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
  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 extern int run_kernel_thread(int (*fn)(void *), void *arg, jmp_buf **jmp_ptr);
 195
 196 extern int os_map_memory(void *virt, int fd, unsigned long long off,
 197                          unsigned long len, int r, int w, int x);
 198 extern int os_protect_memory(void *addr, unsigned long len,
 199                              int r, int w, int x);
 200 extern int os_unmap_memory(void *addr, int len);
 201 extern int os_drop_memory(void *addr, int length);
 202 extern int can_drop_memory(void);
 203 extern void os_flush_stdout(void);
 204
 205 /* execvp.c */
 206 extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
 207 /* helper.c */
 208 extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
 209 extern int run_helper_thread(int (*proc)(void *), void *arg,
 210                              unsigned int flags, unsigned long *stack_out);
 211 extern int helper_wait(int pid);
 212
 213
 214 /* umid.c */
 215 extern int umid_file_name(char *name, char *buf, int len);
 216 extern int set_umid(char *name);
 217 extern char *get_umid(void);
 218
 219 /* signal.c */
 220 extern void timer_init(void);
 221 extern void set_sigstack(void *sig_stack, int size);
 222 extern void remove_sigstack(void);
 223 extern void set_handler(int sig);
 224 extern int change_sig(int signal, int on);
 225 extern void block_signals(void);
 226 extern void unblock_signals(void);
 227 extern int get_signals(void);
 228 extern int set_signals(int enable);
 229
 230 /* util.c */
 231 extern void stack_protections(unsigned long address);
 232 extern int raw(int fd);
 233 extern void setup_machinename(char *machine_out);
 234 extern void setup_hostinfo(char *buf, int len);
 235 extern void os_dump_core(void) __attribute__ ((noreturn));
 236 extern void um_early_printk(const char *s, unsigned int n);
 237
 238 /* time.c */
 239 extern void idle_sleep(unsigned long long nsecs);
 240 extern int set_interval(void);
 241 extern int timer_one_shot(int ticks);
 242 extern long long disable_timer(void);
 243 extern void uml_idle_timer(void);
 244 extern long long os_nsecs(void);
 245
 246 /* skas/mem.c */
 247 extern long run_syscall_stub(struct mm_id * mm_idp,
 248                              int syscall, unsigned long *args, long expected,
 249                              void **addr, int done);
 250 extern long syscall_stub_data(struct mm_id * mm_idp,
 251                               unsigned long *data, int data_count,
 252                               void **addr, void **stub_addr);
 253 extern int map(struct mm_id * mm_idp, unsigned long virt,
 254                unsigned long len, int prot, int phys_fd,
 255                unsigned long long offset, int done, void **data);
 256 extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 257                  int done, void **data);
 258 extern int protect(struct mm_id * mm_idp, unsigned long addr,
 259                    unsigned long len, unsigned int prot, int done, void **data);
 260
 261 /* skas/process.c */
 262 extern int is_skas_winch(int pid, int fd, void *data);
 263 extern int start_userspace(unsigned long stub_stack);
 264 extern int copy_context_skas0(unsigned long stack, int pid);
 265 extern void userspace(struct uml_pt_regs *regs);
 266 extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
 267                           unsigned long stack);
 268 extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
 269 extern void switch_threads(jmp_buf *me, jmp_buf *you);
 270 extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
 271 extern void initial_thread_cb_skas(void (*proc)(void *),
 272                                  void *arg);
 273 extern void halt_skas(void);
 274 extern void reboot_skas(void);
 275
 276 /* irq.c */
 277 extern int os_waiting_for_events(struct irq_fd *active_fds);
 278 extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
 279 extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
 280                 struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
 281 extern void os_free_irq_later(struct irq_fd *active_fds,
 282                 int irq, void *dev_id);
 283 extern int os_get_pollfd(int i);
 284 extern void os_set_pollfd(int i, int fd);
 285 extern void os_set_ioignore(void);
 286
 287 /* sigio.c */
 288 extern int add_sigio_fd(int fd);
 289 extern int ignore_sigio_fd(int fd);
 290 extern void maybe_sigio_broken(int fd, int read);
 291 extern void sigio_broken(int fd, int read);
 292
 293 /* sys-x86_64/prctl.c */
 294 extern int os_arch_prctl(int pid, int code, unsigned long *addr);
 295
 296 /* tty.c */
 297 extern int get_pty(void);
 298
 299 /* sys-$ARCH/task_size.c */
 300 extern unsigned long os_get_top_address(void);
 301
 302 #endif