We already use it at two places, and we are about to add one too.
Arbitrary literally hardcoded limits suck.
#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"
* 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. */
assert_se(get_process_comm(0, &comm) >= 0);
log_info("comm = <%s>", comm);
- assert_se(strneq(comm, p, 15));
+ assert_se(strneq(comm, p, TASK_COMM_LEN-1));
assert_se(get_process_cmdline(0, 0, false, &cmdline) >= 0);
/* we cannot expect cmdline to be renamed properly without privileges */