syslog: fix PID of forking process
Do not cache PID for a process that does not fabricate it,
calls openlog() before forking and does not call exec() thereafter.
PR: 268666
Fixes: e9ae9fa937
Tested by: kp
MFC after: 3 days
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@ -218,7 +218,7 @@ vsyslog1(int pri, const char *fmt, va_list ap)
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* specified, as it provides valuable information. Many
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* applications tend not to use this, even though they should.
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*/
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if (LogPid == -1)
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if (LogTagLength <= 0)
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LogPid = getpid();
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(void)fprintf(fp, "%d ", (int)LogPid);
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/* Message ID. */
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