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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 
14 #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
15 
16 #define OS_TYPE_FILE 1
17 #define OS_TYPE_DIR 2
18 #define OS_TYPE_SYMLINK 3
19 #define OS_TYPE_CHARDEV 4
20 #define OS_TYPE_BLOCKDEV 5
21 #define OS_TYPE_FIFO 6
22 #define OS_TYPE_SOCK 7
23 
24 /* os_access() flags */
25 #define OS_ACC_F_OK 0 /* Test for existence. */
26 #define OS_ACC_X_OK 1 /* Test for execute permission. */
27 #define OS_ACC_W_OK 2 /* Test for write permission. */
28 #define OS_ACC_R_OK 4 /* Test for read permission. */
29 #define OS_ACC_RW_OK (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */
30 
31 #ifdef CONFIG_64BIT
32 #define OS_LIB_PATH "/usr/lib64/"
33 #else
34 #define OS_LIB_PATH "/usr/lib/"
35 #endif
36 
37 /*
38  * types taken from stat_file() in hostfs_user.c
39  * (if they are wrong here, they are wrong there...).
40  */
41 struct uml_stat {
42  int ust_dev; /* device */
43  unsigned long long ust_ino; /* inode */
44  int ust_mode; /* protection */
45  int ust_nlink; /* number of hard links */
46  int ust_uid; /* user ID of owner */
47  int ust_gid; /* group ID of owner */
48  unsigned long long ust_size; /* total size, in bytes */
49  int ust_blksize; /* blocksize for filesystem I/O */
50  unsigned long long ust_blocks; /* number of blocks allocated */
51  unsigned long ust_atime; /* time of last access */
52  unsigned long ust_mtime; /* time of last modification */
53  unsigned long ust_ctime; /* time of last change */
54 };
55 
56 struct openflags {
57  unsigned int r : 1;
58  unsigned int w : 1;
59  unsigned int s : 1; /* O_SYNC */
60  unsigned int c : 1; /* O_CREAT */
61  unsigned int t : 1; /* O_TRUNC */
62  unsigned int a : 1; /* O_APPEND */
63  unsigned int e : 1; /* O_EXCL */
64  unsigned int cl : 1; /* FD_CLOEXEC */
65 };
66 
67 #define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
68  .t = 0, .a = 0, .e = 0, .cl = 0 })
69 
70 static inline struct openflags of_read(struct openflags flags)
71 {
72  flags.r = 1;
73  return flags;
74 }
75 
76 static inline struct openflags of_write(struct openflags flags)
77 {
78  flags.w = 1;
79  return flags;
80 }
81 
82 static inline struct openflags of_rdwr(struct openflags flags)
83 {
84  return of_read(of_write(flags));
85 }
86 
87 static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
88 {
89  flags.r = r;
90  flags.w = w;
91  return flags;
92 }
93 
94 static inline struct openflags of_sync(struct openflags flags)
95 {
96  flags.s = 1;
97  return flags;
98 }
99 
100 static inline struct openflags of_create(struct openflags flags)
101 {
102  flags.c = 1;
103  return flags;
104 }
105 
106 static inline struct openflags of_trunc(struct openflags flags)
107 {
108  flags.t = 1;
109  return flags;
110 }
111 
112 static inline struct openflags of_append(struct openflags flags)
113 {
114  flags.a = 1;
115  return flags;
116 }
117 
118 static inline struct openflags of_excl(struct openflags flags)
119 {
120  flags.e = 1;
121  return flags;
122 }
123 
124 static inline struct openflags of_cloexec(struct openflags flags)
125 {
126  flags.cl = 1;
127  return flags;
128 }
129 
130 /* file.c */
131 extern int os_stat_file(const char *file_name, struct uml_stat *buf);
132 extern int os_stat_fd(const int fd, struct uml_stat *buf);
133 extern int os_access(const char *file, int mode);
134 extern int os_set_exec_close(int fd);
135 extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
136 extern int os_get_ifname(int fd, char *namebuf);
137 extern int os_set_slip(int fd);
138 extern int os_mode_fd(int fd, int mode);
139 
140 extern int os_seek_file(int fd, unsigned long long offset);
141 extern int os_open_file(const char *file, struct openflags flags, int mode);
142 extern int os_read_file(int fd, void *buf, int len);
143 extern int os_write_file(int fd, const void *buf, int count);
144 extern int os_file_size(const char *file, unsigned long long *size_out);
145 extern int os_file_modtime(const char *file, unsigned long *modtime);
146 extern int os_pipe(int *fd, int stream, int close_on_exec);
147 extern int os_set_fd_async(int fd);
148 extern int os_clear_fd_async(int fd);
149 extern int os_set_fd_block(int fd, int blocking);
150 extern int os_accept_connection(int fd);
151 extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
152 extern int os_shutdown_socket(int fd, int r, int w);
153 extern void os_close_file(int fd);
154 extern int os_rcv_fd(int fd, int *helper_pid_out);
155 extern int create_unix_socket(char *file, int len, int close_on_exec);
156 extern int os_connect_socket(const char *name);
157 extern int os_file_type(char *file);
158 extern int os_file_mode(const char *file, struct openflags *mode_out);
159 extern int os_lock_file(int fd, int excl);
160 extern void os_flush_stdout(void);
161 extern int os_stat_filesystem(char *path, long *bsize_out,
162  long long *blocks_out, long long *bfree_out,
163  long long *bavail_out, long long *files_out,
164  long long *ffree_out, void *fsid_out,
165  int fsid_size, long *namelen_out,
166  long *spare_out);
167 extern int os_change_dir(char *dir);
