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<h4 class="subsection">31.4.2 Constants for <code>sysconf</code> Parameters</h4>
<p>Here are the symbolic constants for use as the <var>parameter</var> argument
to <code>sysconf</code>. The values are all integer constants (more
specifically, enumeration type values).
<dl>
<!-- unistd.h -->
<!-- POSIX.1 -->
<dt><code>_SC_ARG_MAX</code><a name="index-g_t_005fSC_005fARG_005fMAX-3525"></a><dd>Inquire about the parameter corresponding to <code>ARG_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_CHILD_MAX</code><a name="index-g_t_005fSC_005fCHILD_005fMAX-3526"></a><dd>Inquire about the parameter corresponding to <code>CHILD_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_OPEN_MAX</code><a name="index-g_t_005fSC_005fOPEN_005fMAX-3527"></a><dd>Inquire about the parameter corresponding to <code>OPEN_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_STREAM_MAX</code><a name="index-g_t_005fSC_005fSTREAM_005fMAX-3528"></a><dd>Inquire about the parameter corresponding to <code>STREAM_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_TZNAME_MAX</code><a name="index-g_t_005fSC_005fTZNAME_005fMAX-3529"></a><dd>Inquire about the parameter corresponding to <code>TZNAME_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_NGROUPS_MAX</code><a name="index-g_t_005fSC_005fNGROUPS_005fMAX-3530"></a><dd>Inquire about the parameter corresponding to <code>NGROUPS_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_JOB_CONTROL</code><a name="index-g_t_005fSC_005fJOB_005fCONTROL-3531"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_JOB_CONTROL</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_SAVED_IDS</code><a name="index-g_t_005fSC_005fSAVED_005fIDS-3532"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_SAVED_IDS</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_VERSION</code><a name="index-g_t_005fSC_005fVERSION-3533"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_VERSION</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_CLK_TCK</code><a name="index-g_t_005fSC_005fCLK_005fTCK-3534"></a><dd>Inquire about the parameter corresponding to <code>CLOCKS_PER_SEC</code>;
see <a href="CPU-Time.html#CPU-Time">CPU Time</a>.
<!-- unistd.h -->
<!-- GNU -->
<br><dt><code>_SC_CHARCLASS_NAME_MAX</code><a name="index-g_t_005fSC_005fCHARCLASS_005fNAME_005fMAX-3535"></a><dd>Inquire about the parameter corresponding to maximal length allowed for
a character class name in an extended locale specification. These
extensions are not yet standardized and so this option is not standardized
as well.
<!-- unistdh.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_REALTIME_SIGNALS</code><a name="index-g_t_005fSC_005fREALTIME_005fSIGNALS-3536"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_REALTIME_SIGNALS</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_PRIORITY_SCHEDULING</code><a name="index-g_t_005fSC_005fPRIORITY_005fSCHEDULING-3537"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PRIORITY_SCHEDULING</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_TIMERS</code><a name="index-g_t_005fSC_005fTIMERS-3538"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_TIMERS</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_ASYNCHRONOUS_IO</code><a name="index-g_t_005fSC_005fASYNCHRONOUS_005fIO-3539"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_ASYNCHRONOUS_IO</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_PRIORITIZED_IO</code><a name="index-g_t_005fSC_005fPRIORITIZED_005fIO-3540"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PRIORITIZED_IO</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_SYNCHRONIZED_IO</code><a name="index-g_t_005fSC_005fSYNCHRONIZED_005fIO-3541"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_SYNCHRONIZED_IO</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_FSYNC</code><a name="index-g_t_005fSC_005fFSYNC-3542"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_FSYNC</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_MAPPED_FILES</code><a name="index-g_t_005fSC_005fMAPPED_005fFILES-3543"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_MAPPED_FILES</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_MEMLOCK</code><a name="index-g_t_005fSC_005fMEMLOCK-3544"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_MEMLOCK</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_MEMLOCK_RANGE</code><a name="index-g_t_005fSC_005fMEMLOCK_005fRANGE-3545"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_MEMLOCK_RANGE</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_MEMORY_PROTECTION</code><a name="index-g_t_005fSC_005fMEMORY_005fPROTECTION-3546"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_MEMORY_PROTECTION</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_MESSAGE_PASSING</code><a name="index-g_t_005fSC_005fMESSAGE_005fPASSING-3547"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_MESSAGE_PASSING</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_SEMAPHORES</code><a name="index-g_t_005fSC_005fSEMAPHORES-3548"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_SEMAPHORES</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_SHARED_MEMORY_OBJECTS</code><a name="index-g_t_005fSC_005fSHARED_005fMEMORY_005fOBJECTS-3549"></a><dd>Inquire about the parameter corresponding to<br>
