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Commit830e8e3

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committed
Fix error message on short read of pg_control
Instead of saying "error: success", indicate that we got a working readbut it was too short.
1 parent4a9b44d commit830e8e3

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2 files changed

+38
-13
lines changed

2 files changed

+38
-13
lines changed

‎src/backend/access/transam/xlog.c‎

Lines changed: 12 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -4311,6 +4311,7 @@ ReadControlFile(void)
43114311
{
43124312
pg_crc32ccrc;
43134313
intfd;
4314+
intr;
43144315

43154316
/*
43164317
* Read data...
@@ -4324,10 +4325,17 @@ ReadControlFile(void)
43244325
errmsg("could not open control file \"%s\": %m",
43254326
XLOG_CONTROL_FILE)));
43264327

4327-
if (read(fd,ControlFile,sizeof(ControlFileData))!=sizeof(ControlFileData))
4328-
ereport(PANIC,
4329-
(errcode_for_file_access(),
4330-
errmsg("could not read from control file: %m")));
4328+
r=read(fd,ControlFile,sizeof(ControlFileData));
4329+
if (r!=sizeof(ControlFileData))
4330+
{
4331+
if (r<0)
4332+
ereport(PANIC,
4333+
(errcode_for_file_access(),
4334+
errmsg("could not read from control file: %m")));
4335+
else
4336+
ereport(PANIC,
4337+
(errmsg("could not read from control file: read %d bytes, expected %d",r, (int)sizeof(ControlFileData))));
4338+
}
43314339

43324340
close(fd);
43334341

‎src/common/controldata_utils.c‎

Lines changed: 26 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -41,6 +41,7 @@ get_controlfile(char *DataDir, const char *progname)
4141
intfd;
4242
charControlFilePath[MAXPGPATH];
4343
pg_crc32ccrc;
44+
intr;
4445

4546
ControlFile=palloc(sizeof(ControlFileData));
4647
snprintf(ControlFilePath,MAXPGPATH,"%s/global/pg_control",DataDir);
@@ -59,18 +60,34 @@ get_controlfile(char *DataDir, const char *progname)
5960
}
6061
#endif
6162

62-
if (read(fd,ControlFile,sizeof(ControlFileData))!=sizeof(ControlFileData))
63+
r=read(fd,ControlFile,sizeof(ControlFileData));
64+
if (r!=sizeof(ControlFileData))
65+
{
66+
if (r<0)
6367
#ifndefFRONTEND
64-
ereport(ERROR,
65-
(errcode_for_file_access(),
66-
errmsg("could not read file \"%s\": %m",ControlFilePath)));
68+
ereport(ERROR,
69+
(errcode_for_file_access(),
70+
errmsg("could not read file \"%s\": %m",ControlFilePath)));
6771
#else
68-
{
69-
fprintf(stderr,_("%s: could not read file \"%s\": %s\n"),
70-
progname,ControlFilePath,strerror(errno));
71-
exit(EXIT_FAILURE);
72-
}
72+
{
73+
fprintf(stderr,_("%s: could not read file \"%s\": %s\n"),
74+
progname,ControlFilePath,strerror(errno));
75+
exit(EXIT_FAILURE);
76+
}
7377
#endif
78+
else
79+
#ifndefFRONTEND
80+
ereport(ERROR,
81+
(errmsg("could not read file \"%s\": read %d bytes, expected %d",
82+
ControlFilePath,r, (int)sizeof(ControlFileData))));
83+
#else
84+
{
85+
fprintf(stderr,_("%s: could not read file \"%s\": read %d bytes, expected %d\n"),
86+
progname,ControlFilePath,r, (int)sizeof(ControlFileData));
87+
exit(EXIT_FAILURE);
88+
}
89+
#endif
90+
}
7491

7592
close(fd);
7693

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