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Reformatted tables as lists; other minor reformattings and wording changes.
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man2/sigaction.2
300
man2/sigaction.2
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@ -263,111 +263,207 @@ fills in
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.IR si_band " and " si_fd .
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.PP
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.I si_code
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indicates why this signal was sent.
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It is a value, not a bitmask.
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The values which are possible for any signal are listed in this table:
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.TS
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tab(:) allbox;
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c s
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l l.
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\fIsi_code\fR
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Value:Signal origin
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SI_USER:kill(2) or raise(3)
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SI_KERNEL:The kernel
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SI_QUEUE:sigqueue(2)
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SI_TIMER:POSIX timer expired
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SI_MESGQ:POSIX message queue state changed (since Linux 2.6.6)
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SI_ASYNCIO:AIO completed
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SI_SIGIO:queued SIGIO
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SI_TKILL:tkill(2) or tgkill(2) (since Linux 2.4.19)
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is a value (not a bit mask)
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indicating why this signal was sent.
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The following list shows the values can be placed in
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.I si_code
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for any signal, along with reason that the signal was generated.
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.RS 4
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.TP 15
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.B SI_USER
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.BR kill (2)
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or
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.BR raise (3)
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.TP
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.B SI_KERNEL
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Sent by the kernel.
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.TP
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.B SI_QUEUE
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.BR sigqueue (2)
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.TP
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.B SI_TIMER
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POSIX timer expired
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.TP
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.B SI_MESGQ
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POSIX message queue state changed (since Linux 2.6.6); see
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.BR mq_notify (3)
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.TP
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.B SI_ASYNCIO
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AIO completed
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.TP
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.B SI_SIGIO
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queued SIGIO
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.TP
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.B SI_TKILL
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.BR tkill (2)
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or
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.BR tgkill (2)
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(since Linux 2.4.19)
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.\" SI_DETHREAD is defined in 2.6.9 sources, but isn't implemented
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.\" It appears to have been an idea that was tried during 2.5.6
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.\" through to 2.5.24 and then was backed out.
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.TE
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.TS
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tab(:) allbox;
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c s
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l l.
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SIGILL
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ILL_ILLOPC:illegal opcode
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ILL_ILLOPN:illegal operand
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ILL_ILLADR:illegal addressing mode
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ILL_ILLTRP:illegal trap
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ILL_PRVOPC:privileged opcode
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ILL_PRVREG:privileged register
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ILL_COPROC:coprocessor error
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ILL_BADSTK:internal stack error
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.TE
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.TS
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tab(:) allbox;
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c s
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l l.
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SIGFPE
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FPE_INTDIV:integer divide by zero
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FPE_INTOVF:integer overflow
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FPE_FLTDIV:floating point divide by zero
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FPE_FLTOVF:floating point overflow
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FPE_FLTUND:floating point underflow
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FPE_FLTRES:floating point inexact result
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FPE_FLTINV:floating point invalid operation
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FPE_FLTSUB:subscript out of range
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.TE
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.TS
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tab(:) allbox;
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c s
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l l.
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SIGSEGV
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SEGV_MAPERR:address not mapped to object
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SEGV_ACCERR:invalid permissions for mapped object
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.TE
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.TS
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tab(:) allbox;
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c s
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l l.
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SIGBUS
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BUS_ADRALN:invalid address alignment
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BUS_ADRERR:non-existent physical address
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BUS_OBJERR:object specific hardware error
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.TE
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.TS
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tab(:) allbox;
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c s
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l l.
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SIGTRAP
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TRAP_BRKPT:process breakpoint
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TRAP_TRACE:process trace trap
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.TE
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.TS
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tab(:) allbox;
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c s
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l l.
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SIGCHLD
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CLD_EXITED:child has exited
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CLD_KILLED:child was killed
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CLD_DUMPED:child terminated abnormally
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CLD_TRAPPED:traced child has trapped
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CLD_STOPPED:child has stopped
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CLD_CONTINUED:stopped child has continued (since Linux 2.6.9)
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.TE
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.TS
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tab(:) allbox;
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c s
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l l.
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SIGPOLL
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POLL_IN:data input available
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POLL_OUT:output buffers available
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POLL_MSG:input message available
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POLL_ERR:i/o error
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POLL_PRI:high priority input available
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POLL_HUP:device disconnected
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.TE
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.RE
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.PP
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The following values can be place in
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.I si_code
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for a
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.B SIGILL
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signal:
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.RS 4
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.TP 15
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.B ILL_ILLOPC
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illegal opcode
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.TP
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.B ILL_ILLOPN
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illegal operand
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.TP
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.B ILL_ILLADR
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illegal addressing mode
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.TP
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.B ILL_ILLTRP
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illegal trap
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.TP
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.B ILL_PRVOPC
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privileged opcode
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.TP
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.B ILL_PRVREG
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privileged register
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.TP
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.B ILL_COPROC
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coprocessor error
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.TP
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.B ILL_BADSTK
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internal stack error
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.RE
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.PP
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The following values can be place in
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.I si_code
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for a
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.B SIGFPE
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signal:
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.RS 4
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.TP 15
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.B FPE_INTDIV
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integer divide by zero
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.TP
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.B FPE_INTOVF
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integer overflow
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.TP
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.B FPE_FLTDIV
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floating point divide by zero
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.TP
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.B FPE_FLTOVF
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floating point overflow
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.TP
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.B FPE_FLTUND
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floating point underflow
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.TP
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.B FPE_FLTRES
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floating point inexact result
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.TP
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.B FPE_FLTINV
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floating point invalid operation
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.TP
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.B FPE_FLTSUB
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subscript out of range
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.RE
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.PP
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The following values can be place in
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.I si_code
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for a
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.B SIGSEGV
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signal:
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.RS 4
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.TP 15
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.B SEGV_MAPERR
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address not mapped to object
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.TP
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.B SEGV_ACCERR
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invalid permissions for mapped object
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.RE
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.PP
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The following values can be place in
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.I si_code
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for a
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.B SIGBUS
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signal:
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.RS 4
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.TP 15
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.B BUS_ADRALN
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invalid address alignment
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.TP
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.B BUS_ADRERR
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non-existent physical address
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.TP
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.B BUS_OBJERR
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object specific hardware error
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.RE
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.PP
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The following values can be place in
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.I si_code
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for a
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.B SIGTRAP
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signal:
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.RS 4
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.TP 15
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.B TRAP_BRKPT
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process breakpoint
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.TP
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.B TRAP_TRACE
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process trace trap
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.RE
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.PP
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The following values can be place in
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.I si_code
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for a
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.B SIGILL
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signal:
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.RS 4
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.TP 15
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.B CLD_EXITED
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child has exited
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.TP
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.B CLD_KILLED
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child was killed
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.TP
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.B CLD_DUMPED
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child terminated abnormally
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.TP
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.B CLD_TRAPPED
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traced child has trapped
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.TP
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.B CLD_STOPPED
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child has stopped
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.TP
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.B CLD_CONTINUED
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stopped child has continued (since Linux 2.6.9)
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.RE
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.PP
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The following values can be place in
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.I si_code
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for a
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.B SIGPOLL
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signal:
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.RS 4
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.TP 15
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.B POLL_IN
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data input available
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.TP
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.B POLL_OUT
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output buffers available
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.TP
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.B POLL_MSG
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input message available
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.TP
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.B POLL_ERR
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i/o error
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.TP
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.B POLL_PRI
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high priority input available
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.TP
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.B POLL_HUP
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device disconnected
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.RE
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.SH "RETURN VALUE"
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.BR sigaction ()
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returns 0 on success and \-1 on error.
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