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MDEV-8743: where O_CLOEXEC is available, use for innodb buf_dump

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As this is the only moderately critical fopened for writing file,
create an alternate path to use open and fdopen for non-glibc platforms
that support O_CLOEXEC (BSDs).

Tested on Linux (by modifing the GLIBC defination) to take this
alternate path:

$ cd /proc/23874
$ more fdinfo/71
pos:    0
flags:  02100001
mnt_id: 24
$ ls -la fd/71
l-wx------. 1 dan dan 64 Mar 14 13:30 fd/71 -> /dev/shm/var_auto_i7rl/mysqld.1/data/ib_buffer_pool.incomplete
This commit is contained in:
Daniel Black 2018-03-14 13:31:28 +11:00 committed by Jan Lindström
parent 930682c487
commit 8b54c31486
3 changed files with 33 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/my_global.h
View File

@ -601,6 +601,11 @@ typedef SOCKET_SIZE_TYPE size_socket;
#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif
#ifdef __GLIBC__
#define STR_O_CLOEXEC "e"
#else
#define STR_O_CLOEXEC ""
#endif
#ifndef SOCK_CLOEXEC
#define SOCK_CLOEXEC 0
#endif

15
storage/innobase/buf/buf0dump.cc
View File

@ -220,7 +220,20 @@ buf_dump(
buf_dump_status(STATUS_NOTICE, "Dumping buffer pool(s) to %s",
full_filename);
f = fopen(tmp_filename, "w");
#if defined(__GLIBC__) || defined(__WIN__) || O_CLOEXEC == 0
f = fopen(tmp_filename, "w" STR_O_CLOEXEC);
#else
{
int fd;
fd = open(tmp_filename, O_CREAT | O_TRUNC | O_CLOEXEC | O_WRONLY, 0640);
if (fd >= 0) {
f = fdopen(fd, "w");
}
else {
f = NULL;
}
}
#endif
if (f == NULL) {
buf_dump_status(STATUS_ERR,
"Cannot open '%s' for writing: %s",

15
storage/xtradb/buf/buf0dump.cc
View File

@ -220,7 +220,20 @@ buf_dump(
buf_dump_status(STATUS_NOTICE, "Dumping buffer pool(s) to %s",
full_filename);
f = fopen(tmp_filename, "w");
#if defined(__GLIBC__) || defined(__WIN__) || O_CLOEXEC == 0
f = fopen(tmp_filename, "w" STR_O_CLOEXEC);
#else
{
int fd;
fd = open(tmp_filename, O_CREAT | O_TRUNC | O_CLOEXEC | O_WRONLY, 0640);
if (fd >= 0) {
f = fdopen(fd, "w");
}
else {
f = NULL;
}
}
#endif
if (f == NULL) {
buf_dump_status(STATUS_ERR,
"Cannot open '%s' for writing: %s",