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FileSystem: Fix POSIXLock positioning

This commit is contained in:
Stenzek 2023-01-30 18:00:16 +10:00
parent 39d1e899eb
commit a3c7449749
1 changed files with 29 additions and 17 deletions
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46
src/common/file_system.cpp
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@ -1917,36 +1917,48 @@ bool FileSystem::SetPathCompression(const char* path, bool enable)
return false;
}
FileSystem::POSIXLock::POSIXLock(int fd)
static bool SetLock(int fd, bool lock)
{
if (lockf(fd, F_LOCK, 0) == 0)
// We want to lock the whole file.
const off_t offs = lseek(fd, 0, SEEK_CUR);
if (offs < 0)
{
m_fd = fd;
Log_ErrorPrintf("lseek(%d) failed: %d", fd, errno);
return false;
}
else
if (offs != 0 && lseek(fd, 0, SEEK_SET) < 0)
{
Log_ErrorPrintf("lockf() failed: %d", errno);
m_fd = -1;
Log_ErrorPrintf("lseek(%d, 0) failed: %d", fd, errno);
return false;
}
const bool res = (lockf(fd, lock ? F_LOCK : F_ULOCK, 0) == 0);
if (lseek(fd, offs, SEEK_SET) < 0)
Panic("Repositioning file descriptor after lock failed.");
if (!res)
Log_ErrorPrintf("lockf() for %s failed: %d", lock ? "lock" : "unlock", errno);
return res;
}
FileSystem::POSIXLock::POSIXLock(std::FILE* fp)
FileSystem::POSIXLock::POSIXLock(int fd) : m_fd(fd)
{
m_fd = fileno(fp);
if (m_fd >= 0)
{
if (lockf(m_fd, F_LOCK, 0) != 0)
{
Log_ErrorPrintf("lockf() failed: %d", errno);
m_fd = -1;
}
}
if (!SetLock(m_fd, true))
m_fd = -1;
}
FileSystem::POSIXLock::POSIXLock(std::FILE* fp) : m_fd(fileno(fp))
{
if (!SetLock(m_fd, true))
m_fd = -1;
}
FileSystem::POSIXLock::~POSIXLock()
{
if (m_fd >= 0)
lockf(m_fd, F_ULOCK, m_fd);
SetLock(m_fd, false);
}
#endif