getw(3)

getw3

Input and output of words (ints)

Usage

#include <stdio.h>

int getw(FILE *stream); int putw(int w, FILE *stream);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

getw(), putw():

    Since glibc 2.3.3:
        _XOPEN_SOURCE && ! (_POSIX_C_SOURCE >= 200112L)
            || /* glibc >= 2.19: */ _DEFAULT_SOURCE
            || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
    Before glibc 2.3.3:
        _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE

Library

Standard C library (libc, -lc)

Overview

getw() reads a word (that is, an int) from stream. It's provided for compatibility with SVr4. We recommend you use fread(3) instead.

putw() writes the word w (that is, an int) to stream. It is provided for compatibility with SVr4, but we recommend you use fwrite(3) instead.

Return value

Normally, getw() returns the word read, and putw() returns 0. On error, they return EOF.

Attributes

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue
getw(), putw()Thread safetyMT-Safe

Releases

19 releases since Debian 1.1 (Buzz); the text changed 13 times.

  1. 1.1–2.2
  2. 3.0
  3. 3.1
  4. 4.0
  5. 5.0
  6. 6.0
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. Arch

Standards

None.

History

SVr4, SUSv2.

Bugs

The value returned on error is also a legitimate data value. ferror(3) can be used to distinguish between the two cases.

From man-pages 6.19-1 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.