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Linux 2.6 - man page for strdup (linux section 3)

STRDUP(3)						     Linux Programmer's Manual							 STRDUP(3)

NAME
strdup, strndup, strdupa, strndupa - duplicate a string
SYNOPSIS
#include <string.h> char *strdup(const char *s); char *strndup(const char *s, size_t n); char *strdupa(const char *s); char *strndupa(const char *s, 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 versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE strndup(): Since glibc 2.10: _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _GNU_SOURCE strdupa(), strndupa(): _GNU_SOURCE
DESCRIPTION
The 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. They are available only when using the GNU GCC suite, and suffer from the same limitations described in alloca(3).
RETURN VALUE
On 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 cause of the error.
ERRORS
ENOMEM Insufficient memory available to allocate duplicate string.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +--------------------------------+---------------+---------+ |Interface | Attribute | Value | +--------------------------------+---------------+---------+ |strdup(), strndup(), strdupa(), | Thread safety | MT-Safe | |strndupa() | | | +--------------------------------+---------------+---------+
CONFORMING TO
strdup() conforms to SVr4, 4.3BSD, POSIX.1-2001. strndup() conforms to POSIX.1-2008. strdupa() and strndupa() are GNU extensions.
SEE ALSO
alloca(3), calloc(3), free(3), malloc(3), realloc(3), string(3), wcsdup(3)
GNU
2019-03-06 STRDUP(3)

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