<code>_POSIX_SHARED_MEMORY_OBJECTS</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_AIO_LISTIO_MAX</code><a name="index-g_t_005fSC_005fAIO_005fLISTIO_005fMAX-3550"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_AIO_LISTIO_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_AIO_MAX</code><a name="index-g_t_005fSC_005fAIO_005fMAX-3551"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_AIO_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_AIO_PRIO_DELTA_MAX</code><a name="index-g_t_005fSC_005fAIO_005fPRIO_005fDELTA_005fMAX-3552"></a><dd>Inquire the value by which a process can decrease its asynchronous I/O
priority level from its own scheduling priority. This corresponds to the
run-time invariant value <code>AIO_PRIO_DELTA_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_DELAYTIMER_MAX</code><a name="index-g_t_005fSC_005fDELAYTIMER_005fMAX-3553"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_DELAYTIMER_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_MQ_OPEN_MAX</code><a name="index-g_t_005fSC_005fMQ_005fOPEN_005fMAX-3554"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_MQ_OPEN_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_MQ_PRIO_MAX</code><a name="index-g_t_005fSC_005fMQ_005fPRIO_005fMAX-3555"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_MQ_PRIO_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_RTSIG_MAX</code><a name="index-g_t_005fSC_005fRTSIG_005fMAX-3556"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_RTSIG_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_SEM_NSEMS_MAX</code><a name="index-g_t_005fSC_005fSEM_005fNSEMS_005fMAX-3557"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_SEM_NSEMS_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_SEM_VALUE_MAX</code><a name="index-g_t_005fSC_005fSEM_005fVALUE_005fMAX-3558"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_SEM_VALUE_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_SIGQUEUE_MAX</code><a name="index-g_t_005fSC_005fSIGQUEUE_005fMAX-3559"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_SIGQUEUE_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_TIMER_MAX</code><a name="index-g_t_005fSC_005fTIMER_005fMAX-3560"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_TIMER_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII</code><a name="index-g_t_005fSC_005fPII-3561"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII_XTI</code><a name="index-g_t_005fSC_005fPII_005fXTI-3562"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII_XTI</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII_SOCKET</code><a name="index-g_t_005fSC_005fPII_005fSOCKET-3563"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII_SOCKET</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII_INTERNET</code><a name="index-g_t_005fSC_005fPII_005fINTERNET-3564"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII_INTERNET</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII_OSI</code><a name="index-g_t_005fSC_005fPII_005fOSI-3565"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII_OSI</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_SELECT</code><a name="index-g_t_005fSC_005fSELECT-3566"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_SELECT</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_UIO_MAXIOV</code><a name="index-g_t_005fSC_005fUIO_005fMAXIOV-3567"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_UIO_MAXIOV</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII_INTERNET_STREAM</code><a name="index-g_t_005fSC_005fPII_005fINTERNET_005fSTREAM-3568"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII_INTERNET_STREAM</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII_INTERNET_DGRAM</code><a name="index-g_t_005fSC_005fPII_005fINTERNET_005fDGRAM-3569"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII_INTERNET_DGRAM</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII_OSI_COTS</code><a name="index-g_t_005fSC_005fPII_005fOSI_005fCOTS-3570"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII_OSI_COTS</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII_OSI_CLTS</code><a name="index-g_t_005fSC_005fPII_005fOSI_005fCLTS-3571"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII_OSI_CLTS</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_PII_OSI_M</code><a name="index-g_t_005fSC_005fPII_005fOSI_005fM-3572"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_PII_OSI_M</code>.
