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- Do not call VGLEnd() and exit() to terminate the program

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immediately when a signal is caught.  Instead, defer
  program termination until the next call to VGLCheckSwitch().
  Otherwise, the video card may not be restored correctly
  if the signal is seen while inside libvgl functions.

MFC after: 1 week
This commit is contained in:
yokota 2001-07-24 11:15:20 +00:00
parent 1b8c225dc1
commit bd11ff6285
1 changed files with 15 additions and 2 deletions
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17
lib/libvgl/main.c
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@ -54,6 +54,7 @@ static int VGLOldMode;
static size_t VGLBufSize;
static byte *VGLMem = MAP_FAILED;
static int VGLSwitchPending;
static int VGLAbortPending;
static int VGLOnDisplay;
static unsigned int VGLCurWindow;
static int VGLInitDone = 0;
@ -67,6 +68,8 @@ struct vt_mode smode;
if (!VGLInitDone)
return;
VGLInitDone = 0;
VGLSwitchPending = 0;
VGLAbortPending = 0;
signal(SIGUSR1, SIG_IGN);
@ -103,8 +106,12 @@ struct vt_mode smode;
static void
VGLAbort()
{
VGLEnd();
exit(0);
VGLAbortPending = 1;
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGSEGV, SIG_IGN);
signal(SIGBUS, SIG_IGN);
signal(SIGUSR2, SIG_IGN);
}
static void
@ -132,9 +139,11 @@ VGLInit(int mode)
signal(SIGTERM, VGLAbort);
signal(SIGSEGV, VGLAbort);
signal(SIGBUS, VGLAbort);
signal(SIGUSR2, SIG_IGN);
VGLOnDisplay = 1;
VGLSwitchPending = 0;
VGLAbortPending = 0;
if (ioctl(0, CONS_GET, &VGLOldMode) || ioctl(0, CONS_CURRENT, &adptype))
return -1;
@ -322,6 +331,10 @@ VGLInit(int mode)
void
VGLCheckSwitch()
{
if (VGLAbortPending) {
VGLEnd();
exit(0);
}
while (VGLSwitchPending) {
unsigned int offset;
unsigned int len;