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Overview
Comment:Add test infrastructure (and some tests) to inject faults into os_unix.c using the new xSetSystemCall interface.
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SHA1: 0e1d20dfaeea5ab285d16aa4b8f02b61b1d2bc10
User & Date: dan 2011-03-28 19:10:07
Context
2011-03-29
01:47
Fix the documentation for the sqlite3_column_*_name() functions to describe that the information can be invalidated when a prepared statement is reprepared by the first invocation of an sqlite3_step() for a particular execution cycle. check-in: 7270f80a user: drh tags: trunk
2011-03-28
19:10
Add test infrastructure (and some tests) to inject faults into os_unix.c using the new xSetSystemCall interface. check-in: 0e1d20df user: dan tags: trunk
2011-03-24
17:43
Minor change to sqlite3Utf8Read() to make consistent with READ_UTF8() usage and avoid implementation defined usages of <<. Added some additional UTF-8 test cases. check-in: 7173b392 user: shaneh tags: trunk
Changes
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Changes to main.mk.

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  $(TOP)/src/test_pcache.c \
  $(TOP)/src/test_quota.c \
  $(TOP)/src/test_rtree.c \
  $(TOP)/src/test_schema.c \
  $(TOP)/src/test_server.c \
  $(TOP)/src/test_stat.c \
  $(TOP)/src/test_superlock.c \

  $(TOP)/src/test_tclvar.c \
  $(TOP)/src/test_thread.c \
  $(TOP)/src/test_vfs.c \
  $(TOP)/src/test_wsd.c

#TESTSRC += $(TOP)/ext/fts2/fts2_tokenizer.c
#TESTSRC += $(TOP)/ext/fts3/fts3_tokenizer.c







>







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  $(TOP)/src/test_pcache.c \
  $(TOP)/src/test_quota.c \
  $(TOP)/src/test_rtree.c \
  $(TOP)/src/test_schema.c \
  $(TOP)/src/test_server.c \
  $(TOP)/src/test_stat.c \
  $(TOP)/src/test_superlock.c \
  $(TOP)/src/test_syscall.c \
  $(TOP)/src/test_tclvar.c \
  $(TOP)/src/test_thread.c \
  $(TOP)/src/test_vfs.c \
  $(TOP)/src/test_wsd.c

#TESTSRC += $(TOP)/ext/fts2/fts2_tokenizer.c
#TESTSRC += $(TOP)/ext/fts3/fts3_tokenizer.c

Changes to src/tclsqlite.c.

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    extern int Sqlitetestintarray_Init(Tcl_Interp*);
    extern int Sqlitetestvfs_Init(Tcl_Interp *);
    extern int SqlitetestStat_Init(Tcl_Interp*);
    extern int Sqlitetestrtree_Init(Tcl_Interp*);
    extern int Sqlitequota_Init(Tcl_Interp*);
    extern int Sqlitemultiplex_Init(Tcl_Interp*);
    extern int SqliteSuperlock_Init(Tcl_Interp*);


#ifdef SQLITE_ENABLE_ZIPVFS
    extern int Zipvfs_Init(Tcl_Interp*);
    Zipvfs_Init(interp);
#endif

    Sqliteconfig_Init(interp);
................................................................................
    Sqlitetestintarray_Init(interp);
    Sqlitetestvfs_Init(interp);
    SqlitetestStat_Init(interp);
    Sqlitetestrtree_Init(interp);
    Sqlitequota_Init(interp);
    Sqlitemultiplex_Init(interp);
    SqliteSuperlock_Init(interp);


    Tcl_CreateObjCommand(interp,"load_testfixture_extensions",init_all_cmd,0,0);

#ifdef SQLITE_SSE
    Sqlitetestsse_Init(interp);
#endif
  }







>







 







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    extern int Sqlitetestintarray_Init(Tcl_Interp*);
    extern int Sqlitetestvfs_Init(Tcl_Interp *);
    extern int SqlitetestStat_Init(Tcl_Interp*);
    extern int Sqlitetestrtree_Init(Tcl_Interp*);
    extern int Sqlitequota_Init(Tcl_Interp*);
    extern int Sqlitemultiplex_Init(Tcl_Interp*);
    extern int SqliteSuperlock_Init(Tcl_Interp*);
    extern int SqlitetestSyscall_Init(Tcl_Interp*);

