OSS 4.0 (oss-freebsd-v4.0-1002-i386) has tendency to SIGSTOP during execution of a programs which are using OSS audio.
for example, the game vdrift:
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$ ps x | grep vdrift
70027 p8- T 2:21.85 vdrift -datadir /usr/local/share/vdrift
vdrift is using /dev/dsp0 (/dev/oss/envy24ht0/pcm0)
Process is in unkillable stopped state (neither of -KILL or -CONT signals have effect) which afaik means that it stopped on some syscall level.
As a result I can't use the same /dev/dsp device until I reboot (I can specify other programs to use other /dev/dspX, until they become STOPped too).
Unfortunately I haven't noticed any patterns in this behaviour, it has happened in the middle of a playing mp3 in beep-media-player or at the exit from the program (vdrift).
However, I have never experienced this behaviour while using mplayer.
--- ossinfo -v9 output ---
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Version info: OSS 4.0 (build 1002/200704040156) (0x00040002)
Platform: FreeBSD/i386 6.2-STABLE FreeBSD 6.2-STABLE #0: Wed May 9 13:24:48 EEST 2007 root@dh.c8h10n4o2.pri.ee:/usr/obj/usr/src/sys/DH-1
Number of audio devices: 9
Number of audio engines: 9
Number of MIDI devices: 0
Number of mixer devices: 1
Device objects
0: envy24ht0 Generic Envy24PT motherboard audio
1: vmix0 OSS transparent virtual support
MIDI devices (/dev/midi*)
Mixer devices (/dev/mixer*)
0: Generic Envy24PT motherboard aud (Mixer 0 of device object 0)
Device file /dev/oss/envy24ht0/mix0, Legacy device /dev/mixer0
Priority: 2
Caps:
Device handle: OSS-PCI-mx01
Device priority: 2
Audio devices
/dev/oss/envy24ht0/pcm0 Generic Envy24PT motherboard audio front out (device index 0)
Legacy device /dev/dsp0
Caps: TRIGGER MMAP
Modes: OUTPUT
Out engine 1: 0/Generic Envy24PT motherboard audio front out
Busy (OUT) by PID 70027 / vdrift label 'vdrift'
Engine 2: 5/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 3: 6/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 4: 7/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 5: 8/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Input formats (0x00001000):
AFMT_S32_LE - 32 bit signed little endian
Output formats (0x00001000):
AFMT_S32_LE - 32 bit signed little endian
Device handle: OSS-PCI-au01
Related mixer dev: 0
Sample rate source: 0
Preferred channel configuration: STEREO
Supported number of channels (min - max): 2 - 6
Native sample rates (min - max): 8000 - 192000 (8000,9600,11025,12000,16000,22050,24000,32000,44100,48000,88200,96000,192000)
HW Type: ANALOG_OUT Minimum latency: Not indicated
/dev/oss/envy24ht0/pcm1 Generic Envy24PT motherboard audio c/l out (device index 1)
Legacy device /dev/dsp1
Caps: TRIGGER MMAP
Modes: OUTPUT
Out engine 1: 1/Generic Envy24PT motherboard audio c/l out
Available for use
Input formats (0x00001000):
AFMT_S32_LE - 32 bit signed little endian
Output formats (0x00001000):
AFMT_S32_LE - 32 bit signed little endian
Device handle: OSS-PCI-au02
Related mixer dev: 0
Sample rate source: 0
Preferred channel configuration: STEREO
Supported number of channels (min - max): 2 - 2
Native sample rates (min - max): 8000 - 192000 (8000,9600,11025,12000,16000,22050,24000,32000,44100,48000,88200,96000,192000)
HW Type: ANALOG_OUT Minimum latency: Not indicated
/dev/oss/envy24ht0/pcm2 Generic Envy24PT motherboard audio side out (device index 2)
Legacy device /dev/dsp2
Caps: TRIGGER MMAP
Modes: OUTPUT
Out engine 1: 2/Generic Envy24PT motherboard audio side out
Available for use
Input formats (0x00001000):
AFMT_S32_LE - 32 bit signed little endian
Output formats (0x00001000):
AFMT_S32_LE - 32 bit signed little endian
Device handle: OSS-PCI-au03
Related mixer dev: 0
Sample rate source: 0
Preferred channel configuration: STEREO
Supported number of channels (min - max): 2 - 2
Native sample rates (min - max): 8000 - 192000 (8000,9600,11025,12000,16000,22050,24000,32000,44100,48000,88200,96000,192000)
HW Type: ANALOG_OUT Minimum latency: Not indicated
/dev/oss/envy24ht0/spdout Generic Envy24PT motherboard audio digital out (device index 3)
Legacy device /dev/dsp3
Caps: TRIGGER MMAP
Modes: OUTPUT
Out engine 1: 3/Generic Envy24PT motherboard audio digital out
Available for use
Input formats (0x00001400):
AFMT_AC3 - AC3 (Dolby Digital) encoded audio
AFMT_S32_LE - 32 bit signed little endian
Output formats (0x00001400):
AFMT_AC3 - AC3 (Dolby Digital) encoded audio
AFMT_S32_LE - 32 bit signed little endian
Device handle: OSS-PCI-au04
Related mixer dev: 0
Sample rate source: 0
Preferred channel configuration: STEREO
Supported number of channels (min - max): 2 - 2
Native sample rates (min - max): 8000 - 192000 (8000,9600,11025,12000,16000,22050,24000,32000,44100,48000,88200,96000,192000)
HW Type: DIGITAL_OUT Minimum latency: Not indicated
