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When a child fails without exec'ing, we want a well-known status; best is to match what env(1), nice(1), su(1), and other wrapper programs do. This patch adds enum values that later patches will use, and sets up virFork as the first client of EXIT_CANCELED for errors detected prior to even attempting exec, as well as virExec to distinguish between a missing executable vs. a binary that cannot be executed. This is a slight semantic change in the unlikely case of a child process failing to restore its signal mask - we now kill the child with a known status instead of relying on the caller to notice and do an appropriate _exit(). A subsequent patch will make further cleanups based on an audit of all callers. * src/internal.h (EXIT_CANCELED, EXIT_CANNOT_INVOKE) (EXIT_ENOENT): New enum. * src/util/vircommand.c (virFork): Document specific exit value if child aborts early. (virExec): Distinguish between various exec failures. * tests/commandtest.c (test1): Enhance test. (test22): New test. Signed-off-by: Eric Blake <eblake@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>