<!-- unistd.h -->
<!-- POSIX.1g -->
<br><dt><code>_SC_T_IOV_MAX</code><a name="index-g_t_005fSC_005fT_005fIOV_005fMAX-3573"></a><dd>Inquire the value of the value associated with the <code>T_IOV_MAX</code>
variable.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREADS</code><a name="index-g_t_005fSC_005fTHREADS-3574"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_THREADS</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_SAFE_FUNCTIONS</code><a name="index-g_t_005fSC_005fTHREAD_005fSAFE_005fFUNCTIONS-3575"></a><dd>Inquire about the parameter corresponding to<br>
<code>_POSIX_THREAD_SAFE_FUNCTIONS</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_GETGR_R_SIZE_MAX</code><a name="index-g_t_005fSC_005fGETGR_005fR_005fSIZE_005fMAX-3576"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_GETGR_R_SIZE_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_GETPW_R_SIZE_MAX</code><a name="index-g_t_005fSC_005fGETPW_005fR_005fSIZE_005fMAX-3577"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_GETPW_R_SIZE_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_LOGIN_NAME_MAX</code><a name="index-g_t_005fSC_005fLOGIN_005fNAME_005fMAX-3578"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_LOGIN_NAME_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_TTY_NAME_MAX</code><a name="index-g_t_005fSC_005fTTY_005fNAME_005fMAX-3579"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_TTY_NAME_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_DESTRUCTOR_ITERATIONS</code><a name="index-g_t_005fSC_005fTHREAD_005fDESTRUCTOR_005fITERATIONS-3580"></a><dd>Inquire about the parameter corresponding to
<code>_POSIX_THREAD_DESTRUCTOR_ITERATIONS</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_KEYS_MAX</code><a name="index-g_t_005fSC_005fTHREAD_005fKEYS_005fMAX-3581"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_THREAD_KEYS_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_STACK_MIN</code><a name="index-g_t_005fSC_005fTHREAD_005fSTACK_005fMIN-3582"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_THREAD_STACK_MIN</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_THREADS_MAX</code><a name="index-g_t_005fSC_005fTHREAD_005fTHREADS_005fMAX-3583"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_THREAD_THREADS_MAX</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_ATTR_STACKADDR</code><a name="index-g_t_005fSC_005fTHREAD_005fATTR_005fSTACKADDR-3584"></a><dd>Inquire about the parameter corresponding to<br>a
<code>_POSIX_THREAD_ATTR_STACKADDR</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_ATTR_STACKSIZE</code><a name="index-g_t_005fSC_005fTHREAD_005fATTR_005fSTACKSIZE-3585"></a><dd>Inquire about the parameter corresponding to<br>
<code>_POSIX_THREAD_ATTR_STACKSIZE</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_PRIORITY_SCHEDULING</code><a name="index-g_t_005fSC_005fTHREAD_005fPRIORITY_005fSCHEDULING-3586"></a><dd>Inquire about the parameter corresponding to
<code>_POSIX_THREAD_PRIORITY_SCHEDULING</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_PRIO_INHERIT</code><a name="index-g_t_005fSC_005fTHREAD_005fPRIO_005fINHERIT-3587"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_THREAD_PRIO_INHERIT</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_PRIO_PROTECT</code><a name="index-g_t_005fSC_005fTHREAD_005fPRIO_005fPROTECT-3588"></a><dd>Inquire about the parameter corresponding to <code>_POSIX_THREAD_PRIO_PROTECT</code>.
