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由 Daniel P. Berrange 提交于
In some cases the caller of virPidFileRead might like extra checks to determine whether the pid just read is really the one they are expecting. This adds virPidFileReadIfAlive which will check whether the pid is still alive with kill(0, -1), and (on linux only) will look at /proc/$PID/path * libvirt_private.syms, util/virpidfile.c, util/virpidfile.h: Add virPidFileReadIfValid and virPidFileReadPathIfValid * network/bridge_driver.c: Use new APIs to check PID validity
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