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1. UNIX for Advanced & Expert Users
Was recently working on an requirement where we have to search files more than a specific number, following is the example on same.
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Despite the exec man page, the exec system call seems to turn my effective-user-id into my real-user-id.
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Can anyone explain me in details of Real and Effective IDs (6 Replies)
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I would like to give execution rights for a script to one user. (that's the easy part...)
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Discussion started by: hilmel
setreuid(2) System Calls Manual setreuid(2)
setreuid - set real and effective user IDs
The function sets the real and effective user IDs of the current process to the values specified by the ruid and euid arguments. If ruid or
euid is -1, the corresponding effective or real user ID of the current process is left unchanged.
A process with appropriate privileges can set either ID to any value. An unprivileged process can only set the effective user ID if the
euid argument is equal to either the real, effective, or saved user ID of the process.
It is unspecified whether a process without appropriate privileges is permitted to change the real user ID to match the current real,
effective or saved user ID of the process.
Upon successful completion, 0 is returned. Otherwise, -1 is returned and is set to indicate the error.
The function will fail if:
[EINVAL] The value of the ruid or euid argument is invalid or out-of-range.
[EPERM] The current process does not have appropriate privileges, and either an attempt was made to change the
effective user ID to a value other than the real user ID or the saved set-user-ID or an attempt was made to
change the real user ID to a value not permitted by the implementation.
getuid(2), setuid(2), <unistd.h>.
First released in Issue 4, Version 2.