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typedef struct siginfo
{
int si_signo; /* Signal number.*/
int si_errno; /* If non-zero, an errno value associated with this signal, as defined in <errno.h>.*/
int si_code; /* Signal code*/
union
{
int _pad[__SI_PAD_SIZE];
struct /* kill().*/
{
__pid_t si_pid; /* Sending process ID.*/
__uid_t si_uid; /* Real user ID of sending process.*/
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