syscalls-common.h 2.4 KB

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  1. /*
  2. * Common syscall type defines
  3. *
  4. * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  5. */
  6. #ifndef _SYSCALLS_COMMON_H
  7. #define _SYSCALLS_COMMON_H 1
  8. #ifndef _SYSCALL_H
  9. # error "Never use <bits/syscalls-common.h> directly; include <sys/syscall.h> instead."
  10. #endif
  11. #ifndef SYS_ify
  12. # define SYS_ify(syscall_name) (__NR_##syscall_name)
  13. #endif
  14. #ifndef __ASSEMBLER__
  15. #include <errno.h>
  16. #ifndef INTERNAL_SYSCALL_DECL
  17. # define INTERNAL_SYSCALL_DECL(err) do { } while (0)
  18. #endif
  19. #ifndef INTERNAL_SYSCALL_ERROR_P
  20. # define INTERNAL_SYSCALL_ERROR_P(val, err) ((unsigned long)val >= (unsigned long)(-4095))
  21. #endif
  22. #ifndef INTERNAL_SYSCALL_ERRNO
  23. # define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
  24. #endif
  25. /* Define a macro which expands into the inline wrapper code for a system call */
  26. #ifndef INLINE_SYSCALL
  27. # define INLINE_SYSCALL(name, nr, args...) \
  28. ({ \
  29. INTERNAL_SYSCALL_DECL(err); \
  30. long res = INTERNAL_SYSCALL(name, err, nr, args); \
  31. if (unlikely(INTERNAL_SYSCALL_ERROR_P(res, err))) { \
  32. __set_errno(INTERNAL_SYSCALL_ERRNO(res, err)); \
  33. res = -1L; \
  34. } \
  35. res; \
  36. })
  37. #endif
  38. #ifndef _syscall0
  39. #define C_DECL_ARGS_0() void
  40. #define C_DECL_ARGS_1(t, v) t v
  41. #define C_DECL_ARGS_2(t, v, args...) t v, C_DECL_ARGS_1(args)
  42. #define C_DECL_ARGS_3(t, v, args...) t v, C_DECL_ARGS_2(args)
  43. #define C_DECL_ARGS_4(t, v, args...) t v, C_DECL_ARGS_3(args)
  44. #define C_DECL_ARGS_5(t, v, args...) t v, C_DECL_ARGS_4(args)
  45. #define C_DECL_ARGS_6(t, v, args...) t v, C_DECL_ARGS_5(args)
  46. #define C_ARGS_0()
  47. #define C_ARGS_1(t, v) v
  48. #define C_ARGS_2(t, v, args...) v, C_ARGS_1(args)
  49. #define C_ARGS_3(t, v, args...) v, C_ARGS_2(args)
  50. #define C_ARGS_4(t, v, args...) v, C_ARGS_3(args)
  51. #define C_ARGS_5(t, v, args...) v, C_ARGS_4(args)
  52. #define C_ARGS_6(t, v, args...) v, C_ARGS_5(args)
  53. #define SYSCALL_FUNC(nargs, type, name, args...) \
  54. type name(C_DECL_ARGS_##nargs(args)) { \
  55. return (type)INLINE_SYSCALL(name, nargs, C_ARGS_##nargs(args)); \
  56. }
  57. #define _syscall0(args...) SYSCALL_FUNC(0, args)
  58. #define _syscall1(args...) SYSCALL_FUNC(1, args)
  59. #define _syscall2(args...) SYSCALL_FUNC(2, args)
  60. #define _syscall3(args...) SYSCALL_FUNC(3, args)
  61. #define _syscall4(args...) SYSCALL_FUNC(4, args)
  62. #define _syscall5(args...) SYSCALL_FUNC(5, args)
  63. #define _syscall6(args...) SYSCALL_FUNC(6, args)
  64. #endif /* _syscall0 */
  65. #endif /* __ASSEMBLER__ */
  66. #endif