1PMEMLOG_APPEND(3)          PMDK Programmer's Manual          PMEMLOG_APPEND(3)
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NAME

6       pmemlog_append(),  pmemlog_appendv()  -  append bytes to the persistent
7       memory resident log file
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SYNOPSIS

10              #include <libpmemlog.h>
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12              int pmemlog_append(PMEMlogpool *plp, const void *buf, size_t count);
13              int pmemlog_appendv(PMEMlogpool *plp, const struct iovec *iov, int iovcnt);
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DESCRIPTION

16       The pmemlog_append() function appends count bytes from buf to the  cur‐
17       rent write offset in the log memory pool plp.  Calling this function is
18       analogous to appending to a file.  The append is atomic and  cannot  be
19       torn by a program failure or system crash.
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21       The  pmemlog_appendv() function appends to the log memory pool plp from
22       the scatter/gather list iov in a manner similar to writev(2).  The  en‐
23       tire  list  of buffers is appended atomically, as if the buffers in iov
24       were concatenated in order.  The append is atomic and cannot be torn by
25       a program failure or system crash.
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RETURN VALUE

28       On success, pmemlog_append() and pmemlog_appendv() return 0.  On error,
29       they return -1 and set errno appropriately.
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ERRORS

32       EINVAL The vector count iovcnt is less than zero.
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34       ENOSPC There is no room for the data in the log file.
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36       EROFS The log file is open in read-only mode.
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NOTES

39       Since libpmemlog(3) is designed as a low-latency code path, many of the
40       checks  routinely  done  by  the operating system for writev(2) are not
41       practical in the library's implementation of pmemlog_appendv().  No at‐
42       tempt is made to detect NULL or incorrect pointers, for example.
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SEE ALSO

45       writev(2), libpmemlog(7) and <http://pmem.io>
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49PMDK - pmemlog API version 1.1    2018-07-18                 PMEMLOG_APPEND(3)
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