Zbigniew Jędrzejewski-Szmek
254d1313ae
-1 was used everywhere, but -EBADF or -EBADFD started being used in various places. Let's make things consistent in the new style. Note that there are two candidates: EBADF 9 Bad file descriptor EBADFD 77 File descriptor in bad state Since we're initializating the fd, we're just assigning a value that means "no fd yet", so it's just a bad file descriptor, and the first errno fits better. If instead we had a valid file descriptor that became invalid because of some operation or state change, the other errno would fit better. In some places, initialization is dropped if unnecessary.
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <fcntl.h>
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#include <linux/dm-ioctl.h>
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#include <sys/ioctl.h>
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#include "dm-util.h"
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#include "fd-util.h"
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#include "string-util.h"
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int dm_deferred_remove_cancel(const char *name) {
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_cleanup_close_ int fd = -EBADF;
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struct message {
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struct dm_ioctl dm_ioctl;
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struct dm_target_msg dm_target_msg;
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char msg_text[STRLEN("@cancel_deferred_remove") + 1];
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} _packed_ message = {
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.dm_ioctl = {
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.version = {
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DM_VERSION_MAJOR,
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DM_VERSION_MINOR,
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DM_VERSION_PATCHLEVEL
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},
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.data_size = sizeof(struct message),
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.data_start = sizeof(struct dm_ioctl),
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},
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.msg_text = "@cancel_deferred_remove",
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};
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assert(name);
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if (strlen(name) >= sizeof(message.dm_ioctl.name))
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return -ENODEV; /* A device with a name longer than this cannot possibly exist */
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strncpy_exact(message.dm_ioctl.name, name, sizeof(message.dm_ioctl.name));
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fd = open("/dev/mapper/control", O_RDWR|O_CLOEXEC);
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if (fd < 0)
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return -errno;
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if (ioctl(fd, DM_TARGET_MSG, &message))
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return -errno;
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return 0;
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}
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