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This interface allows to obtain the associated process ID from the
process file descriptor. It is done by parsing the procps fdinfo
information. Its prototype is:
pid_t pidfd_getpid (int fd)
It returns the associated pid or -1 in case of an error and sets the
errno accordingly. The possible errno values are those from open, read,
and close (used on procps parsing), along with:
- EBADF if the FD is negative, does not have a PID associated, or if
the fdinfo fields contain a value larger than pid_t.
- EREMOTE if the PID is in a separate namespace.
- ESRCH if the process is already terminated.
Checked on x86_64-linux-gnu on Linux 4.15 (no CLONE_PIDFD or waitid
support), Linux 5.4 (full support), and Linux 6.2.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
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| .. | ||
| acct.h | ||
| epoll.h | ||
| eventfd.h | ||
| fanotify.h | ||
| fsuid.h | ||
| inotify.h | ||
| kd.h | ||
| klog.h | ||
| mount.h | ||
| pci.h | ||
| personality.h | ||
| pidfd.h | ||
| prctl.h | ||
| procfs.h | ||
| ptrace.h | ||
| quota.h | ||
| raw.h | ||
| reboot.h | ||
| rseq.h | ||
| signalfd.h | ||
| soundcard.h | ||
| swap.h | ||
| syscall.h | ||
| sysinfo.h | ||
| timerfd.h | ||
| timex.h | ||
| ttydefaults.h | ||
| user.h | ||
| vt.h | ||