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Provide pg_preadv() and pg_pwritev().

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Provide synchronous vectored file I/O routines.  These map to preadv()
and pwritev(), with fallback implementations for systems that don't have
them.  Also provide a wrapper pg_pwritev_with_retry() that automatically
retries on short writes.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CA%2BhUKGJA%2Bu-220VONeoREBXJ9P3S94Y7J%2BkqCnTYmahvZJwM%3Dg%40mail.gmail.com
This commit is contained in:
Thomas Munro
2021-01-11 14:37:13 +13:00
parent 01334c92fa
commit 13a021f3e8
9 changed files with 238 additions and 34 deletions
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src/include/port.h
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@@ -431,6 +431,8 @@ extern ssize_t pg_pread(int fd, void *buf, size_t nbyte, off_t offset);
extern ssize_t pg_pwrite(int fd, const void *buf, size_t nbyte, off_t offset);
#endif
/* For pg_pwritev() and pg_preadv(), see port/pg_iovec.h. */
#if !HAVE_DECL_STRLCAT
extern size_t strlcat(char *dst, const char *src, size_t siz);
#endif