| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
POSIX.1 |
both |
#define _POSIX_SOURCE
#include <unistd.h>
uid_t getuid(void);Finds the real user ID (UID) of the calling process.
getuid() returns the found value. It is always successful.
There are no documented errno values.
⁄* CELEBG20
This example provides information for your user ID.
*⁄
#define _POSIX_SOURCE
#include <pwd.h>
#include <sys⁄types.h>
#include <unistd.h>
main() {
struct passwd *p;
uid_t uid;
if ((p = getpwuid(uid = getuid())) == NULL)
perror("getpwuid() error");
else {
puts("getpwuid() returned the following info for your userid:");
printf(" pw_name : %s\n", p->pw_name);
printf(" pw_uid : %d\n", (int) p->pw_uid);
printf(" pw_gid : %d\n", (int) p->pw_gid);
printf(" pw_dir : %s\n", p->pw_dir);
printf(" pw_shell : %s\n", p->pw_shell);
}
}
pw_name : MVSUSR1
pw_uid : 25
pw_gid : 500
pw_dir : /u/mvsusr1
pw_shell : /bin/sh