SYSINFO(2-SVR4) RISC/os Reference Manual SYSINFO(2-SVR4)
NAME
sysinfo - get and set system information strings
SYNOPSIS
#include <sys/systeminfo.h>
long sysinfo (int command, char *buf, long count);
DESCRIPTION
sysinfo copies information relating to the UNIX system on
which the process is executing into the buffer pointed to by
buf; sysinfo can also set certain information where
appropriate commands are available. count is the size of
the buffer.
The POSIX P1003.1 interface sysconf [see sysconf(2)] pro-
vides a similar class of configuration information, but
returns an integer rather than a string.
The commands available are:
SI_SYSNAME
Copy into the array pointed to by buf the string that
would be returned by uname [see uname(2)] in the
sysname field. This is the name of the implementa-
tion of the operating system.
SI_HOSTNAME
Copy into the array pointed to by buf a string that
names the present host machine. This is the string
that would be returned by uname [see uname(2)] in the
nodename field. This hostname or nodename is often
the name the machine is known by locally.
The hostname is the name of this machine as a node in
some network; different networks may have different
names for the node, but presenting the nodename to
the appropriate network Directory or name-to-address
mapping service should produce a transport end point
address. The name may not be fully qualified.
Internet host names may be up to 256 bytes in length
(plus the terminating null).
SI_SET_HOSTNAME
Copy the null-terminated contents of the array
pointed to by buf into the string maintained by the
kernel whose value will be returned by succeeding
calls to sysinfo with the command SI_HOSTNAME. This
command requires that the effective user-id be
superuser.
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SI_RELEASE
Copy into the array pointed to by buf the string that
would be returned by uname [see uname(2)] in the
release field. Typical values might be 4.0 or 3.2.
SI_VERSION
Copy into the array pointed to by buf the string that
would be returned by uname [see uname(2)] in the ver-
sion field. The syntax and semantics of this string
are defined by the system provider.
SI_MACHINE
Copy into the array pointed to by buf the string that
would be returned by uname [see uname(2)] in the
machine field, e.g., 3b2 or 580.
SI_ARCHITECTURE
Copy into the array pointed to by buf a string
describing the instruction set architecture of the
current system, e.g., mc68030, m32100, or i80486.
These names may not match predefined names in the C
language compilation system.
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SI_HW_PROVIDER
Copies the name of the hardware manufacturer into the
array pointed to by buf.
SI_HW_SERIAL
Copy into the array pointed to by buf a string which
is the ASCII representation of the hardware-specific
serial number of the physical machine on which the
system call is executed. Note that this may be
implemented in Read-Only Memory, via software con-
stants set when building the operating system, or by
other means, and may contain non-numeric characters.
It is anticipated that manufacturers will not issue
the same serial number to more than one physical
machine. The pair of strings returned by
SI_HW_PROVIDER and SI_HW_SERIAL is likely to be
unique across all vendor's System V implementations.
SI_SRPC_DOMAIN
Copies the Secure Remote Procedure Call domain name
into the array pointed to by buf.
SI_SET_SRPC_DOMAIN
Set the string to be returned by sysinfo with the
SI_SRPC_DOMAIN command to the value contained in the
array pointed to by buf. This command requires that
the effective user-id be superuser.
sysinfo will fail if one or both of the following are true:
EPERM
The process does not have appropriate privilege for a
SET commands.
EINVAL
buf does not point to a valid address, or the data for
a SET command exceeds the limits established by the
implementation.
DIAGNOSTICS
Upon successful completion, the value returned indicates the
buffer size in bytes required to hold the complete value and
the terminating null character. If this value is no greater
than the value passed in count, the entire string was
copied; if this value is greater than count, the string
copied into buf has been truncated to count-1 bytes plus a
terminating null character.
Otherwise, a value of -1 is returned and errno is set to
indicate the error.
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SYSINFO(2-SVR4) RISC/os Reference Manual SYSINFO(2-SVR4)
USAGE
There is in many cases no corresponding programmatic inter-
face to set these values; such strings are typically sett-
able only by the system administrator modifying entries in
the master.d directory or the code provided by the particu-
lar OEM reading a serial number or code out of read-only
memory, or hard-coded in the version of the operating sys-
tem.
A good starting guess for count is 257, which is likely to
cover all strings returned by this interface in typical ins-
tallations.
SEE ALSO
uname(2), sysconf(2);
gethostname(3), gethostid(3).
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