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Dishonest docs ?

$ man getcontext

GETCONTEXT(2)       Linux Programmer's Manual       GETCONTEXT(2)


NAME
       getcontext, setcontext - get or set the user context


$ cat test.c
#include <stdio.h>
#include <ucontext.h>

main()
{
        ucontext_t uc;

        if (getcontext(&uc) == -1) {
                perror("getcontext");
        }
}
$ cc test.c -o test
/tmp/ccONPX2k.o: In function `main':
/tmp/ccONPX2k.o(.text+0x11): warning: getcontext is not implemented and will always fail