database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-12 13:01:09 +03:00
Code Activity

Add additional VFS methods to retrieve system call pointers and to get a

Browse Source 
list of all changeable system calls.

FossilOrigin-Name: 38558363494e3a736dcb091dd859e76b7ccd78b0
This commit is contained in:
drh
2011-03-02 19:06:42 +00:00
parent e562be52cf
commit 1df30967af
5 changed files with 58 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
src/os_unix.c
View File

@@ -376,7 +376,9 @@ static struct unix_syscall {
/*
** This is the xSetSystemCall() method of sqlite3_vfs for all of the
** "unix" VFSes.
** "unix" VFSes. Return SQLITE_OK opon successfully updating the
** system call pointer, or SQLITE_NOTFOUND if there is no configurable
** system call named zName.
*/
static int unixSetSystemCall(
sqlite3_vfs *pNotUsed, /* The VFS pointer. Not used */
@@ -384,7 +386,7 @@ static int unixSetSystemCall(
void *pNewFunc /* Pointer to new system call value */
){
int i;
int rc = 0;
int rc = SQLITE_NOTFOUND;
if( zName==0 ){
/* If no zName is given, restore all system calls to their default
** settings and return NULL
@@ -392,7 +394,7 @@ static int unixSetSystemCall(
for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
if( aSyscall[i].pDefault ){
aSyscall[i].pCurrent = aSyscall[i].pDefault;
rc = 1;
rc = SQLITE_OK;
}
}
}else{
@@ -404,7 +406,7 @@ static int unixSetSystemCall(
if( aSyscall[i].pDefault==0 ){
aSyscall[i].pDefault = aSyscall[i].pCurrent;
}
rc = 1;
rc = SQLITE_OK;
if( pNewFunc==0 ) pNewFunc = aSyscall[i].pDefault;
aSyscall[i].pCurrent = pNewFunc;
break;
@@ -414,6 +416,40 @@ static int unixSetSystemCall(
return rc;
}
/*
** Return the value of a system call. Return NULL if zName is not a
** recognized system call name. NULL is also returned if the system call
** is currently undefined.
*/
static void *unixGetSystemCall(sqlite3_vfs *pNotUsed, const char *zName){
int i;
for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
if( strcmp(zName, aSyscall[i].zName)==0 ) return aSyscall[i].pCurrent;
}
return 0;
}
/*
** Return the name of the first system call after zName. If zName==NULL
** then return the name of the first system call. Return NULL if zName
** is the last system call or if zName is not the name of a valid
** system call.
*/
static const char *unixNextSystemCall(sqlite3_vfs *p, const char *zName){
int i;
if( zName==0 ){
i = -1;
}else{
for(i=0; i<sizeof(aSyscall)/sizeof(aSyscall[0])-1; i++){
if( strcmp(zName, aSyscall[0].zName)==0 ) break;
}
}
for(i++; i<sizeof(aSyscall)/sizeof(aSyscall[0]); i++){
if( aSyscall[0].pCurrent!=0 ) return aSyscall[0].zName;
}
return 0;
}
/*
** Helper functions to obtain and relinquish the global mutex. The
@@ -6497,6 +6533,8 @@ int sqlite3_os_init(void){
unixGetLastError, /* xGetLastError */ \
unixCurrentTimeInt64, /* xCurrentTimeInt64 */ \
unixSetSystemCall, /* xSetSystemCall */ \
unixGetSystemCall, /* xGetSystemCall */ \
unixNextSystemCall, /* xNextSystemCall */ \
}
/*