Process Information


 
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# 1  
Old 08-23-2001
Error Process Information

Hi,

If we have a process p1 running and then p2 attempts to shutdown p1. Is there a means for p1 to know who has requested him to shutdown

Thanks and regards,
Reji
# 2  
Old 08-23-2001
Yes, most signal handleing routines have some form of data structure that tells you the name of the sending process. The example data structure from linux (below) from the sigaction man page provides a glimpse into how this is done in one OS:

Quote:

The siginfo_t parameter to sa_sigaction is a struct with
the following elements

siginfo_t {
int si_signo; /* Signal number */
int si_errno; /* An errno value */
int si_code; /* Signal code */
pid_t si_pid; /* Sending process ID */
uid_t si_uid; /* Real user ID of sending process */
int si_status; /* Exit value or signal */
clock_t si_utime; /* User time consumed */
clock_t si_stime; /* System time consumed */
sigval_t si_value; /* Signal value */
int si_int; /* POSIX.1b signal */
void * si_ptr; /* POSIX.1b signal */
void * si_addr; /* Memory location which caused fault */
int si_band; /* Band event */
int si_fd; /* File descriptor */
}
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