From 7f3caba522f4d24764f29d83aa2de9198bb7f01c Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 24 May 2024 06:52:22 +0200 Subject: Adding upstream version 6.8. Signed-off-by: Daniel Baumann --- man/man2/lookup_dcookie.2 | 86 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 man/man2/lookup_dcookie.2 (limited to 'man/man2/lookup_dcookie.2') diff --git a/man/man2/lookup_dcookie.2 b/man/man2/lookup_dcookie.2 new file mode 100644 index 0000000..8131b98 --- /dev/null +++ b/man/man2/lookup_dcookie.2 @@ -0,0 +1,86 @@ +.\" Copyright (C) 2003 John Levon +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.\" Modified 2004-06-17 Michael Kerrisk +.\" +.TH lookup_dcookie 2 2024-05-02 "Linux man-pages (unreleased)" +.SH NAME +lookup_dcookie \- return a directory entry's path +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.BR "#include " " /* Definition of " SYS_* " constants */" +.B #include +.P +.BI "int syscall(SYS_lookup_dcookie, uint64_t " cookie ", char *" buffer , +.BI " size_t " len ); +.fi +.P +.IR Note : +glibc provides no wrapper for +.BR lookup_dcookie (), +necessitating the use of +.BR syscall (2). +.SH DESCRIPTION +Look up the full path of the directory entry specified by the value +.IR cookie . +The cookie is an opaque identifier uniquely identifying a particular +directory entry. +The buffer given is filled in with the full path of the directory entry. +.P +For +.BR lookup_dcookie () +to return successfully, +the kernel must still hold a cookie reference to the directory entry. +.SH RETURN VALUE +On success, +.BR lookup_dcookie () +returns the length of the path string copied into the buffer. +On error, \-1 is returned, and +.I errno +is set to indicate the error. +.SH ERRORS +.TP +.B EFAULT +The buffer was not valid. +.TP +.B EINVAL +The kernel has no registered cookie/directory entry mappings at the +time of lookup, or the cookie does not refer to a valid directory entry. +.TP +.B ENAMETOOLONG +The name could not fit in the buffer. +.TP +.B ENOMEM +The kernel could not allocate memory for the temporary buffer holding +the path. +.TP +.B EPERM +The process does not have the capability +.B CAP_SYS_ADMIN +required to look up cookie values. +.TP +.B ERANGE +The buffer was not large enough to hold the path of the directory entry. +.SH STANDARDS +Linux. +.SH HISTORY +Linux 2.5.43. +.P +The +.B ENAMETOOLONG +error was added in Linux 2.5.70. +.SH NOTES +.BR lookup_dcookie () +is a special-purpose system call, currently used only by the +.BR oprofile (1) +profiler. +It relies on a kernel driver to register cookies for directory entries. +.P +The path returned may be suffixed by the string " (deleted)" if the directory +entry has been removed. +.SH SEE ALSO +.BR oprofile (1) -- cgit v1.2.3