check_utility_compat(3) [freebsd man page]

CHECK_UTILITY_COMPAT(3) 				   BSD Library Functions Manual 				   CHECK_UTILITY_COMPAT(3)

NAME

     check_utility_compat -- determine whether a utility should be compatible

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     check_utility_compat(const char *utility);

DESCRIPTION

     The check_utility_compat() function checks whether utility should behave in a traditional (FreeBSD 4.7-compatible) manner, or in accordance
     with IEEE Std 1003.1-2001 (``POSIX.1'').  The configuration is given as a comma-separated list of utility names; if the list is present but
     empty, all supported utilities assume their most compatible mode.	The check_utility_compat() function first checks for an environment vari-
     able named _COMPAT_FreeBSD_4.  If that environment variable does not exist, then check_utility_compat() will attempt to read the contents of
     a symbolic link named /etc/compat-FreeBSD-4-util.	If no configuration is found, compatibility mode is disabled.

RETURN VALUES

     The check_utility_compat() function returns zero if utility should implement strict IEEE Std 1003.1-2001 (``POSIX.1'') behavior, and nonzero
     otherwise.

FILES

     /etc/compat-FreeBSD-4-util  If present, a symbolic link whose expansion gives system-wide default settings for the check_utility_compat()
				 function.

ERRORS

     No errors are detected.

HISTORY

     The check_utility_compat() function first appeared in FreeBSD 5.0.

AUTHORS

     This manual page was written by Garrett Wollman <wollman@FreeBSD.org>.

BSD
								 October 27, 2002							       BSD

PSELECT(3)						   BSD Library Functions Manual 						PSELECT(3)

NAME

     pselect -- synchronous I/O multiplexing a la POSIX.1g

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     pselect(int nfds, fd_set *restrict readfds, fd_set *restrict writefds, fd_set *restrict errorfds, const struct timespec *restrict timeout,
	 const sigset_t *restrict sigmask);

DESCRIPTION

     The pselect() function was introduced by IEEE Std 1003.1g-2000 (``POSIX.1'') as a slightly stronger version of select(2).	The nfds, readfds,
     writefds, and errorfds arguments are all identical to the analogous arguments of select().  The timeout argument in pselect() points to a
     const struct timespec, rather than the (modifiable) struct timeval used by select(); as in select(), a null pointer may be passed to indicate
     that pselect() should wait indefinitely.  Finally, sigmask specifies a signal mask which is set while waiting for input.  When pselect()
     returns, the original signal mask is restored.

     See select(2) for a more detailed discussion of the semantics of this interface, and for macros used to manipulate the fd_set data type.

IMPLEMENTATION NOTES

     The pselect() function is implemented in the C library as a wrapper around select().

RETURN VALUES

     The pselect() function returns the same values and under the same conditions as select().

ERRORS

     The pselect() function may fail for any of the reasons documented for select(2) and (if a signal mask is provided) sigprocmask(2).

SEE ALSO

     kqueue(2), poll(2), select(2), sigprocmask(2)

STANDARDS

     The pselect() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     The pselect() function first appeared in FreeBSD 5.0.

AUTHORS

     The pselect() function and this manual page were written by Garrett Wollman <wollman@FreeBSD.org>.

BSD
								   June 16, 2002							       BSD