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Add proc traversal debugging for tracking down ARM 64 asm bugs in tuxreaperd
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mrkmntal 2026-08-29 14:26:26 -04:00
commit aa13a20cb0
1 changed files with 40 additions and 0 deletions
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40
tuxreaperdasm.c
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@ -668,6 +668,11 @@ static long parse_pid(const char *s) {
Skip PID 1 (the reaper itself). */
static void proc_remap_signal(int in_sig, int out_sig, const char *const *target_exes) {
int procfd = (int)sys_openat(AT_FDCWD, "/proc", O_RDONLY | O_DIRECTORY, 0);
#ifdef TUXREAPERD_DEBUG
debug_write("[tuxreaperd] proc_remap_signal openat fd=");
debug_write_int(procfd);
debug_write("\n");
#endif
if (procfd < 0) {
debug_msg("opendir(/proc) failed");
return;
@ -677,6 +682,11 @@ static void proc_remap_signal(int in_sig, int out_sig, const char *const *target
for (;;) {
long n = sys_getdents64(procfd, dirbuf, sizeof(dirbuf));
#ifdef TUXREAPERD_DEBUG
debug_write("[tuxreaperd] proc_remap getdents64 n=");
debug_write_int(n);
debug_write("\n");
#endif
if (n <= 0) break;
for (long pos = 0; pos < n;) {
@ -701,6 +711,15 @@ static void proc_remap_signal(int in_sig, int out_sig, const char *const *target
char linkbuf[256];
long linklen = sys_readlink(path, linkbuf, sizeof(linkbuf) - 1);
#ifdef TUXREAPERD_DEBUG
debug_write("[tuxreaperd] proc_remap pid=");
debug_write_int(pid);
debug_write(" path=");
debug_write(path);
debug_write(" linklen=");
debug_write_int(linklen);
debug_write("\n");
#endif
if (linklen <= 0) continue;
linkbuf[linklen] = '\0';
@ -754,6 +773,13 @@ static void broadcast_signal(int in_sig, int out_sig, const char *const *target_
static int count_descendants(void) {
int procfd = (int)sys_openat(AT_FDCWD, "/proc", O_RDONLY | O_DIRECTORY, 0);
#ifdef TUXREAPERD_DEBUG
debug_write("[tuxreaperd] count_descendants openat fd=");
debug_write_int(procfd);
debug_write(" flags=0x");
debug_write_int(O_RDONLY | O_DIRECTORY);
debug_write("\n");
#endif
if (procfd < 0) return 0;
int count = 0;
@ -761,6 +787,11 @@ static int count_descendants(void) {
for (;;) {
long n = sys_getdents64(procfd, dirbuf, sizeof(dirbuf));
#ifdef TUXREAPERD_DEBUG
debug_write("[tuxreaperd] getdents64 n=");
debug_write_int(n);
debug_write("\n");
#endif
if (n <= 0) break;
for (long pos = 0; pos < n;) {
@ -768,6 +799,15 @@ static int count_descendants(void) {
pos += de->d_reclen;
const char *name = de->d_name;
#ifdef TUXREAPERD_DEBUG
debug_write("[tuxreaperd] dirent name=");
debug_write(name);
debug_write(" reclen=");
debug_write_int(de->d_reclen);
debug_write(" d_type=");
debug_write_int(de->d_type);
debug_write("\n");
#endif
if (name[0] == '.') continue;
long pid = parse_pid(name);