idr_alloc(9) [centos man page]

IDR_ALLOC(9)						  Basic Kernel Library Functions					      IDR_ALLOC(9)

NAME

       idr_alloc - allocate new idr entry

SYNOPSIS

       int idr_alloc(struct idr * idr, void * ptr, int start, int end, gfp_t gfp_mask);

ARGUMENTS

       idr
	   the (initialized) idr

       ptr
	   pointer to be associated with the new id

       start
	   the minimum id (inclusive)

       end
	   the maximum id (exclusive, <= 0 for max)

       gfp_mask
	   memory allocation flags

DESCRIPTION

       Allocate an id in [start, end) and associate it with ptr. If no ID is available in the specified range, returns -ENOSPC. On memory
       allocation failure, returns -ENOMEM.

       Note that end is treated as max when <= 0. This is to always allow using start + N as end as long as N is inside integer range.

       The user is responsible for exclusively synchronizing all operations which may modify idr. However, read-only accesses such as idr_find or
       iteration can be performed under RCU read lock provided the user destroys ptr in RCU-safe way after removal from idr.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							      IDR_ALLOC(9)

MALLOC(3)						   BSD Library Functions Manual 						 MALLOC(3)

NAME

     reallocf -- general purpose memory allocation functions

LIBRARY

     Utility functions from BSD systems (libbsd, -lbsd)

SYNOPSIS

     #include <bsd/stdlib.h>

     void *
     reallocf(void *ptr, size_t size);

DESCRIPTION

     The reallocf() function changes the size of the previously allocated memory referenced by ptr to size bytes.  The contents of the memory are
     unchanged up to the lesser of the new and old sizes.  If the new size is larger, the contents of the newly allocated portion of the memory
     are undefined.  Upon success, the memory referenced by ptr is freed and a pointer to the newly allocated memory is returned.  Note that
     reallocf() may move the memory allocation, resulting in a different return value than ptr.  If ptr is NULL, the reallocf() function behaves
     identically to malloc() for the specified size.  Upon failure, when the requested memory cannot be allocated, the passed pointer is freed to
     ease the problems with traditional coding styles for reallocf() causing memory leaks in libraries.

RETURN VALUES

     The reallocf() function returns a pointer, possibly identical to ptr, to the allocated memory if successful; otherwise a NULL pointer is
     returned, and errno is set to ENOMEM if the error was the result of an allocation failure.  The buffer is deallocated in this case.

SEE ALSO

     brk(2), mmap(2), alloca(3), calloc(3), free(3), malloc(3), posix_memalign(3), realloc(3),

HISTORY

     The reallocf() function first appeared in FreeBSD 3.0.

BSD
								September 26, 2009							       BSD