diff options
Diffstat (limited to 'misc')
| -rw-r--r-- | misc/sys/select.h | 72 |
1 files changed, 46 insertions, 26 deletions
diff --git a/misc/sys/select.h b/misc/sys/select.h index c182cb93c5..331636106f 100644 --- a/misc/sys/select.h +++ b/misc/sys/select.h @@ -1,5 +1,5 @@ /* `fd_set' type and related macros, and `select'/`pselect' declarations. - Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc. + Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -33,58 +33,78 @@ /* Get __sigset_t. */ #include <bits/sigset.h> +#ifndef __sigset_t_defined +# define __sigset_t_defined +typedef __sigset_t sigset_t; +#endif + /* Get definition of timer specification structures. */ #define __need_timespec #include <time.h> - -__BEGIN_DECLS - -/* This declaration puts `struct timeval' in global scope even if - <sys/time.h> has not been included to define it. That way the - `select' prototype below will not conflict with a later definition - of `struct timeval'. */ -struct timeval; - -typedef __fd_mask fd_mask; - -/* Representation of a set of file descriptors. */ -typedef __fd_set fd_set; +#define __need_timeval +#include <sys/time.h> + + +/* The fd_set member is required to be an array of longs. */ +typedef long int __fd_mask; + +/* It's easier to assume 8-bit bytes than to get CHAR_BIT. */ +#define __NFDBITS (8 * sizeof (__fd_mask)) +#define __FDELT(d) ((d) / __NFDBITS) +#define __FDMASK(d) ((__fd_mask) 1 << ((d) % __NFDBITS)) + +/* fd_set for select and pselect. */ +typedef struct + { + /* XPG4.2 requires this member name. Otherwise avoid the name + from the global namespace. */ +#ifdef __USE_XOPEN + __fd_mask fds_bits[__FD_SETSIZE / __NFDBITS]; +# define __FDS_BITS(set) ((set)->fds_bits) +#else + __fd_mask __fds_bits[__FD_SETSIZE / __NFDBITS]; +# define __FDS_BITS(set) ((set)->__fds_bits) +#endif + } fd_set; /* Maximum number of file descriptors in `fd_set'. */ #define FD_SETSIZE __FD_SETSIZE #ifdef __USE_MISC +/* Sometimes the fd_set member is assumed to have this type. */ +typedef __fd_mask fd_mask; + /* Number of bits per word of `fd_set' (some code assumes this is 32). */ # define NFDBITS __NFDBITS #endif /* Access macros for `fd_set'. */ -#define FD_SET(fd, fdsetp) __FD_SET ((fd), (fdsetp)) -#define FD_CLR(fd, fdsetp) __FD_CLR ((fd), (fdsetp)) -#define FD_ISSET(fd, fdsetp) __FD_ISSET ((fd), (fdsetp)) +#define FD_SET(fd, fdsetp) __FD_SET (fd, fdsetp) +#define FD_CLR(fd, fdsetp) __FD_CLR (fd, fdsetp) +#define FD_ISSET(fd, fdsetp) __FD_ISSET (fd, fdsetp) #define FD_ZERO(fdsetp) __FD_ZERO (fdsetp) +__BEGIN_DECLS + /* Check the first NFDS descriptors each in READFDS (if not NULL) for read readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS (if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out after waiting the interval specified therein. Returns the number of ready descriptors, or -1 for errors. */ -extern int select (int __nfds, __fd_set *__restrict __readfds, - __fd_set *__restrict __writefds, - __fd_set *__restrict __exceptfds, +extern int select (int __nfds, fd_set *__restrict __readfds, + fd_set *__restrict __writefds, + fd_set *__restrict __exceptfds, struct timeval *__restrict __timeout) __THROW; -#ifdef __USE_GNU -/* XXX Once/if POSIX.1g gets official this prototype will be available - when defining __USE_POSIX. */ +#ifdef __USE_XOPEN2K /* Same as above only that the TIMEOUT value is given with higher resolution and a sigmask which is been set temporarily. This version should be used. */ -extern int pselect (int __nfds, __fd_set *__restrict __readfds, - __fd_set *__restrict __writefds, - __fd_set *__restrict __exceptfds, +extern int pselect (int __nfds, fd_set *__restrict __readfds, + fd_set *__restrict __writefds, + fd_set *__restrict __exceptfds, const struct timespec *__restrict __timeout, const __sigset_t *__restrict __sigmask) __THROW; #endif |