io/linux/ProcCgroup: ReadPidfdPid() returns signed integer

The "Pid" line is -1 if the process has already exited and has been reaped.
CM4all · Nov 23, 2024 · 8529845 · 8529845
1 parent 268c2e9
commit 8529845
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Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/src/io/linux/ProcFdinfo.cxx b/src/io/linux/ProcFdinfo.cxx
@@ -14,7 +14,7 @@
 
 using std::string_view_literals::operator""sv;
 
-unsigned
+int
 ReadPidfdPid(FileDescriptor pidfd)
 {
 	assert(pidfd.IsDefined());

diff --git a/src/io/linux/ProcFdinfo.hxx b/src/io/linux/ProcFdinfo.hxx
@@ -11,6 +11,9 @@ class FileDescriptor;
  * line in /proc/self/fdinfo/PIDFD.
  *
  * Throws on error.
+ *
+ * @return the PID (or -1 if the process has already exited and has
+ * been reaped)
  */
-unsigned
+int
 ReadPidfdPid(FileDescriptor pidfd);