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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2008-11-07 20:31:15 -0500 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2008-11-07 20:31:15 -0500 |
| commit | 7acf73dc3700f39ec009cf3efe30806e861ee5a1 (patch) | |
| tree | b7d875bb099dd9a71cd1ca82df31fda9d4a9f006 /man3 | |
| parent | c6ec368541cca9847e45adef3e6ef44423d2599b (diff) | |
| download | man-pages-7acf73dc3700f39ec009cf3efe30806e861ee5a1.tar.gz | |
makecontext.3: Add text on use of pointer arguments to makecontext()
Passing pointer arguments to makecontext() is possible,
but only on some architectures, and with no guarantees
of portability.
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=504699
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Reported-by: Paul Evans <leonerd@leonerd.org.uk>
Diffstat (limited to 'man3')
| -rw-r--r-- | man3/makecontext.3 | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/man3/makecontext.3 b/man3/makecontext.3 index 1815b227de..0a6a96dddb 100644 --- a/man3/makecontext.3 +++ b/man3/makecontext.3 @@ -22,7 +22,7 @@ .\" the source, must acknowledge the copyright and authors of this work. .\" 2006-08-02, mtk, Added example program .\" -.TH MAKECONTEXT 3 2008-08-06 "GNU" "Linux Programmer's Manual" +.TH MAKECONTEXT 3 2008-11-07 "GNU" "Linux Programmer's Manual" .SH NAME makecontext, swapcontext \- manipulate user context .SH SYNOPSIS @@ -113,6 +113,22 @@ 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. + +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 version 2.8 glibc makes some changes to +.BR makecontext (3), +to permit this on some 64-bit architectures (e.g., x86-64). .SH EXAMPLE .PP The example program below demonstrates the use of |