insque, remque - insert/remove an item from a queue


#include <search.h>

void insque(void *elem, void *prev);

void remque(void *elem);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

insque(), remque(): _SVID_SOURCE || _XOPEN_SOURCE >= 500


insque() and remque() are functions for manipulating doubly-linked lists. Each element in the list is a structure of which the first two structure elements are a forward and a backward pointer.

insque() inserts the element pointed to by elem immediately after the element pointed to by prev, which must not be NULL.

remque() removes the element pointed to by elem from the doubly-linked list.




Traditionally (e.g., SunOS, Linux libc 4 and libc 5), the arguments of these functions were of type struct qelem *, defined as:

struct qelem { struct qelem *q_forw; struct qelem *q_back; char q_data[1]; };

This is still what you will get if _GNU_SOURCE is defined before including <search.h>.

The location of the prototypes for these functions differs among several versions of Unix. The above is the POSIX version. Some systems place them in <string.h>. Linux libc4 and libc 5 placed them in <stdlib.h>.


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