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intptr_t(3type) — Linux manual page

intptr_t(3type)intptr_t(3type)

NAME        top

       intptr_t, uintptr_t - integer types wide enough to hold pointers

LIBRARY        top

       Standard C library (libc)

SYNOPSIS        top

#include <stdint.h>typedef/* ... */intptr_t;typedef/* ... */uintptr_t;#define INTPTR_WIDTH/* ... */#define UINTPTR_WIDTH INTPTR_WIDTH#define INTPTR_MAX/*  2**(INTPTR_WIDTH - 1) - 1  */#define INTPTR_MIN/*  - 2**(INTPTR_WIDTH - 1)    */#define UINTPTR_MAX/*  2**UINTPTR_WIDTH - 1       */

DESCRIPTION        top

intptr_t is a signed integer type such that any valid (void *)       value can be converted to this type and then converted back.  It       is capable of storing values in the range [INTPTR_MIN,INTPTR_MAX].uintptr_t is an unsigned integer type such that any valid (void *)       value can be converted to this type and then converted back.  It       is capable of storing values in the range [0,UINTPTR_MAX].       The macros [U]INTPTR_WIDTHexpand to the width in bits of these       types.       The macros [U]INTPTR_MAXexpand to the maximum value that these       types can hold.       The macroINTPTR_MINexpands to the minimum value thatintptr_t       can hold.       The length modifiers for the [u]intptr_t types for theprintf(3)       family of functions are expanded by the macrosPRIdPTR,PRIiPTR,       andPRIuPTR(defined in<inttypes.h>); resulting commonly in%"PRIdPTR"or%"PRIiPTR"for printingintptr_t values.  The length       modifiers for the[u]intptr_t types for thescanf(3) family of       functions are expanded by the macrosSCNdPTR,SCNiPTR, andSCNuPTR       (defined in<inttypes.h>); resulting commonly in%"SCNuPTR"for       scanninguintptr_t values.

STANDARDS        top

       C11, POSIX.1-2008.

HISTORY        top

       C99, POSIX.1-2001.

NOTES        top

       The following header also provides these types:<inttypes.h>.

SEE ALSO        top

intmax_t(3type),void(3)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17intptr_t(3type)

Pages that refer to this page:intmax_t(3type), intN_t(3type), void(3type)

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