strstr, strcasestr: replace on platforms with broken memchr * modules/strstr: Split into... * modules/strstr-simple: ...new module that does not care about performance, but does care about glibc bug. * m4/strstr.m4 (gl_FUNC_STRSTR): Split... (gl_FUNC_STRSTR_SIMPLE): ...into new macro, which replaces strstr if platform memchr is broken, per Debian bug 521737. * m4/strcasestr.m4 (gl_FUNC_STRCASESTR_SIMPLE): React to broken memchr. * m4/memchr.m4 (gl_FUNC_MEMCHR): Only expand once. * doc/posix-functions/strstr.texi (strstr): Document the fix. * doc/glibc-functions/strcasestr.texi (strcasestr): Likewise. * modules/mountlist (Depends-on): Add strstr-simple. * modules/gen-uni-tables (Depends-on): Likewise. * modules/argz (Depends-on): Add strstr. Signed-off-by: Eric Blake <ebb9@byu.net>

@node shmat
@section @code{shmat}
@findex shmat

POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/shmat.html}

Gnulib module: ---

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
mingw, BeOS.
@item
Attempts to @code{shmat} into a previously malloc-ed region fail on SunOS 4,
with @code{errno} set to @code{EINVAL}, even if there is an @code{munmap} call
in between.
@item
On Linux, the flag @code{SHM_REMAP} is needed in order to force @code{shmat}
to replace existing memory mappings in the specify address range.  On other
platforms, it is not needed.
@end itemize