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Test Your Knowledge in Computers #663
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American computer programmer Timothy Paterson wrote the original operating system for the Intel 8086 microprocessor in 1980, initially calling it QDOS (Quick and Dirty Operating System).
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setreuid(2) [bsd man page]

SETREUID(2)							System Calls Manual						       SETREUID(2)

NAME
setreuid - set real and effective user ID's SYNOPSIS
setreuid(ruid, euid) int ruid, euid; DESCRIPTION
The real and effective user ID's of the current process are set according to the arguments. If ruid or euid is -1, the current uid is filled in by the system. Unprivileged users may change the real user ID to the effective user ID and vice-versa; only the super-user may make other changes. RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS
[EPERM] The current process is not the super-user and a change other than changing the effective user-id to the real user-id was specified. SEE ALSO
getuid(2), setregid(2), setuid(3) 4th Berkeley Distribution May 9, 1985 SETREUID(2)

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SETREUID(2)						      BSD System Calls Manual						       SETREUID(2)

NAME
setreuid -- set real and effective user IDs LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> int setreuid(uid_t ruid, uid_t euid); DESCRIPTION
The real and effective user IDs of the current process are set according to the arguments. If ruid or euid is -1, the current uid is filled in by the system. Unprivileged users may change the real user ID to the effective user ID and vice-versa; only the super-user may make other changes. The setreuid() function has been used to swap the real and effective user IDs in set-user-ID programs to temporarily relinquish the set-user- ID value. This purpose is now better served by the use of the seteuid() function (see setuid(2)). When setting the real and effective user IDs to the same value, the standard setuid() function is preferred. RETURN VALUES
The setreuid() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi- cate the error. ERRORS
[EPERM] The current process is not the super-user and a change other than changing the effective user-id to the real user-id was specified. SEE ALSO
getuid(2), issetugid(2), seteuid(2), setuid(2) HISTORY
The setreuid() system call appeared in 4.2BSD. BSD
February 8, 2001 BSD

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