2012/8/14 Alexander Kjeldaas <alexander.kjeld...@gmail.com>: > > > 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. >
The check would be unreliable, the file's existence doesn't imply that it's executable. Furthermore it would add unnecessary overhead, createProcess can be run thousands of times in a program and should be lean and mean. Niklas > Alexander > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