#ifdef SQLITE_ENABLE_ZIPVFS
    extern int Zipvfs_Init(Tcl_Interp*);
    Zipvfs_Init(interp);
#endif

    Sqliteconfig_Init(interp);
................................................................................
    Sqlitetestintarray_Init(interp);
    Sqlitetestvfs_Init(interp);
    SqlitetestStat_Init(interp);
    Sqlitetestrtree_Init(interp);
    Sqlitequota_Init(interp);
    Sqlitemultiplex_Init(interp);
    SqliteSuperlock_Init(interp);
    SqlitetestSyscall_Init(interp);

    Tcl_CreateObjCommand(interp,"load_testfixture_extensions",init_all_cmd,0,0);

#ifdef SQLITE_SSE
    Sqlitetestsse_Init(interp);
#endif
  }

Added src/test_syscall.c.























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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/*
** 2011 March 28
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** The code in this file implements a Tcl interface used to test error
** handling in the os_unix.c module. Wrapper functions that support fault
** injection are registered as the low-level OS functions using the 
** xSetSystemCall() method of the VFS. The Tcl interface is as follows:
**
**
**   test_syscall install LIST
**     Install wrapper functions for all system calls in argument LIST.
**     LIST must be a list consisting of zero or more of the following
**     literal values:
**
**         open        close      access   getcwd   stat      fstat    
**         ftruncate   fcntl      read     pread    pread64   write
**         pwrite      pwrite64   fchmod   fallocate
**
**   test_syscall uninstall
**     Uninstall all wrapper functions.
**
**   test_syscall fault ?COUNT PERSIST?
**     If [test_syscall fault] is invoked without the two arguments, fault
**     injection is disabled. Otherwise, fault injection is configured to
**     cause a failure on the COUNT'th next call to a system call with a
**     wrapper function installed. A COUNT value of 1 means fail the next
**     system call. 
** 
**     Argument PERSIST is interpreted as a boolean. If true, the all
**     system calls following the initial failure also fail. Otherwise, only
**     the single transient failure is injected.
**
**   test_syscall errno CALL ERRNO
**     Set the value that the global "errno" is set to following a fault
**     in call CALL. Argument CALL must be one of the system call names
**     listed above (under [test_syscall install]). ERRNO is a symbolic
**     name (i.e. "EACCES"). Not all errno codes are supported. Add extra
**     to the aErrno table in function test_syscall_errno() below as 
**     required.
*/

#include "sqlite3.h"
#include "tcl.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#ifdef SQLITE_OS_UNIX

#include <sys/types.h>
#include <errno.h>

static struct TestSyscallGlobal {
  int bPersist;                   /* 1 for persistent errors, 0 for transient */
  int nCount;                     /* Fail after this many more calls */
  int nFail;                      /* Number of failures that have occurred */
} gSyscall = { 0, 0 };

static int ts_open(const char *, int, int);
static int ts_close(int fd);
static int ts_access(const char *zPath, int mode);
static char *ts_getcwd(char *zPath, size_t nPath);
static int ts_stat(const char *zPath, struct stat *p);
static int ts_fstat(int fd, struct stat *p);
static int ts_ftruncate(int fd, off_t n);
static int ts_fcntl(int fd, int cmd, ... );
static int ts_read(int fd, void *aBuf, size_t nBuf);
static int ts_pread(int fd, void *aBuf, size_t nBuf, off_t off);
static int ts_pread64(int fd, void *aBuf, size_t nBuf, off_t off);
static int ts_write(int fd, const void *aBuf, size_t nBuf);
static int ts_pwrite(int fd, const void *aBuf, size_t nBuf, off_t off);
static int ts_pwrite64(int fd, const void *aBuf, size_t nBuf, off_t off);
static int ts_fchmod(int fd, mode_t mode);
static int ts_fallocate(int fd, off_t off, off_t len);


