/* Linux-specific PROCFS manipulation routines.
- Copyright (C) 2009-2015 Free Software Foundation, Inc.
+ Copyright (C) 2009-2017 Free Software Foundation, Inc.
This file is part of GDB.
return linux_proc_get_int (lwpid, "TracerPid", 0);
}
-/* Fill in BUFFER, a buffer with BUFFER_SIZE bytes with the 'State'
+/* Process states as discovered in the 'State' line of
+ /proc/PID/status. Not all possible states are represented here,
+ only those that we care about. */
+
+enum proc_state
+{
+ /* Some state we don't handle. */
+ PROC_STATE_UNKNOWN,
+
+ /* Stopped on a signal. */
+ PROC_STATE_STOPPED,
+
+ /* Tracing stop. */
+ PROC_STATE_TRACING_STOP,
+
+ /* Dead. */
+ PROC_STATE_DEAD,
+
+ /* Zombie. */
+ PROC_STATE_ZOMBIE,
+};
+
+/* Parse a PROC_STATE out of STATE, a buffer with the state found in
+ the 'State:' line of /proc/PID/status. */
+
+static enum proc_state
+parse_proc_status_state (const char *state)
+{
+ state = skip_spaces_const (state);
+
+ switch (state[0])
+ {
+ case 't':
+ return PROC_STATE_TRACING_STOP;
+ case 'T':
+ /* Before Linux 2.6.33, tracing stop used uppercase T. */
+ if (strcmp (state, "T (tracing stop)") == 0)
+ return PROC_STATE_TRACING_STOP;
+ else
+ return PROC_STATE_STOPPED;
+ case 'X':
+ return PROC_STATE_DEAD;
+ case 'Z':
+ return PROC_STATE_ZOMBIE;
+ }
+
+ return PROC_STATE_UNKNOWN;
+}
+
+
+/* Fill in STATE, a buffer with BUFFER_SIZE bytes with the 'State'
line of /proc/PID/status. Returns -1 on failure to open the /proc
file, 1 if the line is found, and 0 if not found. If WARN, warn on
failure to open the /proc file. */
static int
-linux_proc_pid_get_state (pid_t pid, char *buffer, size_t buffer_size,
- int warn)
+linux_proc_pid_get_state (pid_t pid, int warn, enum proc_state *state)
{
FILE *procfile;
int have_state;
+ char buffer[100];
- xsnprintf (buffer, buffer_size, "/proc/%d/status", (int) pid);
+ xsnprintf (buffer, sizeof (buffer), "/proc/%d/status", (int) pid);
procfile = gdb_fopen_cloexec (buffer, "r");
if (procfile == NULL)
{
}
have_state = 0;
- while (fgets (buffer, buffer_size, procfile) != NULL)
+ while (fgets (buffer, sizeof (buffer), procfile) != NULL)
if (startswith (buffer, "State:"))
{
have_state = 1;
+ *state = parse_proc_status_state (buffer + sizeof ("State:") - 1);
break;
}
fclose (procfile);
int
linux_proc_pid_is_gone (pid_t pid)
{
- char buffer[100];
int have_state;
+ enum proc_state state;
- have_state = linux_proc_pid_get_state (pid, buffer, sizeof buffer, 0);
+ have_state = linux_proc_pid_get_state (pid, 0, &state);
if (have_state < 0)
{
/* If we can't open the status file, assume the thread has
return 0;
}
else
- {
- return (strstr (buffer, "Z (") != NULL
- || strstr (buffer, "X (") != NULL);
- }
+ return (state == PROC_STATE_ZOMBIE || state == PROC_STATE_DEAD);
}
/* Return non-zero if 'State' of /proc/PID/status contains STATE. If
WARN, warn on failure to open the /proc file. */
static int
-linux_proc_pid_has_state (pid_t pid, const char *state, int warn)
+linux_proc_pid_has_state (pid_t pid, enum proc_state state, int warn)
{
- char buffer[100];
int have_state;
+ enum proc_state cur_state;
- have_state = linux_proc_pid_get_state (pid, buffer, sizeof buffer, warn);
- return (have_state > 0 && strstr (buffer, state) != NULL);
+ have_state = linux_proc_pid_get_state (pid, warn, &cur_state);
+ return (have_state > 0 && cur_state == state);
}
/* Detect `T (stopped)' in `/proc/PID/status'.
int
linux_proc_pid_is_stopped (pid_t pid)
{
- return linux_proc_pid_has_state (pid, "T (stopped)", 1);
+ return linux_proc_pid_has_state (pid, PROC_STATE_STOPPED, 1);
}
-/* Detect `T (tracing stop)' in `/proc/PID/status'.
+/* Detect `t (tracing stop)' in `/proc/PID/status'.
Other states including `T (stopped)' are reported as false. */
int
linux_proc_pid_is_trace_stopped_nowarn (pid_t pid)
{
- return linux_proc_pid_has_state (pid, "T (tracing stop)", 1);
+ return linux_proc_pid_has_state (pid, PROC_STATE_TRACING_STOP, 1);
}
/* Return non-zero if PID is a zombie. If WARN, warn on failure to
static int
linux_proc_pid_is_zombie_maybe_warn (pid_t pid, int warn)
{
- return linux_proc_pid_has_state (pid, "Z (zombie)", warn);
+ return linux_proc_pid_has_state (pid, PROC_STATE_ZOMBIE, warn);
}
/* See linux-procfs.h declaration. */
return linux_proc_pid_is_zombie_maybe_warn (pid, 1);
}
-/* See linux-procfs.h declaration. */
+/* See linux-procfs.h. */
-char *
-linux_proc_pid_get_ns (pid_t pid, const char *ns)
+const char *
+linux_proc_tid_get_name (ptid_t ptid)
{
- char buf[100];
- char nsval[64];
- int ret;
- xsnprintf (buf, sizeof (buf), "/proc/%d/ns/%s", (int) pid, ns);
- ret = readlink (buf, nsval, sizeof (nsval));
- if (0 < ret && ret < sizeof (nsval))
+#define TASK_COMM_LEN 16 /* As defined in the kernel's sched.h. */
+
+ static char comm_buf[TASK_COMM_LEN];
+ char comm_path[100];
+ FILE *comm_file;
+ const char *comm_val;
+ pid_t pid = ptid_get_pid (ptid);
+ pid_t tid = ptid_lwp_p (ptid) ? ptid_get_lwp (ptid) : ptid_get_pid (ptid);
+
+ xsnprintf (comm_path, sizeof (comm_path),
+ "/proc/%ld/task/%ld/comm", (long) pid, (long) tid);
+
+ comm_file = gdb_fopen_cloexec (comm_path, "r");
+ if (comm_file == NULL)
+ return NULL;
+
+ comm_val = fgets (comm_buf, sizeof (comm_buf), comm_file);
+ fclose (comm_file);
+
+ if (comm_val != NULL)
{
- nsval[ret] = '\0';
- return xstrdup (nsval);
+ int i;
+
+ /* Make sure there is no newline at the end. */
+ for (i = 0; i < sizeof (comm_buf); i++)
+ {
+ if (comm_buf[i] == '\n')
+ {
+ comm_buf[i] = '\0';
+ break;
+ }
+ }
}
- return NULL;
+ return comm_val;
}
/* See linux-procfs.h. */
projects / deliverable / binutils-gdb.git / blobdiff