Table 1 Example cases of unexplored operations that do not belong to normal execution paths. Each case exceptionally appears under specific conditions, not simple benchmarks or training. The above system calls are required to perform the required operation successfully

PostgreSQL

Memory Buffer Bloating

mremap

To resize memory space for transaction logs and caching

Nginx

Configuration Reload

lstat

To confirm and parsing the new configuration file

umask

To open log files and new sockets

getpgrp

To obtain the PGID of the old worker processes

kill

To send the SIGTERM signal to the old worker processes

Nginx

Cache Purging

unlink

To delete the old cached files

Apache Httpd

Server Reconfiguration

dup2

To duplicate the file descriptor of the dummy socket

sysinfo

To get available memory/swap space size

getpgrp

To obtain the PGID of the old worker processes

kill, tgkill

To send the SIGTERM signal to the old worker processes