Section : 3 Updated : 2023-02-05 Source : Linux man-pages 6.03 NAMEstrdup, strndup, strdupa, strndupa − duplicate a string LIBRARYStandard C library (libc, −lc)SYNOPSIS#include <string.h>char *strdup(const char *s);char *strndup(const char s[.n], size_t n);
char *strdupa(const char *s);
char *strndupa(const char s[.n], size_t n);Feature Test Macro Requirements for glibc (see feature_test_macros(7)):strdup(): _XOPEN_SOURCE >= 500
|| /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCEstrndup(): Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_GNU_SOURCEstrdupa(),strndupa(): _GNU_SOURCEDESCRIPTIONThe strdup() function returns a pointer to a new string which is a duplicate of the string s. Memory for the new string is obtained with malloc(3), and can be freed with free(3).The strndup() function is similar, but copies at most n bytes. If s is longer than n, only n bytes are copied, and a terminating null byte ('\0') is added. strdupa() and strndupa() are similar, but use alloca(3) to allocate the buffer. RETURN VALUEOn success, the strdup() function returns a pointer to the duplicated string. It returns NULL if insufficient memory was available, with errno set to indicate the error. ERRORSENOMEM Insufficient memory available to allocate duplicate string. ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
STANDARDSstrdup() conforms to SVr4, 4.3BSD, POSIX.1-2001. strndup() conforms to POSIX.1-2008. strdupa() and strndupa() are GNU extensions. SEE ALSOalloca(3),calloc(3),free(3),malloc(3),realloc(3),string(3),wcsdup(3)0 Johanes Gumabo Data Size : 11,692 byte man-strndup.3Build : 2025-03-22, 13:26 : Visitor Screen : x Visitor Counter ( page / site ) : 29 / 2,243,493 Visitor ID : : Visitor IP : 216.73.216.210 : Visitor Provider : AMAZON-02 : Provider Position ( lat x lon ) : 39.962500 x -83.006100 : x Provider Accuracy Radius ( km ) : 20 : Provider City : Columbus : Provider Province : Ohio , : , Provider Country : United States : Provider Continent : North America : Visitor Recorder : Version : Visitor Recorder : Library : Online Linux Manual Page : Version : Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 25.03.22 Online Linux Manual Page : Library : lib_c - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Online Linux Manual Page : Library : lib_m - 24.10.03 - march=x86-64 - mtune=generic - Fedora.40 Data Base : Version : Online Linux Manual Page Database - 24.04.13 - march=x86-64 - mtune=generic - fedora-38 Data Base : Library : lib_c - 23.02.07 - march=x86-64 - mtune=generic - fedora.36
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