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.\"     @(#)strdup.3	8.1 (Berkeley) 6/9/93
.\" $FreeBSD: src/lib/libc/string/strdup.3,v 1.7.2.2 2001/12/14 18:33:59 ru Exp $
.\" $DragonFly: src/lib/libc/string/strdup.3,v 1.5 2004/12/26 12:37:08 swildner Exp $
.\"
.Dd June 9, 1993
.Dt STRDUP 3
.Os
.Sh NAME
.Nm strdup
.Nd save a copy of a string
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In string.h
.Ft char *
.Fn strdup "const char *str"
.Sh DESCRIPTION
The
.Fn strdup
function
allocates sufficient memory for a copy
of the string
.Fa str ,
does the copy, and returns a pointer to it.
The pointer may subsequently be used as an
argument to the function
.Xr free 3 .
.Pp
If insufficient memory is available, NULL is returned.
.Sh ERRORS
The
.Nm
function may fail if:
.Bl -tag -width Er
.It Bq Er ENOMEM
No memory could be allocated for the copy of the string.
.El
.Sh SEE ALSO
.Xr free 3 ,
.Xr malloc 3
.Sh STANDARDS
The
.Nm
function conforms to
.St -p1003.1-2004 .
.Sh HISTORY
The
.Fn strdup
function first appeared in
.Bx 4.4 .