__pid_t
int sigqueue(__pid_t, int, const union sigval);
int killpg(__pid_t, int);
typedef __pid_t pid_t;
int kill(__pid_t, int);
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t; /* process id */
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t;
__pid_t si_pid; /* sending process */
__pid_t si_pid; /* sending process */
typedef __pid_t pid_t;
typedef __pid_t pid_t;
typedef __pid_t pid_t; /* process id */