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49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/*
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* Lock and unlock a mutex with a globally visible name. Used to
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* synchronise between unrelated processes, such as two
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* connection-sharing PuTTYs deciding which will be the upstream.
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*/
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#include "putty.h"
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#include "security-api.h"
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HANDLE lock_interprocess_mutex(const char *mutexname, char **error)
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{
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PSECURITY_DESCRIPTOR psd = NULL;
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PACL acl = NULL;
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HANDLE mutex = NULL;
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if (!make_private_security_descriptor(MUTEX_ALL_ACCESS,
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&psd, &acl, error))
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goto out;
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SECURITY_ATTRIBUTES sa;
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memset(&sa, 0, sizeof(sa));
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sa.nLength = sizeof(sa);
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sa.lpSecurityDescriptor = psd;
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sa.bInheritHandle = false;
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mutex = CreateMutex(&sa, false, mutexname);
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if (!mutex) {
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*error = dupprintf("CreateMutex(\"%s\") failed: %s",
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mutexname, win_strerror(GetLastError()));
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goto out;
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}
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WaitForSingleObject(mutex, INFINITE);
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out:
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if (psd)
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LocalFree(psd);
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if (acl)
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LocalFree(acl);
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return mutex;
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}
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void unlock_interprocess_mutex(HANDLE mutex)
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{
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ReleaseMutex(mutex);
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CloseHandle(mutex);
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}
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