struct TestSyscallArray {
  const char *zName;
  sqlite3_syscall_ptr xTest;
  sqlite3_syscall_ptr xOrig;
  int default_errno;              /* Default value for errno following errors */
  int custom_errno;               /* Current value for errno if error */
} aSyscall[] = {
  /*  0 */ { "open",      (sqlite3_syscall_ptr)ts_open,      0, EACCES, 0 },
  /*  1 */ { "close",     (sqlite3_syscall_ptr)ts_close,     0, 0, 0 },
  /*  2 */ { "access",    (sqlite3_syscall_ptr)ts_access,    0, 0, 0 },
  /*  3 */ { "getcwd",    (sqlite3_syscall_ptr)ts_getcwd,    0, 0, 0 },
  /*  4 */ { "stat",      (sqlite3_syscall_ptr)ts_stat,      0, 0, 0 },
  /*  5 */ { "fstat",     (sqlite3_syscall_ptr)ts_fstat,     0, 0, 0 },
  /*  6 */ { "ftruncate", (sqlite3_syscall_ptr)ts_ftruncate, 0, 0, 0 },
  /*  7 */ { "fcntl",     (sqlite3_syscall_ptr)ts_fcntl,     0, 0, 0 },
  /*  8 */ { "read",      (sqlite3_syscall_ptr)ts_read,      0, 0, 0 },
  /*  9 */ { "pread",     (sqlite3_syscall_ptr)ts_pread,     0, 0, 0 },
  /* 10 */ { "pread64",   (sqlite3_syscall_ptr)ts_pread64,   0, 0, 0 },
  /* 11 */ { "write",     (sqlite3_syscall_ptr)ts_write,     0, 0, 0 },
  /* 12 */ { "pwrite",    (sqlite3_syscall_ptr)ts_pwrite,    0, 0, 0 },
  /* 13 */ { "pwrite64",  (sqlite3_syscall_ptr)ts_pwrite64,  0, 0, 0 },
  /* 14 */ { "fchmod",    (sqlite3_syscall_ptr)ts_fchmod,    0, 0, 0 },
  /* 15 */ { "fallocate", (sqlite3_syscall_ptr)ts_fallocate, 0, 0, 0 },
           { 0, 0, 0, 0, 0 }
};

#define orig_open      ((int(*)(const char *, int, int))aSyscall[0].xOrig)
#define orig_close     ((int(*)(int))aSyscall[1].xOrig)
#define orig_access    ((int(*)(const char*,int))aSyscall[2].xOrig)
#define orig_getcwd    ((char*(*)(char*,size_t))aSyscall[3].xOrig)
#define orig_stat      ((int(*)(const char*,struct stat*))aSyscall[4].xOrig)
#define orig_fstat     ((int(*)(int,struct stat*))aSyscall[5].xOrig)
#define orig_ftruncate ((int(*)(int,off_t))aSyscall[6].xOrig)
#define orig_fcntl     ((int(*)(int,int,...))aSyscall[7].xOrig)
#define orig_read      ((ssize_t(*)(int,void*,size_t))aSyscall[8].xOrig)
#define orig_pread     ((ssize_t(*)(int,void*,size_t,off_t))aSyscall[9].xOrig)
#define orig_pread64   ((ssize_t(*)(int,void*,size_t,off_t))aSyscall[10].xOrig)
#define orig_write     ((ssize_t(*)(int,const void*,size_t))aSyscall[11].xOrig)
#define orig_pwrite    ((ssize_t(*)(int,const void*,size_t,off_t))\
                       aSyscall[12].xOrig)
#define orig_pwrite64  ((ssize_t(*)(int,const void*,size_t,off_t))\
                       aSyscall[13].xOrig)
#define orig_fchmod    ((int(*)(int,mode_t))aSyscall[14].xOrig)
#define orig_fallocate ((int(*)(int,off_t,off_t))aSyscall[15].xOrig)


