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ALLOCA Section: Linux Programmer's Manual (3) Updated: 29 November 2025 Index   NAME alloca - memory allocator   SYNOPSIS #include <stdlib.h> void *alloca( size_t size);   DESCRIPTION The alloca function allocates size bytes of space in the stack frame of the caller. This temporary space is automatically freed on return.   RETURN VALUES The alloca function returns a pointer to the beginning of the allocated space. If the allocation failed, a NULL pointer is returned.   CONFORMING TO There is evidence that the alloca function appeared in 32v, pwb, pwb.2, 3bsd, and 4bsd. There is a man page for it in BSD 4.3. Linux uses the GNU version.   BUGS The alloca function is machine dependent.   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION RETURN VALUES CONFORMING TO BUGS SEE ALSO This document was created by using the manual pages. Time: 11:58:02 GMT, March 24, 2025

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