/dev/oss/envy24ht0/pcmin0 Generic Envy24PT motherboard audio analog in (device index 4)
Legacy device /dev/dsp4
Caps: TRIGGER MMAP
Modes: INPUT
In engine 1: 4/Generic Envy24PT motherboard audio analog in
Available for use
Engine 2: 5/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 3: 6/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 4: 7/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 5: 8/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Input formats (0x00001000):
AFMT_S32_LE - 32 bit signed little endian
Output formats (0x00001000):
AFMT_S32_LE - 32 bit signed little endian
Device handle: OSS-PCI-au05
Related mixer dev: 0
Sample rate source: 0
Preferred channel configuration: STEREO
Supported number of channels (min - max): 1 - 2
Native sample rates (min - max): 8000 - 192000 (8000,9600,11025,12000,16000,22050,24000,32000,44100,48000,88200,96000,192000)
HW Type: ANALOG_IN Minimum latency: Not indicated
/dev/oss/vmix0/pcm0 Generic Envy24PT motherboard audio front out (VMIX0) (device index 5)
Legacy device /dev/dsp5
Caps: DUPLEX TRIGGER MMAP VIRTUAL
Modes: IN/OUT
Engine 1: 5/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 2: 6/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 3: 7/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 4: 8/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Input formats (0x00005010):
AFMT_S16_LE - 16 bit signed little endian
AFMT_S32_LE - 32 bit signed little endian
AFMT_FLOAT - Single precision floating point (native endianess)
Output formats (0x00005010):
AFMT_S16_LE - 16 bit signed little endian
AFMT_S32_LE - 32 bit signed little endian
AFMT_FLOAT - Single precision floating point (native endianess)
Device handle: vmix0-au01
Related mixer dev: 0
Sample rate source: 0
Preferred channel configuration: Not indicated
Supported number of channels (min - max): 2 - 6
Native sample rates (min - max): 48000 - 48000
HW Type: Not indicated.
Minimum latency: Not indicated
/dev/oss/vmix0/pcm1 Generic Envy24PT motherboard audio front out (VMIX0) (device index 6)
Legacy device /dev/dsp6
Caps: DUPLEX TRIGGER MMAP VIRTUAL SHADOW HIDDEN
Modes: IN/OUT
Engine 1: 6/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 2: 7/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 3: 8/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Input formats (0x00005010):
AFMT_S16_LE - 16 bit signed little endian
AFMT_S32_LE - 32 bit signed little endian
AFMT_FLOAT - Single precision floating point (native endianess)
Output formats (0x00005010):
AFMT_S16_LE - 16 bit signed little endian
AFMT_S32_LE - 32 bit signed little endian
AFMT_FLOAT - Single precision floating point (native endianess)
Device handle: vmix0-au02
Related mixer dev: 0
Sample rate source: 0
Preferred channel configuration: Not indicated
Supported number of channels (min - max): 2 - 6
Native sample rates (min - max): 48000 - 48000
HW Type: Not indicated.
Minimum latency: Not indicated
/dev/oss/vmix0/pcm2 Generic Envy24PT motherboard audio front out (VMIX0) (device index 7)
Legacy device /dev/dsp7
Caps: DUPLEX TRIGGER MMAP VIRTUAL SHADOW HIDDEN
Modes: IN/OUT
Engine 1: 7/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Engine 2: 8/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Input formats (0x00005010):
AFMT_S16_LE - 16 bit signed little endian
AFMT_S32_LE - 32 bit signed little endian
AFMT_FLOAT - Single precision floating point (native endianess)
Output formats (0x00005010):
AFMT_S16_LE - 16 bit signed little endian
AFMT_S32_LE - 32 bit signed little endian
AFMT_FLOAT - Single precision floating point (native endianess)
Device handle: vmix0-au03
Related mixer dev: 0
Sample rate source: 0
Preferred channel configuration: Not indicated
Supported number of channels (min - max): 2 - 6
Native sample rates (min - max): 48000 - 48000
HW Type: Not indicated.
Minimum latency: Not indicated
/dev/oss/vmix0/pcm3 Generic Envy24PT motherboard audio front out (VMIX0) (device index 8)
Legacy device /dev/dsp8
Caps: DUPLEX TRIGGER MMAP VIRTUAL SHADOW HIDDEN
Modes: IN/OUT
Engine 1: 8/Generic Envy24PT motherboard audio front out (VMIX0)
Available for use
Input formats (0x00005010):
AFMT_S16_LE - 16 bit signed little endian
AFMT_S32_LE - 32 bit signed little endian
AFMT_FLOAT - Single precision floating point (native endianess)
Output formats (0x00005010):
AFMT_S16_LE - 16 bit signed little endian
AFMT_S32_LE - 32 bit signed little endian
AFMT_FLOAT - Single precision floating point (native endianess)
Device handle: vmix0-au04
Related mixer dev: 0
Sample rate source: 0
Preferred channel configuration: Not indicated
Supported number of channels (min - max): 2 - 6
Native sample rates (min - max): 48000 - 48000
HW Type: Not indicated.
Minimum latency: Not indicated