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authorTobias Klauser <tklauser@distanz.ch>2008-01-27 11:37:44 +0100
committerTobias Klauser <tklauser@xenon.tklauser.home>2008-01-27 11:37:44 +0100
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+<TITLE>sysconf</TITLE>
+<body bgcolor="#ffffcc">
+<hr>
+<pre>
+
+
+
+<h3>SYSCONF(3) Linux Programmer's Manual SYSCONF(3)
+</h3>
+
+<h3>NAME
+</h3> sysconf - Get configuration information at runtime
+
+<h3>SYNOPSIS
+</h3> #include &lt;unistd.h&gt;
+
+ long sysconf(int name);
+
+<h3>DESCRIPTION
+</h3> sysconf() provides a way for the application to determine
+ values for system limits or options at runtime.
+
+ The equivalent macros defined in &lt;unistd.h&gt; can only give
+ conservative values; if an application wants to take
+ advantage of values which may change, a call to sysconf()
+ can be made, which may yield more liberal results.
+
+ For getting information about a particular file, see
+ fpathconf() or pathconf().
+
+ The following values are supported for name. First, the
+ POSIX.1 compatible values:
+
+ _SC_ARG_MAX
+ The maximum length of the arguments to the exec()
+ family of functions; the corresponding macro is
+ ARG_MAX.
+
+ _SC_CHILD_MAX
+ The number of simultaneous processes per user id,
+ the corresponding macro is _POSIX_CHILD_MAX.
+
+ _SC_CLK_TCK
+ The number of clock ticks per second; the corre-
+ sponding macro is CLK_TCK.
+
+ _SC_STREAM_MAX
+ The maximum number of streams that a process can
+ have open at any time. The corresponding POSIX
+ macro is STREAM_MAX, the corresponding standard C
+ macro is FOPEN_MAX.
+
+ _SC_TZNAME_MAX
+ The maximum number of bytes in a timezone name, the
+ corresponding macro is TZNAME_MAX.
+
+ _SC_OPEN_MAX
+ The maximum number of files that a process can have
+ open at any time, the corresponding macro is
+ _POSIX_OPEN_MAX.
+
+ _SC_JOB_CONTROL
+ This indicates whether POSIX - style job control is
+ supported, the corresponding macro is
+
+
+
+<h3>GNU April 18, 1993 1
+</h3>
+
+
+
+
+<h3>SYSCONF(3) Linux Programmer's Manual SYSCONF(3)
+</h3>
+
+ _POSIX_JOB_CONTROL.
+
+ _SC_SAVED_IDS
+ This indicates whether a process has a saved set-
+ user-ID and a saved set-group-ID; the corresponding
+ macro is _POSIX_SAVED_IDS.
+
+ _SC_VERSION
+ indicates the year and month the POSIX.1 standard
+ was approved in the format YYYYMML;the value
+ 199009L indicates the most recent revision, 1990.
+
+ Next, the POSIX.2 values:
+
+ _SC_BC_BASE_MAX
+ indicates the maximum obase value accepted by the
+ bc(1) utility; the corresponding macro is
+ BC_BASE_MAX.
+
+ _SC_BC_DIM_MAX
+ indicates the maximum value of elements permitted
+ in an array by bc(1); the corresponding macro is
+ BC_DIM_MAX.
+
+ _SC_BC_SCALE_MAX
+ indicates the maximum scale value allowed by bc(1);
+ the corresponding macro is BC_SCALE_MAX.
+
+ _SC_BC_STRING_MAX
+ indicates the maximum length of a string accepted
+ by bc(1); the corresponding macro is BC_STRING_MAX.
+
+ _SC_COLL_WEIGHTS_MAX
+ indicates the maximum numbers of weights that can
+ be assigned to an entry of the LC_COLLATE order
+ keyword in the locale definition file; the corre-
+ sponding macro is COLL_WEIGHTS_MAX.
+
+ _SC_EXPR_NEST_MAX
+ is the maximum number of expressions which can be
+ nested within parentheses by expr(1). The corre-
+ sponding macro is EXPR_NEST_MAX.
+
+ _SC_LINE_MAX
+ The maximum length of a utility's input line
+ length, either from standard input or from a file.
+ This includes length for a trailing newline. The
+ corresponding macro is LINE_MAX.
+
+ _SC_RE_DUP_MAX
+ The maximum number of repeated occurrences of a
+ regular expression when the interval notation
+ \{m,n\} is used. The value of the corresponding
+ macro is RE_DUP_MAX.
+
+
+
+<h3>GNU April 18, 1993 2
+</h3>
+
+
+
+
+<h3>SYSCONF(3) Linux Programmer's Manual SYSCONF(3)
+</h3>
+
+ _SC_2_VERSION
+ indicates the version of the POSIX.2 standard in
+ the format of YYYYMML. The corresponding macro is
+ POSIX2_VERSION.
+
+ _SC_2_DEV
+ indicates whether the POSIX.2 C language develop-
+ ment facilities are supported. The corresponding
+ macro is POSIX2_C_DEV.
+
+ _SC_2_FORT_DEV
+ indicates whether the POSIX.2 FORTRAN development
+ utilities are supported. The corresponding macro
+ is POSIX2_FORT_RUN.
+
+ _SC_2_FORT_RUN
+ indicates whether the POSIX.2 FORTRAN runtime util-
+ ities are supported. The corresponding macro is
+ POSIX2_FORT_RUN.
+
+ POSIX2_LOCALEDEF
+ indicates whether the POSIX.2 creation of locates
+ via locale(1) is supported. The corresponding
+ macro is POSIX2_LOCALEDEF.
+
+ _SC_2_SW_DEV
+ indicates whether the POSIX.2 software development
+ utilities option is supported. The corresponding
+ macro is POSIX2_SW_DEV.
+
+<h3>RETURN VALUE
+</h3> The value returned is the value of the system resource, 1
+ if a queried option is available, 0 if it is not, or -1 on
+ error. The variable errno is not set.
+
+<h3>CONFORMS TO
+</h3> POSIX.1, proposed POSIX.2
+
+<h3>BUGS
+</h3> It is difficult use ARG_MAX because it is not specified
+ how much of the argument space for exec() is consumed by
+ the user's environment variables.
+
+ Some returned values may be huge; they are not suitable
+ for allocating memory.
+
+ POSIX.2 is not yet an approved standard; the information
+ in this manpage is subject to change.
+
+</pre>
+<hr>
+<h3>SEE ALSO
+</h3><p>
+<a href=bc.htm>bc</a>,
+<a href=expr.htm>expr</a>,
+<a href=locale.htm>locale</a>,
+<a href=fpathconf.htm>fpathconf</a>,
+<a href=pathconf.htm>pathconf</a>,
+<pre>
+
+
+
+
+
+
+<h3>GNU April 18, 1993 3
+</h3>
+
+ </pre>
+<P>
+<hr>
+<p>
+<center>
+<table border=2 width=80%>
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+
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