<!-- unistd.h -->
<!-- POSIX.1 -->
<br><dt><code>_SC_THREAD_PROCESS_SHARED</code><a name="index-g_t_005fSC_005fTHREAD_005fPROCESS_005fSHARED-3589"></a><dd>Inquire about the parameter corresponding to
<code>_POSIX_THREAD_PROCESS_SHARED</code>.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_2_C_DEV</code><a name="index-g_t_005fSC_005f2_005fC_005fDEV-3590"></a><dd>Inquire about whether the system has the POSIX.2 C compiler command,
<code>c89</code>.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_2_FORT_DEV</code><a name="index-g_t_005fSC_005f2_005fFORT_005fDEV-3591"></a><dd>Inquire about whether the system has the POSIX.2 Fortran compiler
command, <code>fort77</code>.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_2_FORT_RUN</code><a name="index-g_t_005fSC_005f2_005fFORT_005fRUN-3592"></a><dd>Inquire about whether the system has the POSIX.2 <code>asa</code> command to
interpret Fortran carriage control.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_2_LOCALEDEF</code><a name="index-g_t_005fSC_005f2_005fLOCALEDEF-3593"></a><dd>Inquire about whether the system has the POSIX.2 <code>localedef</code>
command.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_2_SW_DEV</code><a name="index-g_t_005fSC_005f2_005fSW_005fDEV-3594"></a><dd>Inquire about whether the system has the POSIX.2 commands <code>ar</code>,
<code>make</code>, and <code>strip</code>.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_BC_BASE_MAX</code><a name="index-g_t_005fSC_005fBC_005fBASE_005fMAX-3595"></a><dd>Inquire about the maximum value of <code>obase</code> in the <code>bc</code>
utility.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_BC_DIM_MAX</code><a name="index-g_t_005fSC_005fBC_005fDIM_005fMAX-3596"></a><dd>Inquire about the maximum size of an array in the <code>bc</code>
utility.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_BC_SCALE_MAX</code><a name="index-g_t_005fSC_005fBC_005fSCALE_005fMAX-3597"></a><dd>Inquire about the maximum value of <code>scale</code> in the <code>bc</code>
utility.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_BC_STRING_MAX</code><a name="index-g_t_005fSC_005fBC_005fSTRING_005fMAX-3598"></a><dd>Inquire about the maximum size of a string constant in the
<code>bc</code> utility.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_COLL_WEIGHTS_MAX</code><a name="index-g_t_005fSC_005fCOLL_005fWEIGHTS_005fMAX-3599"></a><dd>Inquire about the maximum number of weights that can necessarily
be used in defining the collating sequence for a locale.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_EXPR_NEST_MAX</code><a name="index-g_t_005fSC_005fEXPR_005fNEST_005fMAX-3600"></a><dd>Inquire about the maximum number of expressions nested within
parentheses when using the <code>expr</code> utility.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_LINE_MAX</code><a name="index-g_t_005fSC_005fLINE_005fMAX-3601"></a><dd>Inquire about the maximum size of a text line that the POSIX.2 text
utilities can handle.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_EQUIV_CLASS_MAX</code><a name="index-g_t_005fSC_005fEQUIV_005fCLASS_005fMAX-3602"></a><dd>Inquire about the maximum number of weights that can be assigned to an
entry of the <code>LC_COLLATE</code> category &lsquo;<samp><span class="samp">order</span></samp>&rsquo; keyword in a locale
definition. The GNU C library does not presently support locale
definitions.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_VERSION</code><a name="index-g_t_005fSC_005fVERSION-3603"></a><dd>Inquire about the version number of POSIX.1 that the library and kernel
support.
<!-- unistd.h -->
<!-- POSIX.2 -->
<br><dt><code>_SC_2_VERSION</code><a name="index-g_t_005fSC_005f2_005fVERSION-3604"></a><dd>Inquire about the version number of POSIX.2 that the system utilities
support.
<!-- unistd.h -->
<!-- GNU -->
<br><dt><code>_SC_PAGESIZE</code><a name="index-g_t_005fSC_005fPAGESIZE-3605"></a><dd>Inquire about the virtual memory page size of the machine.
