On 13 August 2012 23:49, Richard O'Keefe <o...@cs.otago.ac.nz> wrote:
> > On 13/08/2012, at 11:26 PM, Alexander Kjeldaas wrote: > > > > > This isn't that hard - a pipe shouldn't be needed anymore. Just require > a post-2003 glibc. > > > > fexecve is a system call in most BSDs. It is also implemented in glibc > using a /proc hack. > > fexecve is now in the Single Unix Specification, based on > POSIX as of 2008, I believe. However, > http://www.gnu.org/software/gnulib/manual/html_node/fexecve.html > says > Portability problems not fixed by Gnulib: > * This function is missing on many non-glibc platforms: MacOS X 10.5, > FreeBSD 6.0, > NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, > OSF/1 5.1, > Solaris 11 2010-11, Cygwin 1.5.x, mingw, MSVC 9, Interix 3.5, BeOS. > > That warning doesn't seem to be fully up to date. I'm using MacOS X 10.6.8 > and fexecve() isn't in the manuals or in <unistd.h>. > > FreeBSD 8.0 is covered. OpenBSD not covered OS X not covered http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man2/execve.2.html Solaris probably not covered. So support is pretty good, I'd say. For non-modern systems, checking the existence of the file first is possible. The race isn't important, and one can always upgrade to a modern operating system. Alexander
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