search.h - Man Page

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

#include <search.h>

The <search.h> header shall define the ENTRY type for structure entry which shall include the following members:

char    *key
void    *data

and shall define ACTION and VISIT as enumeration data types through type definitions as follows:

enum { FIND, ENTER } ACTION;
enum { preorder, postorder, endorder, leaf } VISIT;

The <search.h> header shall define the size_t type as described in <sys/types.h>.

The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

int    hcreate(size_t);
void   hdestroy(void);
ENTRY *hsearch(ENTRY, ACTION);
void   insque(void *, void *);
void  *lfind(const void *, const void *, size_t *,
          size_t, int (*)(const void *, const void *));
void  *lsearch(const void *, void *, size_t *,
          size_t, int (*)(const void *, const void *));
void   remque(void *);
void  *tdelete(const void *restrict, void **restrict,
          int(*)(const void *, const void *));
void  *tfind(const void *, void *const *,
          int(*)(const void *, const void *));
void  *tsearch(const void *, void **,
          int(*)(const void *, const void *));
void   twalk(const void *,
          void (*)(const void *, VISIT, int ));

The following sections are informative.

None.

None.

None.

<sys_types.h>

The System Interfaces volume of POSIX.1-2017, hcreate(), insque(), lsearch(), tdelete()

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

hcreate(3p), insque(3p), lsearch(3p), tdelete(3p).