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Random man page:
setgid(2) -- set user and group IDs
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setuid() sets the real-user-ID (ruid), effective-user-ID (euid), and/or saved-user-ID (suid) of the calling process. The super-user's euid is zero. The following conditions govern setuid's behavior: + If the euid is zero, setuid() sets the ruid, euid, and suid to uid. + If the euid is not zero, but the argument uid is equal to the ruid or the suid, setuid() sets the euid to uid; the ruid and sui... |
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