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linux: Add pidfd_getpid

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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>
This commit is contained in:
Adhemerval Zanella Netto
2023-08-24 13:42:19 -03:00
committed by Adhemerval Zanella
parent 0d6f9f6265
commit e7190fc73d
44 changed files with 520 additions and 0 deletions
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4
sysdeps/unix/sysv/linux/sys/pidfd.h
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@@ -46,4 +46,8 @@ extern int pidfd_getfd (int __pidfd, int __targetfd,
extern int pidfd_send_signal (int __pidfd, int __sig, siginfo_t *__info,
unsigned int __flags) __THROW;
/* Query the process ID (PID) from process descriptor FD. Return the PID
or -1 in case of an error. */
extern pid_t pidfd_getpid (int __fd) __THROW;
#endif /* _PIDFD_H */