libselinux: preserve errno in selinux_log()

selinux_log() is used in many error branches, where the caller might
expect errno to bet set, e.g. label_file.c::lookup_all():

    if (match_count) {
		*match_count = 0;
		result = calloc(data->nspec, sizeof(struct spec*));
	} else {
		result = calloc(1, sizeof(struct spec*));
	}
	if (!result) {
		selinux_log(SELINUX_ERROR, "Failed to allocate %zu bytes of data\n",
			    data->nspec * sizeof(struct spec*));
		goto finish;
	}

Preserve errno in the macro wrapper itself, also preventing accidental
errno modifications in client specified SELINUX_CB_LOG callbacks.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>

0 files changed, 0 insertions, 0 deletions