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Add open64() hook for _FILE_OFFSET_BITS=64

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This commit is contained in:
Cameron Gutman 2022-09-03 18:05:03 -05:00
parent 58429f4172
commit 555a65c8ea
1 changed files with 26 additions and 13 deletions
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39
app/masterhook.c
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@ -94,20 +94,19 @@ int drmModeAtomicCommit(int fd, drmModeAtomicReqPtr req,
// hook this variant of open(), since that's what SDL uses. When we see
// the open a FD for the same card as the Qt DRM master FD, we'll drop
// master on the Qt FD to allow the new FD to have master.
int open(const char *pathname, int flags, ...)
int openHook(const char *funcname, const char *pathname, int flags, va_list va)
{
int fd;
mode_t mode;
// Call the real thing to do the open operation
if (__OPEN_NEEDS_MODE(flags)) {
va_list va;
va_start(va, flags);
mode_t mode = va_arg(va, mode_t);
fd = ((typeof(open)*)dlsym(RTLD_NEXT, "open"))(pathname, flags, mode);
va_end(va);
mode = va_arg(va, mode_t);
fd = ((typeof(open)*)dlsym(RTLD_NEXT, funcname))(pathname, flags, mode);
}
else {
fd = ((typeof(open)*)dlsym(RTLD_NEXT, "open"))(pathname, flags);
mode = 0;
fd = ((typeof(open)*)dlsym(RTLD_NEXT, funcname))(pathname, flags);
}
// If the file was successfully opened and we have a DRM master FD,
@ -140,14 +139,10 @@ int open(const char *pathname, int flags, ...)
// simply creating a new FD. Let's do it.
close(fd);
if (__OPEN_NEEDS_MODE(flags)) {
va_list va;
va_start(va, flags);
mode_t mode = va_arg(va, mode_t);
fd = ((typeof(open)*)dlsym(RTLD_NEXT, "open"))(pathname, flags, mode);
va_end(va);
fd = ((typeof(open)*)dlsym(RTLD_NEXT, funcname))(pathname, flags, mode);
}
else {
fd = ((typeof(open)*)dlsym(RTLD_NEXT, "open"))(pathname, flags);
fd = ((typeof(open)*)dlsym(RTLD_NEXT, funcname))(pathname, flags);
}
g_SdlDrmMasterFd = fd;
}
@ -157,6 +152,24 @@ int open(const char *pathname, int flags, ...)
return fd;
}
int open(const char *pathname, int flags, ...)
{
va_list va;
va_start(va, flags);
int fd = openHook("open", pathname, flags, va);
va_end(va);
return fd;
}
int open64(const char *pathname, int flags, ...)
{
va_list va;
va_start(va, flags);
int fd = openHook("open64", pathname, flags, va);
va_end(va);
return fd;
}
// Our close() hook handles restoring DRM master to the Qt FD
// after SDL closes its DRM FD.
int close(int fd)