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If running the external command fails in "argv mode" (ie. when not using the shell), then exit with either 126 or 127 as defined by POSIX. This is mostly the same as what bash does, see execute_cmd.c:shell_execve in the bash sources. Note: saving errno around perror(3) if necessary, otherwise you will see different behaviour between verbose and non-verbose mode. In non-verbose mode, perror(3) tried to print to a closed file descriptor, failing and overwriting errno. That took some time to debug.
Libguestfs is tools and a library for accessing and modifying guest disk images. For more information see the home page: http://libguestfs.org/ For discussion, development, patches, etc. please use the mailing list: http://www.redhat.com/mailman/listinfo/libguestfs To find out how to build libguestfs from source, read: docs/guestfs-building.pod http://libguestfs.org/guestfs-building.1.html man docs/guestfs-building.1 Copyright (C) 2009-2017 Red Hat Inc. The library is distributed under the LGPLv2+. The programs are distributed under the GPLv2+. Please see the files COPYING and COPYING.LIB for full license information. The examples are under a very liberal license.