From 28035bed1c565eace7db18971a7e960a8d1f7c44 Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Tue, 31 Oct 2023 11:45:30 +0100 Subject: [PATCH] dump: Improve some dump-guest-memory error messages MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Zero @length is rejected with "Invalid parameter 'length'". Improve to "parameter 'length' expects a non-zero length". qemu_open_old() is a wrapper around qemu_open_internal() that throws away error information. Switch to the wrapper that doesn't: qemu_create(). Example improvement: (qemu) dump-guest-memory /dev/fdset/x 0 1 Error: Could not open '/dev/fdset/x': Invalid argument becomes Error: Could not parse fdset /dev/fdset/x @protocol values not starting with "fd:" or "file:" are rejected with "Invalid parameter 'protocol'". Improve to "parameter 'protocol' must start with 'file:' or 'fd:'". While there, make the conditional checking @protocol a little more obvious. Signed-off-by: Markus Armbruster Reviewed-by: Marc-André Lureau Message-Id: <20231031104531.3169721-5-armbru@redhat.com> --- dump/dump.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/dump/dump.c b/dump/dump.c index 2d0b5bd22b..ec2cfcf9f7 100644 --- a/dump/dump.c +++ b/dump/dump.c @@ -1828,7 +1828,7 @@ static void dump_init(DumpState *s, int fd, bool has_format, s->fd = fd; if (has_filter && !length) { - error_setg(errp, QERR_INVALID_PARAMETER, "length"); + error_setg(errp, "parameter 'length' expects a non-zero size"); goto cleanup; } s->filter_area_begin = begin; @@ -2088,7 +2088,7 @@ void qmp_dump_guest_memory(bool paging, const char *protocol, { ERRP_GUARD(); const char *p; - int fd = -1; + int fd; DumpState *s; bool detach_p = false; bool kdump_raw = false; @@ -2175,18 +2175,14 @@ void qmp_dump_guest_memory(bool paging, const char *protocol, if (fd == -1) { return; } - } - - if (strstart(protocol, "file:", &p)) { - fd = qemu_open_old(p, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRUSR); + } else if (strstart(protocol, "file:", &p)) { + fd = qemu_create(p, O_WRONLY | O_TRUNC | O_BINARY, S_IRUSR, errp); if (fd < 0) { - error_setg_file_open(errp, errno, p); return; } - } - - if (fd == -1) { - error_setg(errp, QERR_INVALID_PARAMETER, "protocol"); + } else { + error_setg(errp, + "parameter 'protocol' must start with 'file:' or 'fd:'"); return; } if (kdump_raw && lseek(fd, 0, SEEK_CUR) == (off_t) -1) { -- 2.11.4.GIT