/*
** This function is called exactly once from within each invocation of a
** system call wrapper in this file. It returns 1 if the function should
** fail, or 0 if it should succeed.
*/
static int tsIsFail(void){
  gSyscall.nCount--;
  if( gSyscall.nCount==0 || (gSyscall.nFail && gSyscall.bPersist) ){
    gSyscall.nFail++;
    return 1;
  }
  return 0;
}

/*
** Return the current error-number value for function zFunc. zFunc must be
** the name of a system call in the aSyscall[] table.
**
** Usually, the current error-number is the value that errno should be set
** to if the named system call fails. The exception is "fallocate". See 
** comments above the implementation of ts_fallocate() for details.
*/
static int tsErrno(const char *zFunc){
  int i;
  int nFunc = strlen(zFunc);
  for(i=0; aSyscall[i].zName; i++){
    if( strlen(aSyscall[i].zName)!=nFunc ) continue;
    if( memcmp(aSyscall[i].zName, zFunc, nFunc) ) continue;
    return aSyscall[i].custom_errno;
  }

  assert(0);
  return 0;
}

/*
** A wrapper around tsIsFail(). If tsIsFail() returns non-zero, set the
** value of errno before returning.
*/ 
static int tsIsFailErrno(const char *zFunc){
  if( tsIsFail() ){
    errno = tsErrno(zFunc);
    return 1;
  }
  return 0;
}

/*
** A wrapper around open().
*/
static int ts_open(const char *zFile, int flags, int mode){
  if( tsIsFailErrno("open") ){
    return -1;
  }
  return orig_open(zFile, flags, mode);
}

/*
** A wrapper around close().
*/
static int ts_close(int fd){
  if( tsIsFail() ){
    return -1;
  }
  return orig_close(fd);
}

/*
** A wrapper around access().
*/
static int ts_access(const char *zPath, int mode){
  if( tsIsFail() ){
    return -1;
  }
  return orig_access(zPath, mode);
}

/*
** A wrapper around getcwd().
*/
static char *ts_getcwd(char *zPath, size_t nPath){
  if( tsIsFail() ){
    return NULL;
  }
  return orig_getcwd(zPath, nPath);
}

/*
** A wrapper around stat().
*/
static int ts_stat(const char *zPath, struct stat *p){
  if( tsIsFail() ){
    return -1;
  }
  return orig_stat(zPath, p);
}

/*
** A wrapper around fstat().
*/
static int ts_fstat(int fd, struct stat *p){
  if( tsIsFail() ){
    return -1;
  }
  return orig_fstat(fd, p);
}

/*
** A wrapper around ftruncate().
*/
static int ts_ftruncate(int fd, off_t n){
  if( tsIsFail() ){
    return -1;
  }
  return orig_ftruncate(fd, n);
}

/*
** A wrapper around fcntl().
*/
static int ts_fcntl(int fd, int cmd, ... ){
  va_list ap;
  void *pArg;
  if( tsIsFail() ){
    return -1;
  }
  va_start(ap, cmd);
  pArg = va_arg(ap, void *);
  return orig_fcntl(fd, cmd, pArg);
}

/*
** A wrapper around read().
*/
static int ts_read(int fd, void *aBuf, size_t nBuf){
  if( tsIsFail() ){
    return -1;
  }
  return orig_read(fd, aBuf, nBuf);
}

/*
** A wrapper around pread().
*/
static int ts_pread(int fd, void *aBuf, size_t nBuf, off_t off){
  if( tsIsFail() ){
    return -1;
  }
  return orig_pread(fd, aBuf, nBuf, off);
}

/*
** A wrapper around pread64().
*/
static int ts_pread64(int fd, void *aBuf, size_t nBuf, off_t off){
  if( tsIsFail() ){
    return -1;
  }
  return orig_pread64(fd, aBuf, nBuf, off);
}

/*
** A wrapper around write().
*/
static int ts_write(int fd, const void *aBuf, size_t nBuf){
  if( tsIsFail() ){
    return -1;
  }
  return orig_write(fd, aBuf, nBuf);
}