<code>getpagesize</code> returns the same value (see <a href="Query-Memory-Parameters.html#Query-Memory-Parameters">Query Memory Parameters</a>).
<!-- unistd.h -->
<!-- GNU -->
<br><dt><code>_SC_NPROCESSORS_CONF</code><a name="index-g_t_005fSC_005fNPROCESSORS_005fCONF-3606"></a><dd>Inquire about the number of configured processors.
<!-- unistd.h -->
<!-- GNU -->
<br><dt><code>_SC_NPROCESSORS_ONLN</code><a name="index-g_t_005fSC_005fNPROCESSORS_005fONLN-3607"></a><dd>Inquire about the number of processors online.
<!-- unistd.h -->
<!-- GNU -->
<br><dt><code>_SC_PHYS_PAGES</code><a name="index-g_t_005fSC_005fPHYS_005fPAGES-3608"></a><dd>Inquire about the number of physical pages in the system.
<!-- unistd.h -->
<!-- GNU -->
<br><dt><code>_SC_AVPHYS_PAGES</code><a name="index-g_t_005fSC_005fAVPHYS_005fPAGES-3609"></a><dd>Inquire about the number of available physical pages in the system.
<!-- unistd.h -->
<!-- GNU -->
<br><dt><code>_SC_ATEXIT_MAX</code><a name="index-g_t_005fSC_005fATEXIT_005fMAX-3610"></a><dd>Inquire about the number of functions which can be registered as termination
functions for <code>atexit</code>; see <a href="Cleanups-on-Exit.html#Cleanups-on-Exit">Cleanups on Exit</a>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_VERSION</code><a name="index-g_t_005fSC_005fXOPEN_005fVERSION-3611"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_VERSION</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_XCU_VERSION</code><a name="index-g_t_005fSC_005fXOPEN_005fXCU_005fVERSION-3612"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_XCU_VERSION</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_UNIX</code><a name="index-g_t_005fSC_005fXOPEN_005fUNIX-3613"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_UNIX</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_REALTIME</code><a name="index-g_t_005fSC_005fXOPEN_005fREALTIME-3614"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_REALTIME</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_REALTIME_THREADS</code><a name="index-g_t_005fSC_005fXOPEN_005fREALTIME_005fTHREADS-3615"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_REALTIME_THREADS</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_LEGACY</code><a name="index-g_t_005fSC_005fXOPEN_005fLEGACY-3616"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_LEGACY</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_CRYPT</code><a name="index-g_t_005fSC_005fXOPEN_005fCRYPT-3617"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_CRYPT</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_ENH_I18N</code><a name="index-g_t_005fSC_005fXOPEN_005fENH_005fI18N-3618"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_ENH_I18N</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_SHM</code><a name="index-g_t_005fSC_005fXOPEN_005fSHM-3619"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_SHM</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_XPG2</code><a name="index-g_t_005fSC_005fXOPEN_005fXPG2-3620"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_XPG2</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_XPG3</code><a name="index-g_t_005fSC_005fXOPEN_005fXPG3-3621"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_XPG3</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_XOPEN_XPG4</code><a name="index-g_t_005fSC_005fXOPEN_005fXPG4-3622"></a><dd>Inquire about the parameter corresponding to <code>_XOPEN_XPG4</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_CHAR_BIT</code><a name="index-g_t_005fSC_005fCHAR_005fBIT-3623"></a><dd>Inquire about the number of bits in a variable of type <code>char</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_CHAR_MAX</code><a name="index-g_t_005fSC_005fCHAR_005fMAX-3624"></a><dd>Inquire about the maximum value which can be stored in a variable of type
<code>char</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_CHAR_MIN</code><a name="index-g_t_005fSC_005fCHAR_005fMIN-3625"></a><dd>Inquire about the minimum value which can be stored in a variable of type
<code>char</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_INT_MAX</code><a name="index-g_t_005fSC_005fINT_005fMAX-3626"></a><dd>Inquire about the maximum value which can be stored in a variable of type
