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<h3 class="section">9.1 <code>ISO_FORTRAN_ENV</code></h3>
<dl>
<dt><em>Standard</em>:<dd>Fortran 2003 and later, except when otherwise noted
</dl>
<p>The <code>ISO_FORTRAN_ENV</code> module provides the following scalar default-integer
named constants:
<dl>
<dt><code>ATOMIC_INT_KIND</code>:<dd>Default-kind integer constant to be used as kind parameter when defining
integer variables used in atomic operations. (Fortran 2008 or later.)
<br><dt><code>ATOMIC_LOGICAL_KIND</code>:<dd>Default-kind integer constant to be used as kind parameter when defining
logical variables used in atomic operations. (Fortran 2008 or later.)
<br><dt><code>CHARACTER_KINDS</code>:<dd>Default-kind integer constant array of rank one containing the supported kind
parameters of the <code>CHARACTER</code> type. (Fortran 2008 or later.)
<br><dt><code>CHARACTER_STORAGE_SIZE</code>:<dd>Size in bits of the character storage unit.
<br><dt><code>ERROR_UNIT</code>:<dd>Identifies the preconnected unit used for error reporting.
<br><dt><code>FILE_STORAGE_SIZE</code>:<dd>Size in bits of the file-storage unit.
<br><dt><code>INPUT_UNIT</code>:<dd>Identifies the preconnected unit identified by the asterisk
(<code>*</code>) in <code>READ</code> statement.
<br><dt><code>INT8</code>, <code>INT16</code>, <code>INT32</code>, <code>INT64</code>:<dd>Kind type parameters to specify an INTEGER type with a storage
size of 16, 32, and 64 bits. It is negative if a target platform
does not support the particular kind. (Fortran 2008 or later.)
<br><dt><code>INTEGER_KINDS</code>:<dd>Default-kind integer constant array of rank one containing the supported kind
parameters of the <code>INTEGER</code> type. (Fortran 2008 or later.)
<br><dt><code>IOSTAT_END</code>:<dd>The value assigned to the variable passed to the <code>IOSTAT=</code> specifier of
an input/output statement if an end-of-file condition occurred.
<br><dt><code>IOSTAT_EOR</code>:<dd>The value assigned to the variable passed to the <code>IOSTAT=</code> specifier of
an input/output statement if an end-of-record condition occurred.
<br><dt><code>IOSTAT_INQUIRE_INTERNAL_UNIT</code>:<dd>Scalar default-integer constant, used by <code>INQUIRE</code> for the
<code>IOSTAT=</code> specifier to denote an that a unit number identifies an
internal unit. (Fortran 2008 or later.)
<br><dt><code>NUMERIC_STORAGE_SIZE</code>:<dd>The size in bits of the numeric storage unit.
<br><dt><code>LOGICAL_KINDS</code>:<dd>Default-kind integer constant array of rank one containing the supported kind
parameters of the <code>LOGICAL</code> type. (Fortran 2008 or later.)
<br><dt><code>OUTPUT_UNIT</code>:<dd>Identifies the preconnected unit identified by the asterisk
(<code>*</code>) in <code>WRITE</code> statement.
<br><dt><code>REAL32</code>, <code>REAL64</code>, <code>REAL128</code>:<dd>Kind type parameters to specify a REAL type with a storage
size of 32, 64, and 128 bits. It is negative if a target platform
does not support the particular kind. (Fortran 2008 or later.)
<br><dt><code>REAL_KINDS</code>:<dd>Default-kind integer constant array of rank one containing the supported kind
parameters of the <code>REAL</code> type. (Fortran 2008 or later.)
<br><dt><code>STAT_LOCKED</code>:<dd>Scalar default-integer constant used as STAT= return value by <code>LOCK</code> to
denote that the lock variable is locked by the executing image. (Fortran 2008
or later.)
<br><dt><code>STAT_LOCKED_OTHER_IMAGE</code>:<dd>Scalar default-integer constant used as STAT= return value by <code>UNLOCK</code> to
denote that the lock variable is locked by another image. (Fortran 2008 or
later.)
<br><dt><code>STAT_STOPPED_IMAGE</code>:<dd>Positive, scalar default-integer constant used as STAT= return value if the
argument in the statement requires synchronisation with an image, which has
initiated the termination of the execution. (Fortran 2008 or later.)
<br><dt><code>STAT_UNLOCKED</code>:<dd>Scalar default-integer constant used as STAT= return value by <code>UNLOCK</code> to
denote that the lock variable is unlocked. (Fortran 2008 or later.)
</dl>
<p>The module also provides the following intrinsic procedures:
<a href="COMPILER_005fOPTIONS.html#COMPILER_005fOPTIONS">COMPILER_OPTIONS</a> and <a href="COMPILER_005fVERSION.html#COMPILER_005fVERSION">COMPILER_VERSION</a>.
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