168 extern int os_fchange_dir(int fd);
169 extern unsigned os_major(unsigned long long dev);
170 extern unsigned os_minor(unsigned long long dev);
171 extern unsigned long long os_makedev(unsigned major, unsigned minor);
172 
173 /* start_up.c */
174 extern void os_early_checks(void);
175 extern void can_do_skas(void);
176 extern void os_check_bugs(void);
177 extern void check_host_supports_tls(int *supports_tls, int *tls_min);
178 
179 /* mem.c */
180 extern int create_mem_file(unsigned long long len);
181 
182 /* process.c */
183 extern unsigned long os_process_pc(int pid);
184 extern int os_process_parent(int pid);
185 extern void os_stop_process(int pid);
186 extern void os_kill_process(int pid, int reap_child);
187 extern void os_kill_ptraced_process(int pid, int reap_child);
188 extern long os_ptrace_ldt(long pid, long addr, long data);
189 
190 extern int os_getpid(void);
191 extern int os_getpgrp(void);
192 
193 extern void init_new_thread_signals(void);
194 
195 extern int os_map_memory(void *virt, int fd, unsigned long long off,
196  unsigned long len, int r, int w, int x);
197 extern int os_protect_memory(void *addr, unsigned long len,
198  int r, int w, int x);
199 extern int os_unmap_memory(void *addr, int len);
200 extern int os_drop_memory(void *addr, int length);
201 extern int can_drop_memory(void);
202 extern void os_flush_stdout(void);
203 
204 /* execvp.c */
205 extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
206 /* helper.c */
207 extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
208 extern int run_helper_thread(int (*proc)(void *), void *arg,
209  unsigned int flags, unsigned long *stack_out);
210 extern int helper_wait(int pid);
211 
212 
213 /* umid.c */
214 extern int umid_file_name(char *name, char *buf, int len);
215 extern int set_umid(char *name);
216 extern char *get_umid(void);
217 
218 /* signal.c */
219 extern void timer_init(void);
220 extern void set_sigstack(void *sig_stack, int size);
221 extern void remove_sigstack(void);
222 extern void set_handler(int sig);
223 extern int change_sig(int signal, int on);
224 extern void block_signals(void);
225 extern void unblock_signals(void);
226 extern int get_signals(void);
227 extern int set_signals(int enable);
228 
229 /* util.c */
230 extern void stack_protections(unsigned long address);
231 extern int raw(int fd);
232 extern void setup_machinename(char *machine_out);
233 extern void setup_hostinfo(char *buf, int len);
234 extern void os_dump_core(void) __attribute__ ((noreturn));
235 extern void um_early_printk(const char *s, unsigned int n);
236 
237 /* time.c */
238 extern void idle_sleep(unsigned long long nsecs);
239 extern int set_interval(void);
240 extern int timer_one_shot(int ticks);
241 extern long long disable_timer(void);
242 extern void uml_idle_timer(void);
243 extern long long os_nsecs(void);
244 
245 /* skas/mem.c */
246 extern long run_syscall_stub(struct mm_id * mm_idp,
247  int syscall, unsigned long *args, long expected,
248  void **addr, int done);
249 extern long syscall_stub_data(struct mm_id * mm_idp,
250  unsigned long *data, int data_count,
251  void **addr, void **stub_addr);
252 extern int map(struct mm_id * mm_idp, unsigned long virt,
253  unsigned long len, int prot, int phys_fd,
254  unsigned long long offset, int done, void **data);
255 extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
256  int done, void **data);
257 extern int protect(struct mm_id * mm_idp, unsigned long addr,
258  unsigned long len, unsigned int prot, int done, void **data);
259 
260 /* skas/process.c */
261 extern int is_skas_winch(int pid, int fd, void *data);
262 extern int start_userspace(unsigned long stub_stack);
263 extern int copy_context_skas0(unsigned long stack, int pid);
264 extern void userspace(struct uml_pt_regs *regs);
265 extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
266  unsigned long stack);
267 extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
268 extern void switch_threads(jmp_buf *me, jmp_buf *you);
269 extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
270 extern void initial_thread_cb_skas(void (*proc)(void *),
271  void *arg);
272 extern void halt_skas(void);
273 extern void reboot_skas(void);
274 
275 /* irq.c */
276 extern int os_waiting_for_events(struct irq_fd *active_fds);
277 extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
278 extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
279  struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
280 extern void os_free_irq_later(struct irq_fd *active_fds,
281  int irq, void *dev_id);
282 extern int os_get_pollfd(int i);
283 extern void os_set_pollfd(int i, int fd);
284 extern void os_set_ioignore(void);
285 
286 /* sigio.c */
287 extern int add_sigio_fd(int fd);
288 extern int ignore_sigio_fd(int fd);
289 extern void maybe_sigio_broken(int fd, int read);
290 extern void sigio_broken(int fd, int read);
291 
292 /* sys-x86_64/prctl.c */
293 extern int os_arch_prctl(int pid, int code, unsigned long *addr);
294 
295 /* tty.c */
296 extern int get_pty(void);
297 
298 /* sys-$ARCH/task_size.c */
299 extern unsigned long os_get_top_address(void);
300 
301 #endif