Last change
on this file was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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File size:
627 bytes
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1 | #include <signal.h>
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2 |
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3 | void (*sigset(int sig, void (*handler)(int)))(int)
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4 | {
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5 | struct sigaction sa, sa_old;
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6 | sigset_t mask;
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7 |
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8 | sigemptyset(&mask);
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9 | if (sigaddset(&mask, sig) < 0)
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10 | return SIG_ERR;
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11 |
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12 | if (handler == SIG_HOLD) {
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13 | if (sigaction(sig, 0, &sa_old) < 0)
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14 | return SIG_ERR;
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15 | if (sigprocmask(SIG_BLOCK, &mask, &mask) < 0)
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16 | return SIG_ERR;
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17 | } else {
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18 | sa.sa_handler = handler;
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19 | sa.sa_flags = 0;
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20 | sigemptyset(&sa.sa_mask);
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21 | if (sigaction(sig, &sa, &sa_old) < 0)
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22 | return SIG_ERR;
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23 | if (sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0)
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24 | return SIG_ERR;
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25 | }
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26 | return sigismember(&mask, sig) ? SIG_HOLD : sa_old.sa_handler;
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27 | }
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