1aiowait(3C) Standard C Library Functions aiowait(3C)
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6 aiowait - wait for completion of asynchronous I/O operation
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9 #include <sys/asynch.h>
10 #include <sys/time.h>
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12 aio_result_t *aiowait(const struct timeval *timeout);
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16 The aiowait() function suspends the calling process until one of its
17 outstanding asynchronous I/O operations completes, providing a synchro‐
18 nous method of notification.
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21 If timeout is a non-zero pointer, it specifies a maximum interval to
22 wait for the completion of an asynchronous I/O operation. If timeout is
23 a zero pointer, aiowait() blocks indefinitely. To effect a poll, the
24 timeout parameter should be non-zero, pointing to a zero-valued timeval
25 structure.
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28 The timeval structure is defined in <sys/time.h> and contains the fol‐
29 lowing members:
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31 long tv_sec; /* seconds */
32 long tv_usec; /* and microseconds */
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36 Upon successful completion, aiowait() returns a pointer to the result
37 structure used when the completed asynchronous I/O operation was
38 requested. Upon failure, aiowait() returns −1 and sets errno to indi‐
39 cate the error. aiowait() returns 0 if the time limit expires.
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42 The aiowait() function will fail if:
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44 EFAULT The timeout argument points to an address outside the address
45 space of the requesting process. See NOTES.
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48 EINTR The execution of aiowait() was interrupted by a signal.
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51 EINVAL There are no outstanding asynchronous I/O requests.
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54 EINVAL The tv_secs member of the timeval structure pointed to by
55 timeout is less than 0 or the tv_usecs member is greater than
56 the number of seconds in a microsecond.
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60 See attributes(5) for descriptions of the following attributes:
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65 ┌─────────────────────────────┬─────────────────────────────┐
66 │ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
67 ├─────────────────────────────┼─────────────────────────────┤
68 │MT-Level │Safe │
69 └─────────────────────────────┴─────────────────────────────┘
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72 aiocancel(3C), aioread(3C), attributes(5)
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75 The aiowait() function is the only way to dequeue an asynchronous noti‐
76 fication. It can be used either inside a SIGIO signal handler or in the
77 main program. One SIGIO signal can represent several queued events.
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80 Passing an illegal address as timeout will result in setting errno to
81 EFAULT only if detected by the application process.
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85SunOS 5.11 5 Feb 2008 aiowait(3C)