projects / unix-history / blame
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1 | .\" Copyright (c) 1983 The Regents of the University of California. |
| 2 | .\" All rights reserved. | |
| d35f9a62 | 3 | .\" |
| 91cff1e1 | 4 | .\" %sccs.include.redist.man% |
| 88b3ccf2 | 5 | .\" |
| 91cff1e1 | 6 | .\" @(#)sigblock.2 6.5 (Berkeley) %G% |
| d35f9a62 | 7 | .\" |
| 19165f3e | 8 | .TH SIGBLOCK 2 "" |
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9 | .UC 5 |
| 10 | .SH NAME | |
| 11 | sigblock \- block signals | |
| 12 | .SH SYNOPSIS | |
| 13 | .nf | |
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14 | .B #include <signal.h> |
| 15 | ||
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16 | .B sigblock(mask); |
| 17 | .B int mask; | |
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18 | |
| 19 | .B mask = sigmask(signum) | |
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20 | .SH DESCRIPTION |
| 21 | .I Sigblock | |
| 22 | causes the signals specified in | |
| 23 | .I mask | |
| 24 | to be added to the set of signals currently | |
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25 | being blocked from delivery. |
| 26 | Signals are blocked if the | |
| 18d4134b | 27 | corresponding bit in |
| d35f9a62 | 28 | .I mask |
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29 | is a 1; the macro |
| 30 | .I sigmask | |
| 31 | is provided to construct the mask for a given | |
| 32 | .IR signum . | |
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33 | .PP |
| 34 | It is not possible to block SIGKILL, | |
| 35 | SIGSTOP, or SIGCONT; this restriction is silently | |
| 36 | imposed by the system. | |
| 37 | .SH "RETURN VALUE | |
| 38 | The previous set of masked signals is returned. | |
| 39 | .SH "SEE ALSO" | |
| fa6ed5be | 40 | kill(2), sigvec(2), sigsetmask(2) |