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ba0a6c9f6f
In order to direct the SIGIO signal to a particular thread of a
multi-threaded application we cannot, like suggested by the manpage, put a
TID into the regular fcntl(F_SETOWN) call. It will still be send to the
whole process of which that thread is part.
Since people do want to properly direct SIGIO we introduce F_SETOWN_EX.
The need to direct SIGIO comes from self-monitoring profiling such as with
perf-counters. Perf-counters uses SIGIO to notify that new sample data is
available. If the signal is delivered to the same task that generated the
new sample it can augment that data by inspecting the task's user-space
state right after it returns from the kernel. This is esp. convenient
for interpreted or virtual machine driven environments.
Both F_SETOWN_EX and F_GETOWN_EX take a pointer to a struct f_owner_ex
as argument:
struct f_owner_ex {
int type;
pid_t pid;
};
Where type is one of F_OWNER_TID, F_OWNER_PID or F_OWNER_GID.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Tested-by: stephane eranian <eranian@googlemail.com>
Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
#ifndef _PARISC_FCNTL_H
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#define _PARISC_FCNTL_H
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/* open/fcntl - O_SYNC is only implemented on blocks devices and on files
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located on an ext2 file system */
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#define O_APPEND 000000010
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#define O_BLKSEEK 000000100 /* HPUX only */
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#define O_CREAT 000000400 /* not fcntl */
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#define O_EXCL 000002000 /* not fcntl */
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#define O_LARGEFILE 000004000
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#define O_SYNC 000100000
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#define O_NONBLOCK 000200004 /* HPUX has separate NDELAY & NONBLOCK */
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#define O_NOCTTY 000400000 /* not fcntl */
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#define O_DSYNC 001000000 /* HPUX only */
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#define O_RSYNC 002000000 /* HPUX only */
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#define O_NOATIME 004000000
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#define O_CLOEXEC 010000000 /* set close_on_exec */
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#define O_DIRECTORY 000010000 /* must be a directory */
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#define O_NOFOLLOW 000000200 /* don't follow links */
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#define O_INVISIBLE 004000000 /* invisible I/O, for DMAPI/XDSM */
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#define F_GETLK64 8
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#define F_SETLK64 9
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#define F_SETLKW64 10
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#define F_GETOWN 11 /* for sockets. */
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#define F_SETOWN 12 /* for sockets. */
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#define F_SETSIG 13 /* for sockets. */
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#define F_GETSIG 14 /* for sockets. */
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#define F_GETOWN_EX 15
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#define F_SETOWN_EX 16
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/* for posix fcntl() and lockf() */
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#define F_RDLCK 01
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#define F_WRLCK 02
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#define F_UNLCK 03
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#include <asm-generic/fcntl.h>
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#endif
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