arch/um/include/shared/os.h

   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 #ifdef CONFIG_64BIT
  33 #define OS_LIB_PATH     "/usr/lib64/"
  34 #else
  35 #define OS_LIB_PATH     "/usr/lib/"
  36 #endif
  37
  38 /*
  39  * types taken from stat_file() in hostfs_user.c
  40  * (if they are wrong here, they are wrong there...).
  41  */
  42 struct uml_stat {
  43         int                ust_dev;        /* device */
  44         unsigned long long ust_ino;        /* inode */
  45         int                ust_mode;       /* protection */
  46         int                ust_nlink;      /* number of hard links */
  47         int                ust_uid;        /* user ID of owner */
  48         int                ust_gid;        /* group ID of owner */
  49         unsigned long long ust_size;       /* total size, in bytes */
  50         int                ust_blksize;    /* blocksize for filesystem I/O */
  51         unsigned long long ust_blocks;     /* number of blocks allocated */
  52         unsigned long      ust_atime;      /* time of last access */
  53         unsigned long      ust_mtime;      /* time of last modification */
  54         unsigned long      ust_ctime;      /* time of last change */
  55 };
  56
  57 struct openflags {
  58         unsigned int r : 1;
  59         unsigned int w : 1;
  60         unsigned int s : 1;     /* O_SYNC */
  61         unsigned int c : 1;     /* O_CREAT */
  62         unsigned int t : 1;     /* O_TRUNC */
  63         unsigned int a : 1;     /* O_APPEND */
  64         unsigned int e : 1;     /* O_EXCL */
  65         unsigned int cl : 1;    /* FD_CLOEXEC */
  66 };
  67
  68 #define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
  69                                           .t = 0, .a = 0, .e = 0, .cl = 0 })
  70
  71 static inline struct openflags of_read(struct openflags flags)
  72 {
  73         flags.r = 1;
  74         return flags;
  75 }
  76
  77 static inline struct openflags of_write(struct openflags flags)
  78 {
  79         flags.w = 1;
  80         return flags;
  81 }
  82
  83 static inline struct openflags of_rdwr(struct openflags flags)
  84 {
  85         return of_read(of_write(flags));
  86 }
  87
  88 static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
  89 {
  90         flags.r = r;
  91         flags.w = w;
  92         return flags;
  93 }
  94
  95 static inline struct openflags of_sync(struct openflags flags)
  96 {
  97         flags.s = 1;
  98         return flags;
  99 }
 100
 101 static inline struct openflags of_create(struct openflags flags)
 102 {
 103         flags.c = 1;
 104         return flags;
 105 }
 106
 107 static inline struct openflags of_trunc(struct openflags flags)
 108 {
 109         flags.t = 1;
 110         return flags;
 111 }
 112
 113 static inline struct openflags of_append(struct openflags flags)
 114 {
 115         flags.a = 1;
 116         return flags;
 117 }
 118
 119 static inline struct openflags of_excl(struct openflags flags)
 120 {
 121         flags.e = 1;
 122         return flags;
 123 }
 124
 125 static inline struct openflags of_cloexec(struct openflags flags)
 126 {
 127         flags.cl = 1;
 128         return flags;
 129 }
 130
 131 /* file.c */
 132 extern int os_stat_file(const char *file_name, struct uml_stat *buf);
 133 extern int os_stat_fd(const int fd, struct uml_stat *buf);
 134 extern int os_access(const char *file, int mode);
 135 extern int os_set_exec_close(int fd);
 136 extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
 137 extern int os_get_ifname(int fd, char *namebuf);
 138 extern int os_set_slip(int fd);
 139 extern int os_mode_fd(int fd, int mode);
 140
 141 extern int os_seek_file(int fd, unsigned long long offset);
 142 extern int os_open_file(const char *file, struct openflags flags, int mode);
 143 extern int os_read_file(int fd, void *buf, int len);
 144 extern int os_write_file(int fd, const void *buf, int count);
 145 extern int os_file_size(const char *file, unsigned long long *size_out);
 146 extern int os_file_modtime(const char *file, unsigned long *modtime);
 147 extern int os_pipe(int *fd, int stream, int close_on_exec);
 148 extern int os_set_fd_async(int fd);
 149 extern int os_clear_fd_async(int fd);
 150 extern int os_set_fd_block(int fd, int blocking);
 151 extern int os_accept_connection(int fd);
 152 extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
 153 extern int os_shutdown_socket(int fd, int r, int w);
 154 extern void os_close_file(int fd);
 155 extern int os_rcv_fd(int fd, int *helper_pid_out);
 156 extern int create_unix_socket(char *file, int len, int close_on_exec);
 157 extern int os_connect_socket(const char *name);
 158 extern int os_file_type(char *file);
 159 extern int os_file_mode(const char *file, struct openflags *mode_out);
 160 extern int os_lock_file(int fd, int excl);
 161 extern void os_flush_stdout(void);
 162 extern int os_stat_filesystem(char *path, long *bsize_out,
 163                               long long *blocks_out, long long *bfree_out,
 164                               long long *bavail_out, long long *files_out,
 165                               long long *ffree_out, void *fsid_out,
 166                               int fsid_size, long *namelen_out,
 167                               long *spare_out);
 168 extern int os_change_dir(char *dir);
 169 extern int os_fchange_dir(int fd);
 170 extern unsigned os_major(unsigned long long dev);
 171 extern unsigned os_minor(unsigned long long dev);
 172 extern unsigned long long os_makedev(unsigned major, unsigned minor);
 173
