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tprof(4) [netbsd man page]

TPROF(4)						   BSD Kernel Interfaces Manual 						  TPROF(4)

tprof -- a sampling based profiler SYNOPSIS
pseudo-device tprof DESCRIPTION
The tprof driver provides kernel services necessary for tprof(8). Specifically, it makes its backend driver collect profiling samples and provide them to the userland consumer. The API/ABI is currently undocumented and will likely change in future without keeping compatibility. SEE ALSO
tprof_amdpmi(4), tprof_pmi(4), tprof(8) AUTHORS
The tprof driver was written by YAMAMOTO Takashi. BUGS
There is no way to configure multiple backend drivers statically. BSD
December 2, 2011 BSD

Check Out this Related Man Page

PTY(4)							   BSD Kernel Interfaces Manual 						    PTY(4)

pty -- BSD-style compatibility pseudo-terminal driver SYNOPSIS
device pty DESCRIPTION
The pty driver provides support for the traditional BSD naming scheme that was used for accessing pseudo-terminals. When the device /dev/ptyXX is being opened, a new terminal shall be created with the pts(4) driver. A device node for this terminal shall be created, which has the name /dev/ttyXX. New code should not try to allocate pseudo-terminals using this interface. It is only provided for compatibility with older C libraries that tried to open such devices when posix_openpt(2) was being called. FILES
The BSD-style compatibility pseudo-terminal driver uses the following device names: /dev/pty[l-sL-S][0-9a-v] Pseudo-terminal master devices. /dev/tty[l-sL-S][0-9a-v] Pseudo-terminal slave devices. DIAGNOSTICS
posix_openpt(2), pts(4), tty(4) HISTORY
A pseudo-terminal driver appeared in 4.2BSD. BUGS
Unlike previous implementations, the master slave device nodes are destroyed when the PTY becomes unused. A call to stat(2) on a nonexistent master device will already cause a new master device node to be created. The master device can only be destroyed by opening and closing it. The pty driver cannot be unloaded, because it cannot determine if it is being used. BSD
August 20, 2008 BSD
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