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getuid, geteuid - get user identity
#include <unistd.h> #include <sys/types.h> uid_t getuid(void); uid_t geteuid(void);
getuid() returns the real user ID of the calling process. geteuid() returns the effective user ID of the calling process.
These functions are always successful.
History In UNIX V6 the getuid() call returned (euid << 8) + uid. UNIX V7 introduced separate calls getuid() and geteuid(). The original Linux getuid() and geteuid() system calls supported only 16-bit user IDs. Subsequently, Linux 2.4 added getuid32() and geteuid32(), supporting 32-bit IDs. The glibc getuid() and geteuid() wrapper functions transparently deal with the variations across kernel versions.
getresuid(2), setreuid(2), setuid(2), credentials(7)
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