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android_kernel_motorola_sm6225/drivers/char
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Jeff Dike 9a6f70bbed random: add async notification support to /dev/random 
Add async notification support to /dev/random.

A little test case is below.  Without this patch, you get:

$ ./async-random
Drained the pool
Found more randomness

With it, you get:

$ ./async-random
Drained the pool
SIGIO
Found more randomness

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>

static void handler(int sig)
{
        printf("SIGIO\n");
}

int main(int argc, char **argv)
{
        int fd, n, err, flags;

        if(signal(SIGIO, handler) < 0){
                perror("setting SIGIO handler");
                exit(1);
        }

        fd = open("/dev/random", O_RDONLY);
        if(fd < 0){
                perror("open");
                exit(1);
        }

        flags = fcntl(fd, F_GETFL);
        if (flags < 0){
                perror("getting flags");
                exit(1);
        }

        flags |= O_NONBLOCK;
        if (fcntl(fd, F_SETFL, flags) < 0){
                perror("setting flags");
                exit(1);
        }

        while((err = read(fd, &n, sizeof(n))) > 0) ;

        if(err == 0){
                printf("random returned 0\n");
                exit(1);
        }
        else if(errno != EAGAIN){
                perror("read");
                exit(1);
        }

        flags |= O_ASYNC;
        if (fcntl(fd, F_SETFL, flags) < 0){
                perror("setting flags");
                exit(1);
        }

        if (fcntl(fd, F_SETOWN, getpid()) < 0) {
                perror("Setting SIGIO");
                exit(1);
        }

        printf("Drained the pool\n");
        read(fd, &n, sizeof(n));
        printf("Found more randomness\n");

