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authorRichard W.M. Jones <rjones@redhat.com>2019-01-18 10:11:14 +0000
committerMax Reitz <mreitz@redhat.com>2019-01-31 00:38:19 +0100
commitd339d766d1e52157e487bc412822e60c0a44e692 (patch)
tree6d46750887f8a13d5a2afe1909facc2f8f94b124 /qemu-img.c
parent70018a149c4bb14f60e6954e0d42311f305fe2c7 (diff)
qemu-io: Add generic function for reinitializing optind.
On FreeBSD 11.2: $ nbdkit memory size=1M --run './qemu-io -f raw -c "aio_write 0 512" $nbd' Parsing error: non-numeric argument, or extraneous/unrecognized suffix -- aio_write After main option parsing, we reinitialize optind so we can parse each command. However reinitializing optind to 0 does not work on FreeBSD. What happens when you do this is optind remains 0 after the option parsing loop, and the result is we try to parse argv[optind] == argv[0] == "aio_write" as if it was the first parameter. The FreeBSD manual page says: In order to use getopt() to evaluate multiple sets of arguments, or to evaluate a single set of arguments multiple times, the variable optreset must be set to 1 before the second and each additional set of calls to getopt(), and the variable optind must be reinitialized. (From the rest of the man page it is clear that optind must be reinitialized to 1). The glibc man page says: A program that scans multiple argument vectors, or rescans the same vector more than once, and wants to make use of GNU extensions such as '+' and '-' at the start of optstring, or changes the value of POSIXLY_CORRECT between scans, must reinitialize getopt() by resetting optind to 0, rather than the traditional value of 1. (Resetting to 0 forces the invocation of an internal initialization routine that rechecks POSIXLY_CORRECT and checks for GNU extensions in optstring.) This commit introduces an OS-portability function called qemu_reset_optind which provides a way of resetting optind that works on FreeBSD and platforms that use optreset, while keeping it the same as now on other platforms. Note that the qemu codebase sets optind in many other places, but in those other places it's setting a local variable and not using getopt. This change is only needed in places where we are using getopt and the associated global variable optind. Signed-off-by: Richard W.M. Jones <rjones@redhat.com> Message-id: 20190118101114.11759-2-rjones@redhat.com Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'qemu-img.c')
-rw-r--r--qemu-img.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/qemu-img.c b/qemu-img.c
index ad04f59565..25288c4d18 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -4962,7 +4962,7 @@ int main(int argc, char **argv)
return 0;
}
argv += optind;
- optind = 0;
+ qemu_reset_optind();
if (!trace_init_backends()) {
exit(1);