/*
** A wrapper around pwrite().
*/
static int ts_pwrite(int fd, const void *aBuf, size_t nBuf, off_t off){
  if( tsIsFail() ){
    return -1;
  }
  return orig_pwrite(fd, aBuf, nBuf, off);
}

/*
** A wrapper around pwrite64().
*/
static int ts_pwrite64(int fd, const void *aBuf, size_t nBuf, off_t off){
  if( tsIsFail() ){
    return -1;
  }
  return orig_pwrite64(fd, aBuf, nBuf, off);
}

/*
** A wrapper around fchmod().
*/
static int ts_fchmod(int fd, mode_t mode){
  if( tsIsFail() ){
    return -1;
  }
  return orig_fchmod(fd, mode);
}

/*
** A wrapper around fallocate().
**
** SQLite assumes that the fallocate() function is compatible with
** posix_fallocate(). According to the Linux man page (2009-09-30):
**
**   posix_fallocate() returns  zero on success, or an error number on
**   failure. Note that errno is not set.
*/
static int ts_fallocate(int fd, off_t off, off_t len){
  if( tsIsFail() ){
    return tsErrno("fallocate");
  }
  return orig_fallocate(fd, off, len);
}

static int test_syscall_install(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_vfs *pVfs; 
  int nElem;
  int i;
  Tcl_Obj **apElem;

  if( objc!=3 ){
    Tcl_WrongNumArgs(interp, 2, objv, "SYSCALL-LIST");
    return TCL_ERROR;
  }
  if( Tcl_ListObjGetElements(interp, objv[2], &nElem, &apElem) ){
    return TCL_ERROR;
  }
  pVfs = sqlite3_vfs_find(0);

  for(i=0; i<nElem; i++){
    int iCall;
    int rc = Tcl_GetIndexFromObjStruct(interp, 
        apElem[i], aSyscall, sizeof(aSyscall[0]), "system-call", 0, &iCall
    );
    if( rc ) return rc;
    if( aSyscall[iCall].xOrig==0 ){
      aSyscall[iCall].xOrig = pVfs->xGetSystemCall(pVfs, aSyscall[iCall].zName);
      pVfs->xSetSystemCall(pVfs, aSyscall[iCall].zName, aSyscall[iCall].xTest);
    }
    aSyscall[iCall].custom_errno = aSyscall[iCall].default_errno;
  }

  return TCL_OK;
}

static int test_syscall_uninstall(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  sqlite3_vfs *pVfs; 
  int i;

  if( objc!=2 ){
    Tcl_WrongNumArgs(interp, 2, objv, "");
    return TCL_ERROR;
  }

  pVfs = sqlite3_vfs_find(0);
  for(i=0; aSyscall[i].zName; i++){
    if( aSyscall[i].xOrig ){
      pVfs->xSetSystemCall(pVfs, aSyscall[i].zName, aSyscall[i].xOrig);
      aSyscall[i].xOrig = 0;
    }
  }
  return TCL_OK;
}

static int test_syscall_fault(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  int nCount = 0;
  int bPersist = 0;

  if( objc!=2 && objc!=4 ){
    Tcl_WrongNumArgs(interp, 2, objv, "?COUNT PERSIST?");
    return TCL_ERROR;
  }

  if( objc==4 ){
    if( Tcl_GetIntFromObj(interp, objv[2], &nCount)
     || Tcl_GetBooleanFromObj(interp, objv[3], &bPersist)
    ){
      return TCL_ERROR;
    }
  }

  Tcl_SetObjResult(interp, Tcl_NewIntObj(gSyscall.nFail));
  gSyscall.nCount = nCount;
  gSyscall.bPersist = bPersist;
  gSyscall.nFail = 0;
  return TCL_OK;
}

static int test_syscall_errno(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  int iCall;
  int iErrno;
  int rc;

  struct Errno {
    const char *z;
    int i;
  } aErrno[] = {
    { "EACCES", EACCES },
    { 0, 0 }
  };

  if( objc!=4 ){
    Tcl_WrongNumArgs(interp, 2, objv, "SYSCALL ERRNO");
    return TCL_ERROR;
  }

