stdlib.h.html

IEEE 1003.1-2003, Single Unix Specification v3

void          qsort(void *, size_t, size_t, int (*)(const void *,
                  const void *));
int           rand(void);
<sup>[<a href="javascript:open_code('TSF')">TSF</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
int           rand_r(unsigned *);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
long          random(void);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
void         *realloc(void *, size_t);
<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
char         *realpath(const char *restrict, char *restrict);
unsigned short seed48(unsigned short[3]);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
<sup>[<a href="javascript:open_code('CX')">CX</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
int           setenv(const char *, const char *, int);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
void          setkey(const char *);
char         *setstate(const char *);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
void          srand(unsigned);
<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
void          srand48(long);
void          srandom(unsigned);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
double        strtod(const char *restrict, char **restrict);
float         strtof(const char *restrict, char **restrict);
long          strtol(const char *restrict, char **restrict, int);
long double   strtold(const char *restrict, char **restrict);
long long     strtoll(const char *restrict, char **restrict, int);
unsigned long strtoul(const char *restrict, char **restrict, int);
unsigned long long
              strtoull(const char *restrict, char **restrict, int);
int           system(const char *);
<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
int           unlockpt(int);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
<sup>[<a href="javascript:open_code('CX')">CX</a>]</sup><img src="../images/opt-start.gif" alt="[Option Start]" border="0">
int           unsetenv(const char *);
<img src="../images/opt-end.gif" alt="[Option End]" border="0">
size_t        wcstombs(char *restrict, const wchar_t *restrict, size_t);
int           wctomb(char *, wchar_t);
</tt>
</pre>

<p><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
Inclusion of the <i>&lt;stdlib.h&gt;</i> header may also make visible all symbols from <a href=
"../basedefs/stddef.h.html"><i>&lt;stddef.h&gt;</i></a>, <a href="../basedefs/limits.h.html"><i>&lt;limits.h&gt;</i></a>, <a href=
"../basedefs/math.h.html"><i>&lt;math.h&gt;</i></a>, and <a href="../basedefs/sys/wait.h.html"><i>&lt;sys/wait.h&gt;</i></a>. <img
src="../images/opt-end.gif" alt="[Option End]" border="0"></p>
</blockquote>

