include/linux/posix_types.h

   1 #ifndef _LINUX_POSIX_TYPES_H
   2 #define _LINUX_POSIX_TYPES_H
   3
   4 #include <linux/stddef.h>
   5
   6 /*
   7  * This allows for 1024 file descriptors: if NR_OPEN is ever grown
   8  * beyond that you'll have to change this too. But 1024 fd's seem to be
   9  * enough even for such "real" unices like OSF/1, so hopefully this is
  10  * one limit that doesn't have to be changed [again].
  11  *
  12  * Note that POSIX wants the FD_CLEAR(fd,fdsetp) defines to be in
  13  * <sys/time.h> (and thus <linux/time.h>) - but this is a more logical
  14  * place for them. Solved by having dummy defines in <sys/time.h>.
  15  */
  16
  17 /*
  18  * Those macros may have been defined in <gnu/types.h>. But we always
  19  * use the ones here.
  20  */
  21 #undef __NFDBITS
  22 #define __NFDBITS       (8 * sizeof(unsigned long))
  23
  24 #undef __FD_SETSIZE
  25 #define __FD_SETSIZE    1024
  26
  27 #undef __FDSET_LONGS
  28 #define __FDSET_LONGS   (__FD_SETSIZE/__NFDBITS)
  29
  30 #undef __FDELT
  31 #define __FDELT(d)      ((d) / __NFDBITS)
  32
  33 #undef __FDMASK
  34 #define __FDMASK(d)     (1UL << ((d) % __NFDBITS))
  35
  36 typedef struct {
  37         unsigned long fds_bits [__FDSET_LONGS];
  38 } __kernel_fd_set;
  39
  40 /* Type of a signal handler.  */
  41 typedef void (*__kernel_sighandler_t)(int);
  42
  43 /* Type of a SYSV IPC key.  */
  44 typedef int __kernel_key_t;
  45
  46 #include <asm/posix_types.h>
  47
  48 #endif /* _LINUX_POSIX_TYPES_H */