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#include <unistd.h>
pid_t getpid(void);
/* Returns: process ID of calling process */
pid_t getppid(void);
/* Returns: parent process ID of calling process */
uid_t getuid(void);
/* Returns: real user ID of calling process */
uid_t geteuid(void);
/* Returns: effective user ID of calling process */
gid_t getgid(void);
/* Returns: real group ID of calling process */
gid_t getegid(void);
/* Returns: effective group ID of calling process */
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