GNU/Linux man pages
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GNU/Linux |
CentOS 5.4 |
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lookup_dcookie(2) |
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lookup_dcookie − return a directory entry’s path
int lookup_dcookie(u64 cookie, char * buffer, size_t len);
Look up the full path of the directory entry specified by the value 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.
For lookup_dcookie() to return successfully, the kernel must still hold a cookie reference to the directory entry.
lookup_dcookie() is a special-purpose system call, currently used only by the oprofile profiler. It relies on a kernel driver to register cookies for directory entries.
The path returned may be suffixed by the string " (deleted)" if the directory entry has been removed.
On success, lookup_dcookie() returns the length of the path string copied into the buffer. On error, −1 is returned, and errno is set appropriately.
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EFAULT |
The buffer was not valid. | ||
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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. |
ENAMETOOLONG
The name could not fit in the buffer.
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ENOMEM |
The kernel could not allocate memory for the temporary buffer holding the path. | ||
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EPERM |
The process does not have the capability CAP_SYS_ADMIN required to look up cookie values. | ||
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ERANGE |
The buffer was not large enough to hold the path of the directory entry. |
lookup_dcookie() is Linux-specific.
Since Linux 2.5.43. The ENAMETOOLONG error return was added in 2.5.70.
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lookup_dcookie(2) | |