        return(0);
}

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29 08:06:25 -07:00
..
agp agp: convert drivers/char/agp/frontend.c to use unlocked_ioctl 2008-04-26 18:43:20 +10:00
drm drivers: atm, char fix integer as NULL pointer warnings 2008-04-28 17:29:18 -07:00
hw_random Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2008-04-21 15:57:09 -07:00
ip2 proc: switch /proc/ip2mem to seq_file interface 2008-04-29 08:06:19 -07:00
ipmi ipmi: fix return from atca_oem_poweroff_hook 2008-04-29 08:06:16 -07:00
mwave arm/mach-integrator/time.c, mwave: revert portions of recent irq cleanups 2008-04-24 08:35:37 -04:00
pcmcia ipwireless: remove dead code 2008-04-29 08:06:01 -07:00
rio drivers: fix integer as NULL pointer warnings 2008-04-28 17:31:13 -07:00
tpm drivers/char: minor irq handler cleanups 2008-04-20 19:03:43 -04:00
xilinx_hwicap [POWERPC] char/xilinx_hwicap/ section fix 2008-04-24 20:58:02 +10:00
.gitignore
amiserial.c some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
apm-emulation.c proc: switch /proc/apm to seq_file interface 2008-04-29 08:06:19 -07:00
applicom.c Char: applicom, use pci_match_id 2008-02-08 09:22:41 -08:00
applicom.h
bfin-otp.c Blackfin char driver for Blackfin on-chip OTP memory (v3) 2008-04-25 08:04:56 +08:00
briq_panel.c [POWERPC] Remove dead code for preventing pread() and pwrite() calls 2007-07-10 22:03:26 +10:00
cd1865.h
ChangeLog
consolemap.c unicode diacritics support 2007-10-17 08:42:52 -07:00
cp437.uni
cs5535_gpio.c drivers: fix integer as NULL pointer warnings 2008-04-28 17:31:13 -07:00
cyclades.c Char: cyclades, fix potential NULL dereference 2007-10-23 08:32:06 -07:00
defkeymap.c_shipped Fix default compose table initialization 2008-03-03 14:53:16 -08:00
defkeymap.map
digi1.h
digiFep1.h
digiPCI.h
ds1286.c [CHAR] ds1286: Fix handling of seconds in RTC_ALM_SET ioctl. 2007-03-08 01:10:30 +00:00
ds1302.c [PATCH] DS1302: local_irq_disable() is redundant after local_irq_save() 2007-02-12 09:48:30 -08:00
ds1620.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
dsp56k.c long vs. unsigned long - low-hanging fruits in drivers 2007-10-14 12:41:51 -07:00
dtlk.c dtlk: fix error checks in module_init() 2007-05-08 11:15:09 -07:00
efirtc.c drivers/char/: Spelling fixes 2008-02-03 17:11:42 +02:00
epca.c drivers/char/: Spelling fixes 2008-02-03 17:11:42 +02:00
epca.h Char: char/serial, remove SERIAL_TYPE_NORMAL redefines 2008-02-07 08:42:33 -08:00
epcaconfig.h
esp.c drivers/char/esp.c: fix bootup lockup 2008-03-07 10:05:13 -08:00
generic_nvram.c [PATCH] mark struct file_operations const 3 2007-02-12 09:48:45 -08:00
generic_serial.c drivers: Remove unnecessary inclusions of asm/semaphore.h 2008-04-18 22:16:32 -04:00
genrtc.c Char: genrtc, use wait_event_interruptible 2007-07-16 09:05:44 -07:00
hangcheck-timer.c drivers/char/: Spelling fixes 2008-02-03 17:11:42 +02:00
hpet.c x86: revert assign IRQs to hpet timer 2008-04-04 18:36:49 +02:00
hvc_beat.c [POWERPC] hvcbeat: Fix buffer manipulation 2008-04-17 07:46:10 +10:00
hvc_console.c drivers/char: use LIST_HEAD instead of LIST_HEAD_INIT 2008-02-06 10:41:07 -08:00
hvc_console.h
hvc_iseries.c [POWERPC] init and exit markings for hvc_iseries 2007-07-22 21:30:59 +10:00
hvc_rtas.c [POWERPC] hvc_rtas_init() must be __init 2008-02-14 22:11:02 +11:00
hvc_vio.c [POWERPC] Rename device_is_compatible to of_device_is_compatible 2007-05-07 20:31:14 +10:00
hvc_xen.c xen: use the hvc console infrastructure for Xen console 2007-07-18 08:47:44 -07:00
hvcs.c drivers/char: use LIST_HEAD instead of LIST_HEAD_INIT 2008-02-06 10:41:07 -08:00
hvsi.c [POWERPC] Rename get_property to of_get_property: partial drivers 2007-04-27 15:51:56 +10:00
i8k.c drivers: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
ip27-rtc.c ip27-rtc: convert ioctl to unlocked_ioctl 2008-02-06 10:41:14 -08:00
isicom.c drivers/char/isicom.c: correct use of ! and & 2008-03-04 16:35:15 -08:00
istallion.c Char: istallion, remove hangup bottomhalf 2008-02-07 08:42:34 -08:00
Kconfig make /dev/kmem a config option 2008-04-29 08:05:59 -07:00
keyboard.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2008-04-25 12:38:14 -07:00
lcd.c [MIPS] Delete duplicate inclusion of <linux/delay.h>. 2007-08-27 02:16:59 +01:00
lcd.h [MIPS] Add MTD device support for Cobalt 2007-02-20 17:11:55 +00:00
lp.c Parallel port: convert port_mutex to the mutex API 2008-02-06 10:41:01 -08:00
Makefile Blackfin char driver for Blackfin on-chip OTP memory (v3) 2008-04-25 08:04:56 +08:00
mbcs.c MBCS: convert dmareadlock to mutex 2008-02-07 08:42:25 -08:00
