The os.pidfd_open() function creates a file descriptor that refers to the ID of a process specified as PID an argument. The returned file descriptor can be used to perform process management without any external signal.
It also set
close-on-execflag on file descriptor. The set flag value means a child process does not inherit the file descriptor.
os.pidfd_open(pid, flags=0)
It takes the following argument values.
pid: This is the process identifier.flags: This is the flag argument that can have either 0 or PIDFD_NONBLOCK flag. Its default is 0.
flag= PIDFD_NONBLOCKmeans os.pidfd_open() will return a non-blocking file descriptor. The non-blocking file descriptor means returning data quickly even if file reading is slow.
It returns either a positive integer or -1.
-1.from os import fork, pidfd_open
# fork the current process
pid = fork();
# if child process is in execution
if pid > 0:
pidfd = pidfd_open(pid, 0)
print("Child Process")
else:
print("Parent Process")fork and pidpf_open methods from the os module.fork() to make a copy of the current process.pid is greater than 0, it means the child process is under execution.pidfd_open(pid, 0) is used to get the file descriptor for the current process."Child Process"."Parent Process".