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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | SEE ALSO | COLOPHON |
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listmount(2) System Calls Manual listmount(2)
listmount - get a list of mount ID's
Standard C library (libc, -lc)
#include <linux/mount.h> /* Definition of struct mnt_id_req constants */
#include <unistd.h>
int syscall(size_t n;
SYS_listmount, struct mnt_id_req *req,
uint64_t mnt_ids[n], size_t n,
unsigned long flags);
#include <linux/mount.h>
struct mnt_id_req {
__u32 size; /* sizeof(struct mnt_id_req) */
__u64 mnt_id; /* The parent mnt_id being searched */
__u64 param; /* The next mnt_id we want to find */
};
Note: glibc provides no wrapper for listmount(), necessitating the
use of syscall(2).
To access the mounts in your namespace, you must have
CAP_SYS_ADMIN in the user namespace.
This function returns a list of mount IDs under the req.mnt_id.
This is meant to be used in conjuction with statmount(2) in order
to provide a way to iterate and discover mounted file systems.
The mnt_id_req structure
req.size is used by the kernel to determine which struct
mnt_id_req is being passed in, it should always be set to
sizeof(struct mnt_id_req).
req.mnt_id is the parent mnt_id that we will list from, which can
either be LSMT_ROOT which means the root mount of the current
mount namespace, or a mount ID obtained from either statx(2) using
STATX_MNT_ID_UNIQUE or from listmount(2).
req.param is used to tell the kernel what mount ID to start the
list from. This is useful if multiple calls to listmount(2) are
required. This can be set to the last mount ID returned in order
to resume from a previous spot in the list.
On success, the number of entries filled into mnt_ids is returned;
0 if there are no more mounts left. On error, -1 is returned, and
errno is set to indicate the error.
EPERM Permission is denied for accessing this mount.
EFAULT req or mnt_ids points to a location outside the process's
accessible address space.
EINVAL Invalid flag specified in flags.
EINVAL req is of insufficient size to be utilized.
E2BIG req is too large, the limit is the architectures page size.
ENOENT The specified req.mnt_id doesn't exist.
ENOMEM Out of memory (i.e., kernel memory).
Linux.
statmount(2), statx(2)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-06-28 listmount(2)
Pages that refer to this page: listmount(2), statmount(2), statx(2)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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