NAME
liolistio - initiate a list of I/O requests SYNOPSIS
#include
int liolistio(int mode, struct aiocb *const aiocblist[], int nitems, struct sigevent *sevp); Link with -lrt. DESCRIPTION The liolistio() function initiates the list of I/O operations described by the array aiocblist. The mode operation has one of the following values: LIOWAIT The call blocks until all operations are complete. The sevp argument is ignored. LIONOWAIT The I/O operations are queued for processing and the call returns immediately. When all of the I/O operations com‐ plete, asynchronous notification occurs, as specified by the sevp argument; see sigevent(7) for details. If sevp is NULL, no asynchronous notification occurs. The aiocblist argument is an array of pointers to aiocb structures that describe I/O operations. These operations are executed in an unspecified order. The nitems argument specifies the size of the array aiocblist. NULL pointers in aiocblist are ignored. In each control block in aiocblist, the aiolioopcode field specifies the I/O operation to be initiated, as follows: LIOREAD Initiate a read operation. The operation is queued as for a call to aioread(3) specifying this control block. LIOWRITE Initiate a write operation. The operation is queued as for a call to aiowrite(3) specifying this control block. LIONOP Ignore this control block. The remaining fields in each control block have the same meanings as for aioread(3) and aiowrite(3). The aiosigevent fields of each con‐ trol block can be used to specify notifications for the individual I/O operations (see sigevent(7)). RETURN VALUE If mode is LIONOWAIT, liolistio() returns 0 if all I/O operations are
successfully queued. Otherwise, -1 is returned, and errno is set to indicate the error. If mode is LIOWAIT, liolistio() returns 0 when all of the I/O opera‐
tions have completed successfully. Otherwise, -1 is returned, and errno is set to indicate the error. The return status from liolistio() provides information only about the call itself, not about the individual I/O operations. One or more of the I/O operations may fail, but this does not prevent other operations completing. The status of individual I/O operations in aiocblist can be determined using aioerror(3). When an operation has completed, its return status can be obtained using aioreturn(3). Individual I/O operations can fail for the reasons described in aioread(3) and aiowrite(3). ERRORS The liolistio() function may fail for the following reasons: EAGAIN Out of resources. EAGAIN The number of I/O operations specified by nitems would cause the limit AIOMAX to be exceeded. EINVAL mode is invalid, or nitems exceeds the limit AIOLISTIOMAX. EINTR mode was LIOWAIT and a signal was caught before all I/O opera‐ tions completed. (This may even be one of the signals used for asynchronous I/O completion notification.) EIO One of more of the operations specified by aiocblist failed. The application can check the status of each operation using aioreturn(3). If liolistio() fails with the error EAGAIN, EINTR, or EIO, then some of the operations in aiocblist may have been initiated. If liolis‐ tio() fails for any other reason, then none of the I/O operations has been initiated. VERSIONS The liolistio() function is available since glibc 2.1. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌─────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────┼───────────────┼─────────┤
│liolistio() │ Thread safety │ MT-Safe │ └─────────────┴───────────────┴─────────┘ CONFORMING TO
POSIX.1-2001, POSIX.1-2008. NOTES It is a good idea to zero out the control blocks before use. The con‐ trol blocks must not be changed while the I/O operations are in progress. The buffer areas being read into or written from must not be accessed during the operations or undefined results may occur. The memory areas involved must remain valid. Simultaneous I/O operations specifying the same aiocb structure produce undefined results. SEE ALSO aiocancel(3), aioerror(3), aiofsync(3), aioreturn(3), aiosus‐ pend(3), aiowrite(3), aio(7) COLOPHON
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2012-05-08 LIOLISTIO(3)