<hr>
<div class="box"><em>The following sections are informative.</em></div>

<h4><a name="tag_13_50_04"></a>APPLICATION USAGE</h4>

<blockquote>
<p>None.</p>
</blockquote>

<h4><a name="tag_13_50_05"></a>RATIONALE</h4>

<blockquote>
<p>None.</p>
</blockquote>

<h4><a name="tag_13_50_06"></a>FUTURE DIRECTIONS</h4>

<blockquote>
<p>None.</p>
</blockquote>

<h4><a name="tag_13_50_07"></a>SEE ALSO</h4>

<blockquote>
<p><a href="limits.h.html"><i>&lt;limits.h&gt;</i></a> , <a href="math.h.html"><i>&lt;math.h&gt;</i></a> , <a href=
"stddef.h.html"><i>&lt;stddef.h&gt;</i></a> , <a href="sys/types.h.html"><i>&lt;sys/types.h&gt;</i></a> , <a href=
"sys/wait.h.html"><i>&lt;sys/wait.h&gt;</i></a> , the System Interfaces volume of IEEE&nbsp;Std&nbsp;1003.1-2001, <a href=
"../functions/_Exit.html"><i>_Exit</i>()</a>, <a href="../functions/a64l.html"><i>a64l</i>()</a>, <a href=
"../functions/abort.html"><i>abort</i>()</a>, <a href="../functions/abs.html"><i>abs</i>()</a>, <a href=
"../functions/atexit.html"><i>atexit</i>()</a>, <a href="../functions/atof.html"><i>atof</i>()</a>, <a href=
"../functions/atoi.html"><i>atoi</i>()</a>, <a href="../functions/atol.html"><i>atol</i>()</a>, <a href=
"../functions/atoll.html"><i>atoll</i>()</a>, <a href="../functions/bsearch.html"><i>bsearch</i>()</a>, <a href=
"../functions/calloc.html"><i>calloc</i>()</a>, <a href="../functions/div.html"><i>div</i>()</a>, <a href=
"../functions/drand48.html"><i>drand48</i>()</a>, <a href="../functions/erand48.html"><i>erand48</i>()</a>, <a href=
"../functions/exit.html"><i>exit</i>()</a>, <a href="../functions/free.html"><i>free</i>()</a>, <a href=
"../functions/getenv.html"><i>getenv</i>()</a>, <a href="../functions/getsubopt.html"><i>getsubopt</i>()</a>, <a href=
"../functions/grantpt.html"><i>grantpt</i>()</a>, <a href="../functions/initstate.html"><i>initstate</i>()</a>, <a href=
"../functions/jrand48.html"><i>jrand48</i>()</a>, <a href="../functions/l64a.html"><i>l64a</i>()</a>, <a href=
"../functions/labs.html"><i>labs</i>()</a>, <a href="../functions/lcong48.html"><i>lcong48</i>()</a>, <a href=
"../functions/ldiv.html"><i>ldiv</i>()</a>, <a href="../functions/llabs.html"><i>llabs</i>()</a>, <a href=
"../functions/lldiv.html"><i>lldiv</i>()</a>, <a href="../functions/lrand48.html"><i>lrand48</i>()</a>, <a href=
"../functions/malloc.html"><i>malloc</i>()</a>, <a href="../functions/mblen.html"><i>mblen</i>()</a>, <a href=
"../functions/mbstowcs.html"><i>mbstowcs</i>()</a>, <a href="../functions/mbtowc.html"><i>mbtowc</i>()</a>, <a href=
"../functions/mkstemp.html"><i>mkstemp</i>()</a>, <a href="../functions/mrand48.html"><i>mrand48</i>()</a>, <a href=
"../functions/nrand48.html"><i>nrand48</i>()</a>, <a href="../functions/posix_memalign.html"><i>posix_memalign</i>()</a>, <a href=
"../functions/ptsname.html"><i>ptsname</i>()</a>, <a href="../functions/putenv.html"><i>putenv</i>()</a>, <a href=
"../functions/qsort.html"><i>qsort</i>()</a>, <a href="../functions/rand.html"><i>rand</i>()</a>, <a href=
"../functions/realloc.html"><i>realloc</i>()</a>, <a href="../functions/realpath.html"><i>realpath</i>()</a>, <a href=
"../functions/setstate.html"><i>setstate</i>()</a>, <a href="../functions/srand.html"><i>srand</i>()</a>, <a href=
"../functions/srand48.html"><i>srand48</i>()</a>, <a href="../functions/srandom.html"><i>srandom</i>()</a>, <a href=
"../functions/strtod.html"><i>strtod</i>()</a>, <a href="../functions/strtof.html"><i>strtof</i>()</a>, <a href=
"../functions/strtol.html"><i>strtol</i>()</a>, <a href="../functions/strtold.html"><i>strtold</i>()</a>, <a href=
"../functions/strtoll.html"><i>strtoll</i>()</a>, <a href="../functions/strtoul.html"><i>strtoul</i>()</a>, <a href=
"../functions/strtoull.html"><i>strtoull</i>()</a>, <a href="../functions/unlockpt.html"><i>unlockpt</i>()</a>, <a href=
"../functions/wcstombs.html"><i>wcstombs</i>()</a>, <a href="../functions/wctomb.html"><i>wctomb</i>()</a></p>
</blockquote>

<h4><a name="tag_13_50_08"></a>CHANGE HISTORY</h4>

<blockquote>
<p>First released in Issue 3.</p>
</blockquote>

<h4><a name="tag_13_50_09"></a>Issue 5</h4>

<blockquote>
<p>The DESCRIPTION is updated for alignment with the POSIX Threads Extension.</p>

<p>The <i>ttyslot</i>() and <i>valloc</i>() functions are marked LEGACY.</p>

<p>The type of the third argument to <a href="../functions/initstate.html"><i>initstate</i>()</a> is changed from <b>int</b> to
<b>size_t</b>. The type of the return value from <a href="../functions/setstate.html"><i>setstate</i>()</a> is changed from
<b>char</b> to <b>char *</b>, and the type of the first argument is changed from <b>char *</b> to <b>const char *</b>.</p>
</blockquote>

<h4><a name="tag_13_50_10"></a>Issue 6</h4>

<blockquote>
<p>The Open Group Corrigendum U021/1 is applied, correcting the prototype for <a href=
"../functions/realpath.html"><i>realpath</i>()</a> to be consistent with the reference page.</p>

<p>The Open Group Corrigendum U028/13 is applied, correcting the prototype for <a href=
"../functions/putenv.html"><i>putenv</i>()</a> to be consistent with the reference page.</p>

<p>The <a href="../functions/rand_r.html"><i>rand_r</i>()</a> function is marked as part of the Thread-Safe Functions option.</p>

<p>Function prototypes for <a href="../functions/setenv.html"><i>setenv</i>()</a> and <a href=
"../functions/unsetenv.html"><i>unsetenv</i>()</a> are added.</p>

<p>The <a href="../functions/posix_memalign.html"><i>posix_memalign</i>()</a> function is added for alignment with
IEEE&nbsp;Std&nbsp;1003.1d-1999.</p>

<p>This reference page is updated to align with the ISO/IEC&nbsp;9899:1999 standard.</p>

<p>The <a href="../functions/ecvt.html"><i>ecvt</i>()</a>, <a href="../functions/fcvt.html"><i>fcvt</i>()</a>, <a href=
"../functions/gcvt.html"><i>gcvt</i>()</a>, and <a href="../functions/mktemp.html"><i>mktemp</i>()</a> functions are marked
LEGACY.</p>

<p>The <i>ttyslot</i>() and <i>valloc</i>() functions are removed as they were previously marked LEGACY.</p>

<p>Extensions beyond the ISO&nbsp;C standard are marked.</p>
</blockquote>

<div class="box"><em>End of informative text.</em></div>

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