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Add the SQLITE_MINIMUM_FILE_DESCRIPTOR compile-time option, for control over

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exactly which low-numbered file descriptors SQLite will use.

FossilOrigin-Name: ba5190534330a25722eeb7ea9c42da7a6d146014
This commit is contained in:
drh
2013-08-30 14:24:12 +00:00
parent 43398081a8
commit 77a3fdc1b0
3 changed files with 18 additions and 9 deletions
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11
src/os_unix.c
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@@ -551,6 +551,15 @@ static const char *unixNextSystemCall(sqlite3_vfs *p, const char *zName){
return 0;
}
/*
** Do not accept any file descriptor less than this value, in order to avoid
** opening database file using file descriptors that are commonly used for
** standard input, output, and error.
*/
#ifndef SQLITE_MINIMUM_FILE_DESCRIPTOR
# define SQLITE_MINIMUM_FILE_DESCRIPTOR 3
#endif
/*
** Invoke open(). Do so multiple times, until it either succeeds or
** fails for some reason other than EINTR.
@@ -581,7 +590,7 @@ static int robust_open(const char *z, int f, mode_t m){
if( errno==EINTR ) continue;
break;
}
if( fd>2 ) break;
if( fd>=SQLITE_MINIMUM_FILE_DESCRIPTOR ) break;
osClose(fd);
sqlite3_log(SQLITE_WARNING,
"attempt to open \"%s\" as file descriptor %d", z, fd);