  rc = Tcl_GetIndexFromObjStruct(interp, 
      objv[2], aSyscall, sizeof(aSyscall[0]), "system-call", 0, &iCall
  );
  if( rc!=TCL_OK ) return rc;
  rc = Tcl_GetIndexFromObjStruct(interp, 
      objv[3], aErrno, sizeof(aErrno[0]), "errno", 0, &iErrno
  );
  if( rc!=TCL_OK ) return rc;

  aSyscall[iCall].custom_errno = aErrno[iErrno].i;
  return TCL_OK;
}

static int test_syscall(
  void * clientData,
  Tcl_Interp *interp,
  int objc,
  Tcl_Obj *CONST objv[]
){
  struct SyscallCmd {
    const char *zName;
    Tcl_ObjCmdProc *xCmd;
  } aCmd[] = {
    { "fault",     test_syscall_fault },
    { "install",   test_syscall_install },
    { "uninstall", test_syscall_uninstall },
    { "errno",     test_syscall_errno },
    { 0, 0 }
  };
  int iCmd;
  int rc;

  if( objc<2 ){
    Tcl_WrongNumArgs(interp, 1, objv, "SUB-COMMAND ...");
    return TCL_ERROR;
  }
  rc = Tcl_GetIndexFromObjStruct(interp, 
      objv[1], aCmd, sizeof(aCmd[0]), "sub-command", 0, &iCmd
  );
  if( rc!=TCL_OK ) return rc;
  return aCmd[iCmd].xCmd(clientData, interp, objc, objv);
}

int SqlitetestSyscall_Init(Tcl_Interp *interp){
  struct SyscallCmd {
    const char *zName;
    Tcl_ObjCmdProc *xCmd;
  } aCmd[] = {
    { "test_syscall",     test_syscall},
  };
  int i;

  for(i=0; i<sizeof(aCmd)/sizeof(aCmd[0]); i++){
    Tcl_CreateObjCommand(interp, aCmd[i].zName, aCmd[i].xCmd, 0, 0);
  }
  return TCL_OK;
}
#else
int SqlitetestSyscall_Init(Tcl_Interp *interp){
  return TCL_OK;
}
#endif

Changes to test/malloc_common.tcl.

whitespace changes only

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# 2011 March 28
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/lock_common.tcl
source $testdir/malloc_common.tcl

if {[llength [info commands test_syscall]]==0} {
  finish_test
  return
} 

set testprefix sysfault

set FAULTSIM(vfsfault-transient) [list             \
  -injectinstall   vfsfault_install                \
  -injectstart     vfsfault_injectstart_t          \
  -injectstop      vfsfault_injectstop             \
  -injecterrlist   {}                              \
  -injectuninstall {test_syscall uninstall}        \
]
set FAULTSIM(vfsfault-persistent) [list            \
  -injectinstall   vfsfault_install                \
  -injectstart     vfsfault_injectstart_p          \
  -injectstop      vfsfault_injectstop             \
  -injecterrlist   {}                              \
  -injectuninstall {test_syscall uninstall}        \
]

proc vfsfault_injectstart_t {iFail} { test_syscall fault $iFail 0 }
proc vfsfault_injectstart_p {iFail} { test_syscall fault $iFail 1 }
proc vfsfault_injectstop    {}      { test_syscall fault }

faultsim_save_and_close

proc vfsfault_install {} { 
  test_syscall install {open getcwd}
}

do_faultsim_test 1 -faults vfsfault-* -prep {
  faultsim_restore
} -body {
  sqlite3 db test.db
  db eval {
    CREATE TABLE t1(a, b);
    INSERT INTO t1 VALUES(1, 2);
    PRAGMA journal_mode = WAL;
    INSERT INTO t1 VALUES(3, 4);
    SELECT * FROM t1;
    CREATE TEMP TABLE t2(x);
    INSERT INTO t2 VALUES('y');
  }
} -test {
  faultsim_test_result {0 {wal 1 2 3 4}}       \
    {1 {unable to open database file}}         \
    {1 {attempt to write a readonly database}}
}

finish_test