1sigwait(3) Library Functions Manual sigwait(3)
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6 sigwait - wait for a signal
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9 Standard C library (libc, -lc)
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12 #include <signal.h>
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14 int sigwait(const sigset_t *restrict set, int *restrict sig);
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16 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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18 sigwait():
19 Since glibc 2.26:
20 _POSIX_C_SOURCE >= 199506L
21 glibc 2.25 and earlier:
22 _POSIX_C_SOURCE
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25 The sigwait() function suspends execution of the calling thread until
26 one of the signals specified in the signal set set becomes pending.
27 The function accepts the signal (removes it from the pending list of
28 signals), and returns the signal number in sig.
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30 The operation of sigwait() is the same as sigwaitinfo(2), except that:
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32 • sigwait() returns only the signal number, rather than a siginfo_t
33 structure describing the signal.
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35 • The return values of the two functions are different.
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38 On success, sigwait() returns 0. On error, it returns a positive error
39 number (listed in ERRORS).
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42 EINVAL set contains an invalid signal number.
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45 For an explanation of the terms used in this section, see at‐
46 tributes(7).
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48 ┌────────────────────────────────────────────┬───────────────┬─────────┐
49 │Interface │ Attribute │ Value │
50 ├────────────────────────────────────────────┼───────────────┼─────────┤
51 │sigwait() │ Thread safety │ MT-Safe │
52 └────────────────────────────────────────────┴───────────────┴─────────┘
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55 sigwait() is implemented using sigtimedwait(2).
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57 The glibc implementation of sigwait() silently ignores attempts to wait
58 for the two real-time signals that are used internally by the NPTL
59 threading implementation. See nptl(7) for details.
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62 POSIX.1-2008.
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65 POSIX.1-2001.
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68 See pthread_sigmask(3).
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71 sigaction(2), signalfd(2), sigpending(2), sigsuspend(2),
72 sigwaitinfo(2), sigsetops(3), signal(7)
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76Linux man-pages 6.05 2023-07-20 sigwait(3)