Viewing file:  scm.h (1.5 KB) -rw-r--r--
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#ifndef __LINUX_NET_SCM_H
#define __LINUX_NET_SCM_H
/* Well, we should have at least one descriptor open
* to accept passed FDs 8)
*/
#define SCM_MAX_FD (OPEN_MAX-1)
struct scm_fp_list
{
int count;
struct file *fp[SCM_MAX_FD];
};
struct scm_cookie
{
struct ucred creds; /* Skb credentials */
struct scm_fp_list *fp; /* Passed files */
unsigned long seq; /* Connection seqno */
};
extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
extern void __scm_destroy(struct scm_cookie *scm);
extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
static __inline__ void scm_destroy(struct scm_cookie *scm)
{
if (scm && scm->fp)
__scm_destroy(scm);
}
static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
struct scm_cookie *scm)
{
memset(scm, 0, sizeof(*scm));
scm->creds.uid = current->uid;
scm->creds.gid = current->gid;
scm->creds.pid = current->pid;
if (msg->msg_controllen <= 0)
return 0;
return __scm_send(sock, msg, scm);
}
static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
struct scm_cookie *scm, int flags)
{
if (!msg->msg_control)
{
if (sock->passcred || scm->fp)
msg->msg_flags |= MSG_CTRUNC;
scm_destroy(scm);
return;
}
if (sock->passcred)
put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
if (!scm->fp)
return;
scm_detach_fds(msg, scm);
}
#endif /* __LINUX_NET_SCM_H */
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