Red Hat LINUX 7.2 Reference Manual page 92

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• msgmnb — Sets the maximum number of bytes in a single message queue. By default, 16384.
• msgmni — Sets the maximum number of message queue identifiers. By default, 16.
• osrelease — Lists the Linux kernel release number. This file can only be altered by changing
the kernel source and recompiling.
• ostype — Displays the type of operating system. By default, this file is set to Linux, and this
value can only be changed by changing the kernel source and recompiling.
• overflowgid and overflowuid — Defines the fixed group ID and user ID, respectively,
for use with system calls on architectures that only support 16-bit group and user IDs.
• panic — Defines the number of seconds the kernel will postpone rebooting the system when a
kernel panic is experienced. By default, the value is set to 0, which disables automatic rebooting
after a panic.
• printk — This file control a variety of settings related to printing or logging error messages.
Each error message reported by the kernel has a loglevel associated with it that defines the impor-
tance of the message. The loglevel values break down in this order:
– 0 — Kernel emergency. The system is unusable.
– 1 — Kernel alert. Action must be taken immediately.
– 2 — Condition of the kernel is considered critical.
– 3 — General kernel error condition.
– 4 — General kernel warning condition.
– 5 — Kernel notice of a normal but significant condition.
– 6 — Kernel informational message.
– 7 — Kernel debug-level messages.
Four values are found in the printk file:
6 4 1 7
Each of these values defines a different rule for dealing with error messages. The first value, called
the console loglevel, defines the lowest priority of messages that will be printed to the console.
(Note that, the lower the priority, the higher the loglevel number.) The second value sets the default
loglevel for messages without an explicit loglevel attached to them. The third value sets the lowest
possible loglevel configuration for the console loglevel. The last value sets the default value for
the console loglevel.
• rtsig-max — Configures the maximum number of POSIX realtime signals that the system
may have queued at any one time. The default value is 1024.
Chapter 4:The /proc Filesystem