mbcs.h MBCS: convert dmareadlock to mutex 2008-02-07 08:42:25 -08:00
mem.c make /dev/kmem a config option 2008-04-29 08:05:59 -07:00
misc.c drivers: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
mmtimer.c Remove fs.h from mm.h 2007-07-29 17:09:29 -07:00
moxa.c moxa: first pass at termios reporting 2008-02-08 09:22:24 -08:00
mspec.c vm audit: add VM_DONTEXPAND to mmap for drivers that need it 2008-02-04 07:55:38 -08:00
mxser.c Char: mxser, add support for CP-114UL 2008-02-07 08:42:35 -08:00
mxser.h Char: mxser, remove it 2008-02-07 08:42:34 -08:00
n_hdlc.c drivers: fix integer as NULL pointer warnings 2008-04-28 17:31:13 -07:00
n_r3964.c Char: n_r3964, use wait_event_interruptible 2007-07-16 09:05:44 -07:00
n_tty.c drivers/char/n_tty.c misannotated prototype 2008-03-30 14:20:23 -07:00
nozomi.c fix iomem misannotations in nozomi 2008-03-30 14:20:23 -07:00
nsc_gpio.c [PATCH] struct path: convert char-drivers 2006-12-08 08:28:44 -08:00
nvram.c COBALT: remove all references to Cobalt NVRAM 2007-07-16 09:05:47 -07:00
nwbutton.c [PATCH] Char: timers cleanup 2007-02-12 09:48:30 -08:00
nwbutton.h
nwflash.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
pc8736x_gpio.c
ppdev.c [PARPORT] Remove unused 'irq' argument from parport irq functions 2007-10-23 19:53:16 -04:00
ps3flash.c ps3: FLASH ROM Storage Driver 2007-07-21 17:49:16 -07:00
pty.c sysctl: simplify the pty sysctl logic 2007-10-18 14:37:23 -07:00
random.c random: add async notification support to /dev/random 2008-04-29 08:06:25 -07:00
raw.c cdev: remove unneeded setting of cdev names 2007-10-12 14:51:02 -07:00
riscom8.c char: riscom, fix rc_board indexing 2008-03-13 13:11:43 -07:00
riscom8.h Char: riscom8, remove wakeup and hangup bottomhalves 2008-02-07 08:42:34 -08:00
riscom8_reg.h
rocket.c drivers/char/rocket portability fixes 2008-03-19 19:42:36 -07:00
rocket.h
rocket_int.h drivers/char/rocket portability fixes 2008-03-19 19:42:36 -07:00
rtc.c drivers: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
scc.h
scx200_gpio.c
selection.c Kernel utf-8 handling 2007-07-16 09:05:46 -07:00
ser_a2232.c Amiga serial driver: port_write_mutex fixup 2008-02-06 10:41:08 -08:00
ser_a2232.h
ser_a2232fw.ax
ser_a2232fw.h
serial167.c Char: serial167, remove bottomhalf 2008-02-07 08:42:34 -08:00
snsc.c Convert from class_device to device in drivers/char 2007-10-12 14:51:04 -07:00
snsc.h Convert asm/semaphore.h users to linux/semaphore.h 2008-04-18 22:22:54 -04:00
snsc_event.c [IA64] drivers/char/snsc_event.c:206: warning: unused variable `p' 2007-05-10 13:23:05 -07:00
sonypi.c sonypi: Storage class should be before const qualifier 2008-04-21 22:29:37 +00:00
specialix.c drivers/char: minor irq handler cleanups 2008-04-20 19:03:43 -04:00
specialix_io8.h Char: specialix, remove bottomhalves 2008-02-07 08:42:34 -08:00
stallion.c drivers/char: minor irq handler cleanups 2008-04-20 19:03:43 -04:00
sx.c Use helpers to obtain task pid in printks 2007-10-19 11:53:43 -07:00
sx.h Char: char/serial, remove SERIAL_TYPE_NORMAL redefines 2008-02-07 08:42:33 -08:00
sxboards.h
sxwindow.h
synclink.c synclink drivers bool conversion 2008-04-28 08:58:29 -07:00
synclink_gt.c synclink drivers bool conversion 2008-04-28 08:58:29 -07:00
synclinkmp.c char: make functions static in synclinkmp.c 2008-04-28 08:58:29 -07:00
sysrq.c sysrq: add show-backtrace-on-all-cpus function 2008-04-29 08:06:03 -07:00
tb0219.c [PATCH] struct path: convert char-drivers 2006-12-08 08:28:44 -08:00
tlclk.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
toshiba.c drivers: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
tty_audit.c tty_audit: fix checkpatch complaint 2008-02-08 09:22:25 -08:00
tty_io.c drivers: atm, char fix integer as NULL pointer warnings 2008-04-28 17:29:18 -07:00
tty_ioctl.c tty_ioctl: drag screaming into compliance with the coding style 2008-02-08 09:22:25 -08:00
vc_screen.c use mutex instead of semaphore in virtual console driver 2007-05-08 11:15:33 -07:00
viocons.c [POWERPC] iSeries: fix viocons init 2006-12-20 16:37:48 +11:00
viotape.c drivers: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
virtio_console.c virtio: simplify config mechanism. 2008-02-04 23:49:57 +11:00
vme_scc.c m68k: remove empty ->setup is several consoles 2007-07-20 08:24:49 -07:00
vr41xx_giu.c [MIPS] Separate platform_device registration for VR41xx GPIO 2007-07-12 17:41:15 +01:00
vt.c vt: fix background color on line feed 2008-04-29 08:06:06 -07:00
vt_ioctl.c add CONFIG_VT_UNICODE 2007-10-17 08:42:56 -07:00