| sigvec.2 (119893) | sigvec.2 (131504) |
|---|---|
| 1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 16 unchanged lines hidden (view full) --- 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)sigvec.2 8.2 (Berkeley) 4/19/94 | 1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 16 unchanged lines hidden (view full) --- 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)sigvec.2 8.2 (Berkeley) 4/19/94 |
| 33.\" $FreeBSD: head/lib/libc/compat-43/sigvec.2 119893 2003-09-08 19:57:22Z ru $ | 33.\" $FreeBSD: head/lib/libc/compat-43/sigvec.2 131504 2004-07-02 23:52:20Z ru $ |
| 34.\" 35.Dd April 19, 1994 36.Dt SIGVEC 2 37.Os 38.Sh NAME 39.Nm sigvec 40.Nd software signal facilities 41.Sh LIBRARY --- 13 unchanged lines hidden (view full) --- 55.Bf -symbolic 56This interface is made obsolete by 57.Xr sigaction 2 . 58.Ef 59.Pp 60The system defines a set of signals that may be delivered to a process. 61Signal delivery resembles the occurrence of a hardware interrupt: 62the signal is blocked from further occurrence, the current process | 34.\" 35.Dd April 19, 1994 36.Dt SIGVEC 2 37.Os 38.Sh NAME 39.Nm sigvec 40.Nd software signal facilities 41.Sh LIBRARY --- 13 unchanged lines hidden (view full) --- 55.Bf -symbolic 56This interface is made obsolete by 57.Xr sigaction 2 . 58.Ef 59.Pp 60The system defines a set of signals that may be delivered to a process. 61Signal delivery resembles the occurrence of a hardware interrupt: 62the signal is blocked from further occurrence, the current process |
| 63context is saved, and a new one is built. A process may specify a | 63context is saved, and a new one is built. 64A process may specify a |
| 64.Em handler 65to which a signal is delivered, or specify that a signal is to be 66.Em blocked 67or 68.Em ignored . 69A process may also specify that a default action is to be taken 70by the system when a signal occurs. 71Normally, signal handlers execute on the current stack | 65.Em handler 66to which a signal is delivered, or specify that a signal is to be 67.Em blocked 68or 69.Em ignored . 70A process may also specify that a default action is to be taken 71by the system when a signal occurs. 72Normally, signal handlers execute on the current stack |
| 72of the process. This may be changed, on a per-handler basis, | 73of the process. 74This may be changed, on a per-handler basis, |
| 73so that signals are taken on a special 74.Em "signal stack" . 75.Pp 76All signals have the same 77.Em priority . 78Signal routines execute with the signal that caused their 79invocation 80.Em blocked , 81but other signals may yet occur. 82A global 83.Em "signal mask" 84defines the set of signals currently blocked from delivery | 75so that signals are taken on a special 76.Em "signal stack" . 77.Pp 78All signals have the same 79.Em priority . 80Signal routines execute with the signal that caused their 81invocation 82.Em blocked , 83but other signals may yet occur. 84A global 85.Em "signal mask" 86defines the set of signals currently blocked from delivery |
| 85to a process. The signal mask for a process is initialized 86from that of its parent (normally 0). It | 87to a process. 88The signal mask for a process is initialized 89from that of its parent (normally 0). 90It |
| 87may be changed with a 88.Xr sigblock 2 89or 90.Xr sigsetmask 2 91call, or when a signal is delivered to the process. 92.Pp 93When a signal 94condition arises for a process, the signal is added to a set of | 91may be changed with a 92.Xr sigblock 2 93or 94.Xr sigsetmask 2 95call, or when a signal is delivered to the process. 96.Pp 97When a signal 98condition arises for a process, the signal is added to a set of |
| 95signals pending for the process. If the signal is not currently | 99signals pending for the process. 100If the signal is not currently |
| 96.Em blocked | 101.Em blocked |
| 97by the process then it is delivered to the process. When a signal | 102by the process then it is delivered to the process. 103When a signal |
| 98is delivered, the current state of the process is saved, 99a new signal mask is calculated (as described below), | 104is delivered, the current state of the process is saved, 105a new signal mask is calculated (as described below), |
| 100and the signal handler is invoked. The call to the handler | 106and the signal handler is invoked. 107The call to the handler |
| 101is arranged so that if the signal handling routine returns 102normally the process will resume execution in the context 103from before the signal's delivery. 104If the process wishes to resume in a different context, then it 105must arrange to restore the previous context itself. 106.Pp 107When a signal is delivered to a process a new signal mask is 108installed for the duration of the process' signal handler --- 5 unchanged lines hidden (view full) --- 114This mask is formed by taking the current signal mask, 115adding the signal to be delivered, and 116.Em or Ns 'ing 117in the signal mask associated with the handler to be invoked. 118.Pp 119The 120.Fn sigvec 121function | 108is arranged so that if the signal handling routine returns 109normally the process will resume execution in the context 110from before the signal's delivery. 111If the process wishes to resume in a different context, then it 112must arrange to restore the previous context itself. 113.Pp 114When a signal is delivered to a process a new signal mask is 115installed for the duration of the process' signal handler --- 5 unchanged lines hidden (view full) --- 121This mask is formed by taking the current signal mask, 122adding the signal to be delivered, and 123.Em or Ns 'ing 124in the signal mask associated with the handler to be invoked. 125.Pp 126The 127.Fn sigvec 128function |
| 122assigns a handler for a specific signal. If | 129assigns a handler for a specific signal. 130If |
| 123.Fa vec 124is non-zero, it 125specifies a handler routine and mask 126to be used when delivering the specified signal. 127Further, if the 128.Dv SV_ONSTACK 129bit is set in 130.Fa sv_flags , --- 208 unchanged lines hidden --- | 131.Fa vec 132is non-zero, it 133specifies a handler routine and mask 134to be used when delivering the specified signal. 135Further, if the 136.Dv SV_ONSTACK 137bit is set in 138.Fa sv_flags , --- 208 unchanged lines hidden --- |