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Reset properly errno before calling write()

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6cb3372 enforces errno to ENOSPC when less bytes than what is expected
have been written when it is unset, though it forgot to properly reset
errno before doing a system call to write(), causing errno to
potentially come from a previous system call.

Reported-by: Tom Lane
Author: Michael Paquier
Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/31797.1533326676@sss.pgh.pa.us
This commit is contained in:
Michael Paquier
2018-08-05 05:31:56 +09:00
parent 75224ac20e
commit 58673b4a5f
7 changed files with 14 additions and 0 deletions
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3
src/backend/replication/logical/origin.c
View File

@ -576,6 +576,7 @@ CheckPointReplicationOrigin(void)
tmppath)));
/* write magic */
errno = 0;
if ((write(tmpfd, &magic, sizeof(magic))) != sizeof(magic))
{
int save_errno = errno;
@ -619,6 +620,7 @@ CheckPointReplicationOrigin(void)
/* make sure we only write out a commit that's persistent */
XLogFlush(local_lsn);
errno = 0;
if ((write(tmpfd, &disk_state, sizeof(disk_state))) !=
sizeof(disk_state))
{
@ -641,6 +643,7 @@ CheckPointReplicationOrigin(void)
/* write out the CRC */
FIN_CRC32C(crc);
errno = 0;
if ((write(tmpfd, &crc, sizeof(crc))) != sizeof(crc))
{
int save_errno = errno;

1
src/backend/replication/logical/reorderbuffer.c
View File

@ -2421,6 +2421,7 @@ ReorderBufferSerializeChange(ReorderBuffer *rb, ReorderBufferTXN *txn,
ondisk->size = sz;
errno = 0;
pgstat_report_wait_start(WAIT_EVENT_REORDER_BUFFER_WRITE);
if (write(fd, rb->outbuf, ondisk->size) != ondisk->size)
{

1
src/backend/replication/logical/snapbuild.c
View File

@ -1609,6 +1609,7 @@ SnapBuildSerialize(SnapBuild *builder, XLogRecPtr lsn)
ereport(ERROR,
(errmsg("could not open file \"%s\": %m", path)));
errno = 0;
pgstat_report_wait_start(WAIT_EVENT_SNAPBUILD_WRITE);
if ((write(fd, ondisk, needed_length)) != needed_length)
{

1
src/backend/replication/slot.c
View File

@ -1275,6 +1275,7 @@ SaveSlotToPath(ReplicationSlot *slot, const char *dir, int elevel)
SnapBuildOnDiskChecksummedSize);
FIN_CRC32C(cp.checksum);
errno = 0;
pgstat_report_wait_start(WAIT_EVENT_REPLICATION_SLOT_WRITE);
if ((write(fd, &cp, sizeof(cp))) != sizeof(cp))
{