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FreeBSD 11.0 - man page for insque (freebsd section 3)

INSQUE(3)						   BSD Library Functions Manual 						 INSQUE(3)

insque, remque -- doubly-linked list management
Standard C Library (libc, -lc)
#include <search.h> void insque(void *element1, void *pred); void remque(void *element);
The insque() and remque() functions encapsulate the ever-repeating task of doing insertion and removal operations on doubly linked lists. The functions expect their arguments to point to a structure whose first and second members are pointers to the next and previous element, respectively. The insque() function also allows the pred argument to be a NULL pointer for the initialization of a new list's head element.
The insque() and remque() functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').
The insque() and remque() functions appeared in 4.2BSD. In FreeBSD 5.0, they reappeared conforming to IEEE Std 1003.1-2001 (``POSIX.1'').
October 10, 2002 BSD