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.\" copyright (C) 1997 Cyrus Durgin <cider@speakeasy.org>
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.TH SKB_UNLINK 9 "November 24, 1997" "Linux DDI" "Networking Functions"
.hlm 0
.na
.SH NAME
__skb_unlink, skb_unlink \- remove an sk_buff from its list
.SH SYNOPSIS
.B #include <linux/skbuff.h>
.HP
.BI "void __skb_unlink(struct sk_buff " *skb ", struct sk_buff_head " *list ");"
.TP
.BI "void skb_unlink(struct sk_buff " *skb ");"
.hlm 1
.ad
.SH DESCRIPTION
The \fBskb_unlink\fP function is a wrapper for \fB__skb_unlink\fP.
\fB__skb_unlink\fP removes \fIskb\fP from its sk_buff_head.
It decrements the list qlen pointer, and cleanly detaches the sk_buff
from its queue.  This function should always be used instead of
performing this task manually, as it provides a clean, standardized
way of manipulating an sk_buff_head, and provides interrupt disabling (see
\fBNOTES\fP below.)  Most users will not call \fB__skb_unlink\fP
directly, as it requires that two arguments be supplied and does not
provide any interrupt handling.  \fBskb_unlink\fP determines the list
from which \fIskb\fP should be detached, and disables interrupts.
.SH "RETURN VALUE"
None.
.SH NOTES
It is important to note the difference between not only \fB__skb_unlink\fP
and \fBskb_unlink\fP, but all the \fB__skb_\fP functions and their
\fBskb_\fP counterparts.  Essentially, the \fB__skb_\fP functions are
non-atomic, and should only be used with interrupts disabled.  As a convenience,
the \fBskb_\fP functions are provided, which perform interrupt disable /
enable wrapper functionality in addition to performing their specific tasks.
.SH AVAILABILITY
Linux 1.0+
.SH "SEE ALSO"
.hlm 0
.na
.BR intro "(9), " skb_dequeue "(9), " skb_insert "(9), " skb_queue_head "(9), " skb_queue_tail "(9)"
.ad
.hlm 1
.PP
/usr/src/linux/net/core/skbuff.c /usr/src/linux/net/ipv4/af_inet.c /usr/src/linux/net/ipv4/ip_output.c /usr/src/linux/net/ipv4/tcp.c
.SH AUTHOR
Cyrus Durgin <cider@speakeasy.org>