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Provide pg_pread() and pg_pwrite() for random I/O.

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Forward to POSIX pread() and pwrite(), or emulate them if unavailable.
The emulation is not perfect as the file position is changed, so
we'll put pg_ prefixes on the names to minimize the risk of confusion
in future patches that might inadvertently try to mix pread() and read()
on the same file descriptor.

Author: Thomas Munro
Reviewed-by: Tom Lane, Jesper Pedersen
Discussion: https://postgr.es/m/CAEepm=02rapCpPR3ZGF2vW=SBHSdFYO_bz_f-wwWJonmA3APgw@mail.gmail.com
This commit is contained in:
Thomas Munro
2018-11-07 09:50:01 +13:00
parent b43df566b3
commit 3fd2a7932e
8 changed files with 168 additions and 0 deletions
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src/tools/msvc/Mkvcbuild.pm
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@@ -97,6 +97,7 @@ sub mkvcbuild
srandom.c getaddrinfo.c gettimeofday.c inet_net_ntop.c kill.c open.c
erand48.c snprintf.c strlcat.c strlcpy.c dirmod.c noblock.c path.c
dirent.c dlopen.c getopt.c getopt_long.c
pread.c pwrite.c
pg_strong_random.c pgcheckdir.c pgmkdirp.c pgsleep.c pgstrcasecmp.c
pqsignal.c mkdtemp.c qsort.c qsort_arg.c quotes.c system.c
sprompt.c strerror.c tar.c thread.c