill_ptraced_process(int pid, int reap_child);
180extern long os_ptrace_ldt(long pid, long addr, long data);
181
182extern int os_getpid(void);
183extern int os_getpgrp(void);
184
185extern void init_new_thread_signals(void);
186extern int run_kernel_thread(int (*fn)(void *), void *arg, jmp_buf **jmp_ptr);
187
188extern int os_map_memory(void *virt, int fd, unsigned long long off,
189 unsigned long len, int r, int w, int x);
190extern int os_protect_memory(void *addr, unsigned long len,
191 int r, int w, int x);
192extern int os_unmap_memory(void *addr, int len);
193extern int os_drop_memory(void *addr, int length);
194extern int can_drop_memory(void);
195extern void os_flush_stdout(void);
196
197/* uaccess.c */
198extern unsigned long __do_user_copy(void *to, const void *from, int n,
199 void **fault_addr, jmp_buf **fault_catcher,
200 void (*op)(void *to, const void *from,
201 int n), int *faulted_out);
202
203/* execvp.c */
204extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
205/* helper.c */
206extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
207extern int run_helper_thread(int (*proc)(void *), void *arg,
208 unsigned int flags, unsigned long *stack_out);
209extern int helper_wait(int pid);
210
211
212/* tls.c */
213extern int os_set_thread_area(user_desc_t *info, int pid);
214extern int os_get_thread_area(user_desc_t *info, int pid);
215
216/* umid.c */
217extern int umid_file_name(char *name, char *buf, int len);
218extern int set_umid(char *name);
219extern char *get_umid(void);
220
221/* signal.c */
222extern void timer_init(void);
223extern void set_sigstack(void *sig_stack, int size);
224extern void remove_sigstack(void);
225extern void set_handler(int sig, void (*handler)(int), int flags, ...);
226extern int change_sig(int signal, int on);
227extern void block_signals(void);
228extern void unblock_signals(void);
229extern int get_signals(void);
230extern int set_signals(int enable);
231
232/* util.c */
233extern void stack_protections(unsigned long address);
234extern int raw(int fd);
235extern void setup_machinename(char *machine_out);
236extern void setup_hostinfo(char *buf, int len);
237extern void os_dump_core(void) __attribute__ ((noreturn));
238
239/* time.c */
240extern void idle_sleep(unsigned long long nsecs);
241extern int set_interval(void);
242extern int timer_one_shot(int ticks);
243extern long long disable_timer(void);
244extern void uml_idle_timer(void);
245extern long long os_nsecs(void);
246
247/* skas/mem.c */
248extern long run_syscall_stub(struct mm_id * mm_idp,
249 int syscall, unsigned long *args, long expected,
250 void **addr, int done);
251extern long syscall_stub_data(struct mm_id * mm_idp,
252 unsigned long *data, int data_count,
253 void **addr, void **stub_addr);
254extern int map(struct mm_id * mm_idp, unsigned long virt,
255 unsigned long len, int prot, int phys_fd,
256 unsigned long long offset, int done, void **data);
257extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
258 int done, void **data);
259extern int protect(struct mm_id * mm_idp, unsigned long addr,
260 unsigned long len, unsigned int prot, int done, void **data);
261
262/* skas/process.c */
263extern int is_skas_winch(int pid, int fd, void *data);
264extern int start_userspace(unsigned long stub_stack);
265extern int copy_context_skas0(unsigned long stack, int pid);
266extern void userspace(struct uml_pt_regs *regs);
267extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
268 unsigned long stack);
269extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
270extern void switch_threads(jmp_buf *me, jmp_buf *you);
271extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
272extern void initial_thread_cb_skas(void (*proc)(void *),
273 void *arg);
274extern void halt_skas(void);
275extern void reboot_skas(void);
276
277/* irq.c */
278extern int os_waiting_for_events(struct irq_fd *active_fds);
279extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
280extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
281 struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
282extern void os_free_irq_later(struct irq_fd *active_fds,
283 int irq, void *dev_id);
284extern int os_get_pollfd(int i);
285extern void os_set_pollfd(int i, int fd);
286extern void os_set_ioignore(void);
287
288/* sigio.c */
289extern int add_sigio_fd(int fd);
290extern int ignore_sigio_fd(int fd);
291extern void maybe_sigio_broken(int fd, int read);
292extern void sigio_broken(int fd, int read);
293
294/* sys-x86_64/prctl.c */
295extern int os_arch_prctl(int pid, int code, unsigned long *addr);
296
297/* tty.c */
298extern int get_pty(void);
299
300/* sys-$ARCH/task_size.c */
301extern unsigned long os_get_top_address(void);
302
303#endif
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