snd_pcm_lib_ioctl(9) [centos man page]

SND_PCM_LIB_IOCTL(9)						      PCM API						      SND_PCM_LIB_IOCTL(9)

NAME

       snd_pcm_lib_ioctl - a generic PCM ioctl callback

SYNOPSIS

       int snd_pcm_lib_ioctl(struct snd_pcm_substream * substream, unsigned int cmd, void * arg);

ARGUMENTS

       substream
	   the pcm substream instance

       cmd
	   ioctl command

       arg
	   ioctl argument

DESCRIPTION

       Processes the generic ioctl commands for PCM. Can be passed as the ioctl callback for PCM ops.

RETURN

       Zero if successful, or a negative error code on failure.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						      SND_PCM_LIB_IOCTL(9)

FSETOWN(9)						   BSD Kernel Developer's Manual						FSETOWN(9)

NAME

     fsetown, fgetown, fownsignal -- file descriptor owner handling functions

SYNOPSIS

     #include <sys/file.h>

     int
     fsetown(struct lwp *l, pid_t *pgid, int cmd, const void *data);

     int
     fgetown(struct lwp *l, pid_t pgid, int cmd, void *data);

     void
     fownsignal(pid_t pgid, int signo, int code, int band, void *fdescdata);

DESCRIPTION

     These functions handle file descriptor owner related ioctls and related signal delivery.  Device drivers and other parts of the kernel call
     these functions from ioctl entry functions or I/O notification functions.

     fsetown() sets the owner of file.	cmd is an ioctl command, one of SIOCSPGRP, FIOSETOWN, and TIOCSPGRP.  data is interpreted as a pointer to
     a signed integer, the integer being the ID of the owner.  The cmd determines how exactly data should be interpreted.  If cmd is TIOCSPGRP,
     the ID needs to be positive and is interpreted as process group ID.  For SIOCSPGRP and FIOSETOWN, the passed ID is the process ID if posi-
     tive, or the process group ID if negative.

     fgetown() returns the current owner of the file.  cmd is an ioctl command, one of SIOCGPGRP, FIOGETOWN, and TIOCGPGRP.  data is interpreted
     as a pointer to a signed integer, and the value is set according to the passed cmd.  For TIOCGPGRP, the returned data value is positive
     process group ID if the owner is the process group, or negative process ID if the owner is a process.  For other ioctls, the returned value
     is the positive process ID if the owner is a process, or the negative process group ID if the owner is a process group.

     fownsignal() schedules the signo signal to be sent to the current file descriptor owner.  The signals typically used with this function are
     SIGIO and SIGURG.	The code and band arguments are sent along with the signal as additional signal specific information if SA_SIGINFO is
     activated.  If the information is not available from the context of the fownsignal() call, these should be passed as zero.  fdescdata is used
     to lookup the file descriptor for SA_SIGINFO signals.  If it is specified, the file descriptor number is sent along with the signal as addi-
     tional signal specific information.  If file descriptor data pointer is not available in the context of the fownsignal() call, NULL should be
     used instead.

     Note that a fcntl(2) F_SETOWN request is translated by the kernel to a FIOSETOWN ioctl, and F_GETOWN is translated to FIOGETOWN.  This is
     done transparently by generic code, before the device- or subsystem-specific ioctl entry function is called.

SEE ALSO

     fcntl(2), siginfo(2), signal(7), ioctl(9), signal(9)

HISTORY

     These kernel functions appeared in NetBSD 2.0.

BSD
								 December 20, 2005							       BSD