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Remove dead pread and pwrite replacement code.

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pread() and pwrite() are in SUSv2, and all targeted Unix systems have
them.

Previously, we defined pg_pread and pg_pwrite to emulate these function
with lseek() on old Unixen.  The names with a pg_ prefix were a reminder
of a portability hazard: they might change the current file position.
That hazard is gone, so we can drop the prefixes.

Since the remaining replacement code is Windows-only, move it into
src/port/win32p{read,write}.c, and move the declarations into
src/include/port/win32_port.h.

No need for vestigial HAVE_PREAD, HAVE_PWRITE macros as they were only
used for declarations in port.h which have now moved into win32_port.h.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Greg Stark <stark@mit.edu>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CA+hUKGJ3LHeP9w5Fgzdr4G8AnEtJ=z=p6hGDEm4qYGEUX5B6fQ@mail.gmail.com
This commit is contained in:
Thomas Munro
2022-08-05 09:42:31 +12:00
parent 71f5dc6dfb
commit cf112c1220
23 changed files with 76 additions and 137 deletions
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4
src/backend/storage/file/fd.c
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@ -2063,7 +2063,7 @@ FileRead(File file, char *buffer, int amount, off_t offset,
retry:
pgstat_report_wait_start(wait_event_info);
returnCode = pg_pread(vfdP->fd, buffer, amount, offset);
returnCode = pread(vfdP->fd, buffer, amount, offset);
pgstat_report_wait_end();
if (returnCode < 0)
@ -2145,7 +2145,7 @@ FileWrite(File file, char *buffer, int amount, off_t offset,
retry:
errno = 0;
pgstat_report_wait_start(wait_event_info);
returnCode = pg_pwrite(VfdCache[file].fd, buffer, amount, offset);
returnCode = pwrite(VfdCache[file].fd, buffer, amount, offset);
pgstat_report_wait_end();
/* if write didn't set errno, assume problem is no disk space */