SND_PCM_LIB_IOCTL(9) Sound Devices 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.
Returns zero if successful, or a negative error code on failure.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 SND_PCM_LIB_IOCTL(9)
Check Out this Related Man Page
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
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