Note: support for file capabilities is anticipated in Linux 2.6.23+  

#include <sys/capability.h>

cap_t cap_get_file(const char *path_p);

int cap_set_file(const char *path_p, cap_t cap_p);

cap_t cap_get_fd(int fd);

int cap_set_fd(int fd, cap_t caps);  

cap_set_file and cap_set_fd set the values for all capability flags for all capabilities for the pathname pointed to by path_p or the file open on descriptor fd, with the capability state identified by cap_p. The new capability state of the file shall be completely determined by the contents of cap_p. A NULL value for cap_p is used to indicate that capabilities for the file should be deleted. For these functions to succeed, the calling process must have the CAP_SETFCAP capability enabled and either the effective user ID of the process must match the file owner or the calling process must have the effective flag of the CAP_FOWNER capability set. The effects of writing the capability state to any file type other than a regular file are undefined.  

cap_set_file and cap_set_fd return zero on success, and -1 on failure.

On failure, errno(3) is set to EACCES, EBADFD, ENAMETOOLONG, ENOENT, ENOMEM, ENOTDIR, EPERM, or EROFS.  

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