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| <h3 class="section">30.2 Platform Type Identification</h3> |
| |
| <p>You can use the <code>uname</code> 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 |
| <samp><span class="file">sys/utsname.h</span></samp>. |
| <a name="index-sys_002futsname_002eh-3455"></a> |
| As a bonus, <code>uname</code> also gives some information identifying the |
| particular system your program is running on. This is the same information |
| which you can get with functions targetted to this purpose described in |
| <a href="Host-Identification.html#Host-Identification">Host Identification</a>. |
| |
| <!-- sys/utsname.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Data Type: <b>struct utsname</b><var><a name="index-struct-utsname-3456"></a></var><br> |
| <blockquote><p>The <code>utsname</code> structure is used to hold information returned |
| by the <code>uname</code> function. It has the following members: |
| |
| <dl> |
| <dt><code>char sysname[]</code><dd>This is the name of the operating system in use. |
| |
| <br><dt><code>char release[]</code><dd>This is the current release level of the operating system implementation. |
| |
| <br><dt><code>char version[]</code><dd>This is the current version level within the release of the operating |
| system. |
| |
| <br><dt><code>char machine[]</code><dd>This is a description of the type of hardware that is in use. |
| |
| <p>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. |
| |
| <p>GNU uses a three-part name to describe a system configuration; the three |
| parts are <var>cpu</var>, <var>manufacturer</var> and <var>system-type</var>, 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. |
| |
| <p>Since the value in <code>machine</code> is supposed to describe just the |
| hardware, it consists of the first two parts of the configuration name: |
| ‘<samp><var>cpu</var><span class="samp">-</span><var>manufacturer</var></samp>’. For example, it might be one of these: |
| |
| <blockquote> |
| <code>"sparc-sun"</code>, |
| <code>"i386-</code><var>anything</var><code>"</code>, |
| <code>"m68k-hp"</code>, |
| <code>"m68k-sony"</code>, |
| <code>"m68k-sun"</code>, |
| <code>"mips-dec"</code> |
| </blockquote> |
| |
| <br><dt><code>char nodename[]</code><dd>This is the host name of this particular computer. In the GNU C |
| library, the value is the same as that returned by <code>gethostname</code>; |
| see <a href="Host-Identification.html#Host-Identification">Host Identification</a>. |
| |
| <p>gethostname() is implemented with a call to uname(). |
| |
| <br><dt><code>char domainname[]</code><dd>This is the NIS or YP domain name. It is the same value returned by |
| <code>getdomainname</code>; see <a href="Host-Identification.html#Host-Identification">Host Identification</a>. This element |
| is a relatively recent invention and use of it is not as portable as |
| use of the rest of the structure. |
| |
| <!-- getdomainname() is implemented with a call to uname(). --> |
| </dl> |
| </p></blockquote></div> |
| |
| <!-- sys/utsname.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Function: int <b>uname</b> (<var>struct utsname *info</var>)<var><a name="index-uname-3457"></a></var><br> |
| <blockquote><p>The <code>uname</code> function fills in the structure pointed to by |
| <var>info</var> with information about the operating system and host machine. |
| A non-negative value indicates that the data was successfully stored. |
| |
| <p><code>-1</code> as the value indicates an error. The only error possible is |
| <code>EFAULT</code>, which we normally don't mention as it is always a |
| possibility. |
| </p></blockquote></div> |
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