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9f519faf80
This is consistent with the POSIX verdict that kill() shall not report
ESRCH for a zombie process. Back-patch to 9.0 (all supported versions).
Test code from commit d7cdf6ee36 depends
on it, and log messages about kill() reporting "Invalid argument" will
cease to appear for this not-unexpected condition.
78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* kill.c
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* kill()
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*
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* Copyright (c) 1996-2013, PostgreSQL Global Development Group
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*
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* This is a replacement version of kill for Win32 which sends
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* signals that the backend can recognize.
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*
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* IDENTIFICATION
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* src/port/kill.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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#ifdef WIN32
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/* signal sending */
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int
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pgkill(int pid, int sig)
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{
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char pipename[128];
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BYTE sigData = sig;
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BYTE sigRet = 0;
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DWORD bytes;
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/* we allow signal 0 here, but it will be ignored in pg_queue_signal */
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if (sig >= PG_SIGNAL_COUNT || sig < 0)
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{
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errno = EINVAL;
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return -1;
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}
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if (pid <= 0)
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{
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/* No support for process groups */
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errno = EINVAL;
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return -1;
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}
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snprintf(pipename, sizeof(pipename), "\\\\.\\pipe\\pgsignal_%u", pid);
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if (CallNamedPipe(pipename, &sigData, 1, &sigRet, 1, &bytes, 1000))
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{
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if (bytes != 1 || sigRet != sig)
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{
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errno = ESRCH;
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return -1;
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}
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return 0;
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}
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switch (GetLastError())
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{
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case ERROR_BROKEN_PIPE:
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case ERROR_BAD_PIPE:
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/*
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* These arise transiently as a process is exiting. Treat them
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* like POSIX treats a zombie process, reporting success.
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*/
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return 0;
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case ERROR_FILE_NOT_FOUND:
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/* pipe fully gone, so treat the process as gone */
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errno = ESRCH;
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return -1;
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case ERROR_ACCESS_DENIED:
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errno = EPERM;
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return -1;
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default:
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errno = EINVAL; /* unexpected */
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return -1;
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}
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}
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#endif
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