<code>int</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_INT_MIN</code><a name="index-g_t_005fSC_005fINT_005fMIN-3627"></a><dd>Inquire about the minimum value which can be stored in a variable of type
<code>int</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_LONG_BIT</code><a name="index-g_t_005fSC_005fLONG_005fBIT-3628"></a><dd>Inquire about the number of bits in a variable of type <code>long int</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_WORD_BIT</code><a name="index-g_t_005fSC_005fWORD_005fBIT-3629"></a><dd>Inquire about the number of bits in a variable of a register word.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_MB_LEN_MAX</code><a name="index-g_t_005fSC_005fMB_005fLEN_005fMAX-3630"></a><dd>Inquire the maximum length of a multi-byte representation of a wide
character value.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_NZERO</code><a name="index-g_t_005fSC_005fNZERO-3631"></a><dd>Inquire about the value used to internally represent the zero priority level for
the process execution.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>SC_SSIZE_MAX</code><a name="index-SC_005fSSIZE_005fMAX-3632"></a><dd>Inquire about the maximum value which can be stored in a variable of type
<code>ssize_t</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_SCHAR_MAX</code><a name="index-g_t_005fSC_005fSCHAR_005fMAX-3633"></a><dd>Inquire about the maximum value which can be stored in a variable of type
<code>signed char</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_SCHAR_MIN</code><a name="index-g_t_005fSC_005fSCHAR_005fMIN-3634"></a><dd>Inquire about the minimum value which can be stored in a variable of type
<code>signed char</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_SHRT_MAX</code><a name="index-g_t_005fSC_005fSHRT_005fMAX-3635"></a><dd>Inquire about the maximum value which can be stored in a variable of type
<code>short int</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_SHRT_MIN</code><a name="index-g_t_005fSC_005fSHRT_005fMIN-3636"></a><dd>Inquire about the minimum value which can be stored in a variable of type
<code>short int</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_UCHAR_MAX</code><a name="index-g_t_005fSC_005fUCHAR_005fMAX-3637"></a><dd>Inquire about the maximum value which can be stored in a variable of type
<code>unsigned char</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_UINT_MAX</code><a name="index-g_t_005fSC_005fUINT_005fMAX-3638"></a><dd>Inquire about the maximum value which can be stored in a variable of type
<code>unsigned int</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_ULONG_MAX</code><a name="index-g_t_005fSC_005fULONG_005fMAX-3639"></a><dd>Inquire about the maximum value which can be stored in a variable of type
<code>unsigned long int</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_USHRT_MAX</code><a name="index-g_t_005fSC_005fUSHRT_005fMAX-3640"></a><dd>Inquire about the maximum value which can be stored in a variable of type
<code>unsigned short int</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_NL_ARGMAX</code><a name="index-g_t_005fSC_005fNL_005fARGMAX-3641"></a><dd>Inquire about the parameter corresponding to <code>NL_ARGMAX</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_NL_LANGMAX</code><a name="index-g_t_005fSC_005fNL_005fLANGMAX-3642"></a><dd>Inquire about the parameter corresponding to <code>NL_LANGMAX</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_NL_MSGMAX</code><a name="index-g_t_005fSC_005fNL_005fMSGMAX-3643"></a><dd>Inquire about the parameter corresponding to <code>NL_MSGMAX</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_NL_NMAX</code><a name="index-g_t_005fSC_005fNL_005fNMAX-3644"></a><dd>Inquire about the parameter corresponding to <code>NL_NMAX</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_NL_SETMAX</code><a name="index-g_t_005fSC_005fNL_005fSETMAX-3645"></a><dd>Inquire about the parameter corresponding to <code>NL_SETMAX</code>.
<!-- unistd.h -->
<!-- X/Open -->
<br><dt><code>_SC_NL_TEXTMAX</code><a name="index-g_t_005fSC_005fNL_005fTEXTMAX-3646"></a><dd>Inquire about the parameter corresponding to <code>NL_TEXTMAX</code>.
</dl>
</body></html>