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File: libc.info,  Node: Platform Type,  Next: Filesystem Handling,  Prev: Host Identification,  Up: System Management

31.2 Platform Type Identification
=================================

You can use the 'uname' function to find out some information about the
type of computer your program is running on.  This function and the
associated data type are declared in the header file 'sys/utsname.h'.

   As a bonus, 'uname' also gives some information identifying the
particular system your program is running on.  This is the same
information which you can get with functions targeted to this purpose
described in *note Host Identification::.

 -- Data Type: struct utsname
     The 'utsname' structure is used to hold information returned by the
     'uname' function.  It has the following members:

     'char sysname[]'
          This is the name of the operating system in use.

     'char release[]'
          This is the current release level of the operating system
          implementation.

     'char version[]'
          This is the current version level within the release of the
          operating system.

     'char machine[]'
          This is a description of the type of hardware that is in use.

          Some systems provide a mechanism to interrogate the kernel
          directly for this information.  On systems without such a
          mechanism, the GNU C Library fills in this field based on the
          configuration name that was specified when building and
          installing the library.

          GNU uses a three-part name to describe a system configuration;
          the three parts are CPU, MANUFACTURER and SYSTEM-TYPE, and
          they are separated with dashes.  Any possible combination of
          three names is potentially meaningful, but most such
          combinations are meaningless in practice and even the
          meaningful ones are not necessarily supported by any
          particular GNU program.

          Since the value in 'machine' is supposed to describe just the
          hardware, it consists of the first two parts of the
          configuration name: 'CPU-MANUFACTURER'.  For example, it might
          be one of these:

               '"sparc-sun"', '"i386-ANYTHING"', '"m68k-hp"',
               '"m68k-sony"', '"m68k-sun"', '"mips-dec"'

     'char nodename[]'
          This is the host name of this particular computer.  In the GNU
          C Library, the value is the same as that returned by
          'gethostname'; see *note Host Identification::.

           gethostname() is implemented with a call to uname().

     'char domainname[]'
          This is the NIS or YP domain name.  It is the same value
          returned by 'getdomainname'; see *note Host Identification::.
          This element is a relatively recent invention and use of it is
          not as portable as use of the rest of the structure.

 -- Function: int uname (struct utsname *INFO)
     Preliminary: | MT-Safe | AS-Safe | AC-Safe | *Note POSIX Safety
     Concepts::.

     The 'uname' function fills in the structure pointed to by INFO with
     information about the operating system and host machine.  A
     non-negative value indicates that the data was successfully stored.

     '-1' as the value indicates an error.  The only error possible is
     'EFAULT', which we normally don't mention as it is always a
     possibility.


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