Merging upstream version 6.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 236 deletions

diff --git a/man3/makecontext.3 b/man3/makecontext.3
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-'\" t
-.\" Copyright (C) 2001 Andries Brouwer (aeb@cwi.nl)
-.\" and Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" 2006-08-02, mtk, Added example program
-.\"
-.TH makecontext 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-makecontext, swapcontext \- manipulate user context
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <ucontext.h>
-.P
-.BI "void makecontext(ucontext_t *" ucp ", void (*" func ")(), int " argc \
-", ...);"
-.BI "int swapcontext(ucontext_t *restrict " oucp ,
-.BI "                const ucontext_t *restrict " ucp );
-.fi
-.SH DESCRIPTION
-In a System V-like environment, one has the type
-.I ucontext_t
-(defined in
-.I <ucontext.h>
-and described in
-.BR getcontext (3))
-and the four functions
-.BR getcontext (3),
-.BR setcontext (3),
-.BR makecontext (),
-and
-.BR swapcontext ()
-that allow user-level context switching
-between multiple threads of control within a process.
-.P
-The
-.BR makecontext ()
-function modifies the context pointed to
-by \fIucp\fP (which was obtained from a call to
-.BR getcontext (3)).
-Before invoking
-.BR makecontext (),
-the caller must allocate a new stack
-for this context and assign its address to \fIucp\->uc_stack\fP,
-and define a successor context and
-assign its address to \fIucp\->uc_link\fP.
-.P
-When this context is later activated (using
-.BR setcontext (3)
-or
-.BR swapcontext ())
-the function \fIfunc\fP is called,
-and passed the series of integer
-.RI ( int )
-arguments that follow
-.IR argc ;
-the caller must specify the number of these arguments in
-.IR argc .
-When this function returns, the successor context is activated.
-If the successor context pointer is NULL, the thread exits.
-.P
-The
-.BR swapcontext ()
-function saves the current context in
-the structure pointed to by \fIoucp\fP, and then activates the
-context pointed to by \fIucp\fP.
-.SH RETURN VALUE
-When successful,
-.BR swapcontext ()
-does not return.
-(But we may return later, in case \fIoucp\fP is
-activated, in which case it looks like
-.BR swapcontext ()
-returns 0.)
-On error,
-.BR swapcontext ()
-returns \-1 and sets
-.I errno
-to indicate the error.
-.SH ERRORS
-.TP
-.B ENOMEM
-Insufficient stack space left.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lb lb lbx
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR makecontext ()
-T}	Thread safety	T{
-.na
-.nh
-MT-Safe race:ucp
-T}
-T{
-.na
-.nh
-.BR swapcontext ()
-T}	Thread safety	T{
-.na
-.nh
-MT-Safe race:oucp race:ucp
-T}
-.TE
-.SH STANDARDS
-None.
-.SH HISTORY
-glibc 2.1.
-SUSv2, POSIX.1-2001.
-Removed in POSIX.1-2008,
-citing portability issues, and
-recommending that applications be rewritten to use POSIX threads instead.
-.SH NOTES
-The interpretation of \fIucp\->uc_stack\fP is just as in
-.BR sigaltstack (2),
-namely, this struct contains the start and length of a memory area
-to be used as the stack, regardless of the direction of growth of
-the stack.
-Thus, it is not necessary for the user program to
-worry about this direction.
-.P
-On architectures where
-.I int
-and pointer types are the same size
-(e.g., x86-32, where both types are 32 bits),
-you may be able to get away with passing pointers as arguments to
-.BR makecontext ()
-following
-.IR argc .
-However, doing this is not guaranteed to be portable,
-is undefined according to the standards,
-and won't work on architectures where pointers are larger than
-.IR int s.
-Nevertheless, starting with glibc 2.8, glibc makes some changes to
-.BR makecontext (),
-to permit this on some 64-bit architectures (e.g., x86-64).
-.SH EXAMPLES
-The example program below demonstrates the use of
-.BR getcontext (3),
-.BR makecontext (),
-and
-.BR swapcontext ().
-Running the program produces the following output:
-.P
-.in +4n
-.EX
-.RB "$" " ./a.out"
-main: swapcontext(&uctx_main, &uctx_func2)
-func2: started
-func2: swapcontext(&uctx_func2, &uctx_func1)
-func1: started
-func1: swapcontext(&uctx_func1, &uctx_func2)
-func2: returning
-func1: returning
-main: exiting
-.EE
-.in
-.SS Program source
-\&
-.\" SRC BEGIN (makecontext.c)
-.EX
-#include <stdio.h>
-#include <stdlib.h>
-#include <ucontext.h>
-\&
-static ucontext_t uctx_main, uctx_func1, uctx_func2;
-\&
-#define handle_error(msg) \e
-    do { perror(msg); exit(EXIT_FAILURE); } while (0)
-\&
-static void
-func1(void)
-{
-    printf("%s: started\en", __func__);
-    printf("%s: swapcontext(&uctx_func1, &uctx_func2)\en", __func__);
-    if (swapcontext(&uctx_func1, &uctx_func2) == \-1)
-        handle_error("swapcontext");
-    printf("%s: returning\en", __func__);
-}
-\&
-static void
-func2(void)
-{
-    printf("%s: started\en", __func__);
-    printf("%s: swapcontext(&uctx_func2, &uctx_func1)\en", __func__);
-    if (swapcontext(&uctx_func2, &uctx_func1) == \-1)
-        handle_error("swapcontext");
-    printf("%s: returning\en", __func__);
-}
-\&
-int
-main(int argc, char *argv[])
-{
-    char func1_stack[16384];
-    char func2_stack[16384];
-\&
-    if (getcontext(&uctx_func1) == \-1)
-        handle_error("getcontext");
-    uctx_func1.uc_stack.ss_sp = func1_stack;
-    uctx_func1.uc_stack.ss_size = sizeof(func1_stack);
-    uctx_func1.uc_link = &uctx_main;
-    makecontext(&uctx_func1, func1, 0);
-\&
-    if (getcontext(&uctx_func2) == \-1)
-        handle_error("getcontext");
-    uctx_func2.uc_stack.ss_sp = func2_stack;
-    uctx_func2.uc_stack.ss_size = sizeof(func2_stack);
-    /* Successor context is f1(), unless argc > 1 */
-    uctx_func2.uc_link = (argc > 1) ? NULL : &uctx_func1;
-    makecontext(&uctx_func2, func2, 0);
-\&
-    printf("%s: swapcontext(&uctx_main, &uctx_func2)\en", __func__);
-    if (swapcontext(&uctx_main, &uctx_func2) == \-1)
-        handle_error("swapcontext");
-\&
-    printf("%s: exiting\en", __func__);
-    exit(EXIT_SUCCESS);
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR sigaction (2),
-.BR sigaltstack (2),
-.BR sigprocmask (2),
-.BR getcontext (3),
-.BR sigsetjmp (3)