09-29-2001
When a program is loaded by the OS,
it is automatically given 3 open files...
stdin -> fd=0
stdout -> fd=1
stderr -> fd=2
By closing all fd's you guarantee that
the next file you open...
open(...)
...will be assigned fd 0
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sysmsg(7D) Devices sysmsg(7D)
NAME
sysmsg - system message routing to console devices
SYNOPSIS
/dev/sysmsg
DESCRIPTION
The file /dev/sysmsg routes output to a variable set of console devices. Writes to /dev/sysmsg are always directed to the system console
/dev/console, and are in addition directed to a set of auxiliary console devices managed by consadm(1M).
Only root has permission to write to this device.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsr |
+-----------------------------+-----------------------------+
|Interface Stability |Stable |
+-----------------------------+-----------------------------+
SEE ALSO
consadm(1M), syslogd(1M) , attributes(5), console(7D)
SunOS 5.10 13 Oct 1998 sysmsg(7D)