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由 Laine Stump 提交于
Rather than treating uid:gid of 0:0 as a NOP, we blindly pass that through to the lower layers. However, we *do* check for a requested value of "-1" to mean "don't change this setting". setregid() and setreuid() already interpret -1 as a NOP, so this is just an optimization, but we are also calling getpwuid_r and initgroups, and it's unclear what the former would do with a uid of -1.
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