 174 /* start_up.c */
 175 extern void os_early_checks(void);
 176 extern void can_do_skas(void);
 177 extern void os_check_bugs(void);
 178 extern void check_host_supports_tls(int *supports_tls, int *tls_min);
 179
 180 /* mem.c */
 181 extern int create_mem_file(unsigned long long len);
 182
 183 /* process.c */
 184 extern unsigned long os_process_pc(int pid);
 185 extern int os_process_parent(int pid);
 186 extern void os_stop_process(int pid);
 187 extern void os_kill_process(int pid, int reap_child);
 188 extern void os_kill_ptraced_process(int pid, int reap_child);
 189 extern long os_ptrace_ldt(long pid, long addr, long data);
 190
 191 extern int os_getpid(void);
 192 extern int os_getpgrp(void);
 193
 194 extern void init_new_thread_signals(void);
 195 extern int run_kernel_thread(int (*fn)(void *), void *arg, jmp_buf **jmp_ptr);
 196
 197 extern int os_map_memory(void *virt, int fd, unsigned long long off,
 198                          unsigned long len, int r, int w, int x);
 199 extern int os_protect_memory(void *addr, unsigned long len,
 200                              int r, int w, int x);
 201 extern int os_unmap_memory(void *addr, int len);
 202 extern int os_drop_memory(void *addr, int length);
 203 extern int can_drop_memory(void);
 204 extern void os_flush_stdout(void);
 205
 206 /* execvp.c */
 207 extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
 208 /* helper.c */
 209 extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
 210 extern int run_helper_thread(int (*proc)(void *), void *arg,
 211                              unsigned int flags, unsigned long *stack_out);
 212 extern int helper_wait(int pid);
 213
 214
 215 /* tls.c */
 216 extern int os_set_thread_area(user_desc_t *info, int pid);
 217 extern int os_get_thread_area(user_desc_t *info, int pid);
 218
 219 /* umid.c */
 220 extern int umid_file_name(char *name, char *buf, int len);
 221 extern int set_umid(char *name);
 222 extern char *get_umid(void);
 223
 224 /* signal.c */
 225 extern void timer_init(void);
 226 extern void set_sigstack(void *sig_stack, int size);
 227 extern void remove_sigstack(void);
 228 extern void set_handler(int sig);
 229 extern int change_sig(int signal, int on);
 230 extern void block_signals(void);
 231 extern void unblock_signals(void);
 232 extern int get_signals(void);
 233 extern int set_signals(int enable);
 234
 235 /* util.c */
 236 extern void stack_protections(unsigned long address);
 237 extern int raw(int fd);
 238 extern void setup_machinename(char *machine_out);
 239 extern void setup_hostinfo(char *buf, int len);
 240 extern void os_dump_core(void) __attribute__ ((noreturn));
 241 extern void um_early_printk(const char *s, unsigned int n);
 242
 243 /* time.c */
 244 extern void idle_sleep(unsigned long long nsecs);
 245 extern int set_interval(void);
 246 extern int timer_one_shot(int ticks);
 247 extern long long disable_timer(void);
 248 extern void uml_idle_timer(void);
 249 extern long long os_nsecs(void);
 250
 251 /* skas/mem.c */
 252 extern long run_syscall_stub(struct mm_id * mm_idp,
 253                              int syscall, unsigned long *args, long expected,
 254                              void **addr, int done);
 255 extern long syscall_stub_data(struct mm_id * mm_idp,
 256                               unsigned long *data, int data_count,
 257                               void **addr, void **stub_addr);
 258 extern int map(struct mm_id * mm_idp, unsigned long virt,
 259                unsigned long len, int prot, int phys_fd,
 260                unsigned long long offset, int done, void **data);
 261 extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 262                  int done, void **data);
 263 extern int protect(struct mm_id * mm_idp, unsigned long addr,
 264                    unsigned long len, unsigned int prot, int done, void **data);
 265
 266 /* skas/process.c */
 267 extern int is_skas_winch(int pid, int fd, void *data);
 268 extern int start_userspace(unsigned long stub_stack);
 269 extern int copy_context_skas0(unsigned long stack, int pid);
 270 extern void userspace(struct uml_pt_regs *regs);
 271 extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
 272                           unsigned long stack);
 273 extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
 274 extern void switch_threads(jmp_buf *me, jmp_buf *you);
 275 extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
 276 extern void initial_thread_cb_skas(void (*proc)(void *),
 277                                  void *arg);
 278 extern void halt_skas(void);
 279 extern void reboot_skas(void);
 280
 281 /* irq.c */
 282 extern int os_waiting_for_events(struct irq_fd *active_fds);
 283 extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
 284 extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
 285                 struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
 286 extern void os_free_irq_later(struct irq_fd *active_fds,
 287                 int irq, void *dev_id);
 288 extern int os_get_pollfd(int i);
 289 extern void os_set_pollfd(int i, int fd);
 290 extern void os_set_ioignore(void);
 291
 292 /* sigio.c */
 293 extern int add_sigio_fd(int fd);
 294 extern int ignore_sigio_fd(int fd);
 295 extern void maybe_sigio_broken(int fd, int read);
 296 extern void sigio_broken(int fd, int read);
 297
 298 /* sys-x86_64/prctl.c */
 299 extern int os_arch_prctl(int pid, int code, unsigned long *addr);
 300
 301 /* tty.c */
 302 extern int get_pty(void);
 303
 304 /* sys-$ARCH/task_size.c */
 305 extern unsigned long os_get_top_address(void);
 306
 307 #endif