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-rw-r--r--src/basic/missing.h7
-rw-r--r--src/basic/process-util.c2
2 files changed, 8 insertions, 1 deletions
diff --git a/src/basic/missing.h b/src/basic/missing.h
index 03b954d17..5b194261d 100644
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -1416,4 +1416,11 @@ struct statx {
#define AT_STATX_DONT_SYNC 0x4000
#endif
+/* The maximum thread/process name length including trailing NUL byte. This mimics the kernel definition of the same
+ * name, which we need in userspace at various places but is not defined in userspace currently, neither under this
+ * name nor any other. */
+#ifndef TASK_COMM_LEN
+#define TASK_COMM_LEN 16
+#endif
+
#include "missing_syscall.h"
diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index 1484a0011..f74eebd58 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -296,7 +296,7 @@ int rename_process(const char name[]) {
* can use PR_SET_NAME, which sets the thread name for the calling thread. */
if (prctl(PR_SET_NAME, name) < 0)
log_debug_errno(errno, "PR_SET_NAME failed: %m");
- if (l > 15) /* Linux process names can be 15 chars at max */
+ if (l >= TASK_COMM_LEN) /* Linux process names can be 15 chars at max */
truncated = true;
/* Second step, change glibc's ID of the process name. */