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getuid(2) [mojave man page]

GETUID(2)						      BSD System Calls Manual							 GETUID(2)

geteuid, getuid -- get user identification SYNOPSIS
#include <unistd.h> uid_t geteuid(void); uid_t getuid(void); DESCRIPTION
The getuid() function returns the real user ID of the calling process. The geteuid() function returns the effective user ID of the calling process. The real user ID is that of the user who has invoked the program. As the effective user ID gives the process additional permissions during execution of ``set-user-ID'' mode processes, getuid() is used to determine the real-user-id of the calling process. ERRORS
The getuid() and geteuid() functions are always successful, and no return value is reserved to indicate an error. LEGACY SYNOPSIS
#include <sys/types.h> #include <unistd.h> The include file <sys/types.h> is necessary for both functions. SEE ALSO
getgid(2), setreuid(2), compat(5) STANDARDS
geteuid() and getuid() functions conform to IEEE Std 1003.1-1988 (``POSIX.1''). 4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution

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GETUID(2)						     Linux Programmer's Manual							 GETUID(2)

getuid, geteuid - get user identity SYNOPSIS
#include <unistd.h> #include <sys/types.h> uid_t getuid(void); uid_t geteuid(void); DESCRIPTION
getuid() returns the real user ID of the calling process. geteuid() returns the effective user ID of the calling process. When a normal program is executed, the effective and real user ID of the process are set to the ID of the user executing the file. When a set ID program is executed the real user ID is set to the calling user and the effective user ID corresponds to the set ID bit on the file being executed. ERRORS
These functions are always successful. CONFORMING TO
POSIX.1-2001, 4.3BSD. NOTES
History In Unix V6 the getuid() call returned (euid << 8) + uid. Unix V7 introduced separate calls getuid() and geteuid(). SEE ALSO
getresuid(2), setreuid(2), setuid(2), credentials(7) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 1993-07-23 GETUID(2)

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