.TH "libnvmf_registry_update" 9 "libnvmf_registry_update" "October 2026" "libnvme API manual" LINUX
.SH NAME
libnvmf_registry_update \- Update an attribute in a controller's registry entry
.SH SYNOPSIS
.B "int" libnvmf_registry_update
.BI "(struct libnvme_global_ctx *ctx "  ","
.BI "const char *device "  ","
.BI "const char *attr "  ","
.BI "const char *value "  ");"
.SH ARGUMENTS
.IP "ctx" 12
libnvme global context; must not be NULL
.IP "device" 12
Kernel device name (e.g. "nvme3")
.IP "attr" 12
Attribute name to update (e.g. "owner")
.IP "value" 12
New attribute value, or NULL to remove the attribute file
.SH "DESCRIPTION"
Writes the attribute value to the controller's registry entry using an
atomic tmp-file rename.  If the entry does not exist, it is created
atomically the same way as on connect, including the best-effort seqnum
stamp for the udev cleanup rule.  If \fIvalue\fP is NULL, the attribute file is
removed instead; a missing entry is left alone in this case.
.SH "RETURN"
0 on success, negative errno from underlying system calls otherwise.