[thirdparty/systemd.git] / src / shared / process-util.c

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <stdbool.h>
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <sys/wait.h>
#include <signal.h>
#include <ctype.h>

#include "process-util.h"
#include "fileio.h"
#include "util.h"
#include "log.h"

int get_process_state(pid_t pid) {
        const char *p;
        char state;
        int r;
        _cleanup_free_ char *line = NULL;

        assert(pid >= 0);

        p = procfs_file_alloca(pid, "stat");
        r = read_one_line_file(p, &line);
        if (r < 0)
                return r;

        p = strrchr(line, ')');
        if (!p)
                return -EIO;

        p++;

        if (sscanf(p, " %c", &state) != 1)
                return -EIO;

        return (unsigned char) state;
}

int get_process_comm(pid_t pid, char **name) {
        const char *p;
        int r;

        assert(name);
        assert(pid >= 0);

        p = procfs_file_alloca(pid, "comm");

        r = read_one_line_file(p, name);
        if (r == -ENOENT)
                return -ESRCH;

        return r;
}

int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
        _cleanup_fclose_ FILE *f = NULL;
        char *r = NULL, *k;
        const char *p;
        int c;

        assert(line);
        assert(pid >= 0);

        p = procfs_file_alloca(pid, "cmdline");

        f = fopen(p, "re");
        if (!f)
                return -errno;

        if (max_length == 0) {
                size_t len = 0, allocated = 0;

                while ((c = getc(f)) != EOF) {

                        if (!GREEDY_REALLOC(r, allocated, len+2)) {
                                free(r);
                                return -ENOMEM;
                        }

                        r[len++] = isprint(c) ? c : ' ';
                }

                if (len > 0)
                        r[len-1] = 0;

        } else {
                bool space = false;
                size_t left;

                r = new(char, max_length);
                if (!r)
                        return -ENOMEM;

                k = r;
                left = max_length;
                while ((c = getc(f)) != EOF) {

                        if (isprint(c)) {
                                if (space) {
                                        if (left <= 4)
                                                break;

                                        *(k++) = ' ';
                                        left--;
                                        space = false;
                                }

                                if (left <= 4)
                                        break;

                                *(k++) = (char) c;
                                left--;
                        }  else
                                space = true;
                }

                if (left <= 4) {
                        size_t n = MIN(left-1, 3U);
                        memcpy(k, "...", n);
                        k[n] = 0;
                } else
                        *k = 0;
        }

        /* Kernel threads have no argv[] */
        if (isempty(r)) {
                _cleanup_free_ char *t = NULL;
                int h;

                free(r);

                if (!comm_fallback)
                        return -ENOENT;

                h = get_process_comm(pid, &t);
                if (h < 0)
                        return h;

                r = strjoin("[", t, "]", NULL);
                if (!r)
                        return -ENOMEM;
        }

        *line = r;
        return 0;
}

int is_kernel_thread(pid_t pid) {
        const char *p;
        size_t count;
        char c;
        bool eof;
        FILE *f;

        if (pid == 0)
                return 0;

        assert(pid > 0);

        p = procfs_file_alloca(pid, "cmdline");
        f = fopen(p, "re");
        if (!f)
                return -errno;

        count = fread(&c, 1, 1, f);
        eof = feof(f);
        fclose(f);

        /* Kernel threads have an empty cmdline */

        if (count <= 0)
                return eof ? 1 : -errno;

        return 0;
}

int get_process_capeff(pid_t pid, char **capeff) {
        const char *p;

        assert(capeff);
        assert(pid >= 0);

        p = procfs_file_alloca(pid, "status");

        return get_status_field(p, "\nCapEff:", capeff);
}

static int get_process_link_contents(const char *proc_file, char **name) {
        int r;

        assert(proc_file);
        assert(name);

        r = readlink_malloc(proc_file, name);
        if (r < 0)
                return r == -ENOENT ? -ESRCH : r;

        return 0;
}

int get_process_exe(pid_t pid, char **name) {
        const char *p;
        char *d;
        int r;

        assert(pid >= 0);

        p = procfs_file_alloca(pid, "exe");
        r = get_process_link_contents(p, name);
        if (r < 0)
                return r;

        d = endswith(*name, " (deleted)");
        if (d)
                *d = '\0';

        return 0;
}

static int get_process_id(pid_t pid, const char *field, uid_t *uid) {
        _cleanup_fclose_ FILE *f = NULL;
        char line[LINE_MAX];
        const char *p;

        assert(field);
        assert(uid);

        if (pid == 0)
                return getuid();

        p = procfs_file_alloca(pid, "status");
        f = fopen(p, "re");
        if (!f)
                return -errno;

        FOREACH_LINE(line, f, return -errno) {
                char *l;

                l = strstrip(line);

                if (startswith(l, field)) {
                        l += strlen(field);
                        l += strspn(l, WHITESPACE);

                        l[strcspn(l, WHITESPACE)] = 0;

                        return parse_uid(l, uid);
                }
        }

        return -EIO;
}

int get_process_uid(pid_t pid, uid_t *uid) {
        return get_process_id(pid, "Uid:", uid);
}

int get_process_gid(pid_t pid, gid_t *gid) {
        assert_cc(sizeof(uid_t) == sizeof(gid_t));
        return get_process_id(pid, "Gid:", gid);
}

int get_process_cwd(pid_t pid, char **cwd) {
        const char *p;

        assert(pid >= 0);

        p = procfs_file_alloca(pid, "cwd");

        return get_process_link_contents(p, cwd);
}

int get_process_root(pid_t pid, char **root) {
        const char *p;

        assert(pid >= 0);

        p = procfs_file_alloca(pid, "root");

        return get_process_link_contents(p, root);
}

int get_process_environ(pid_t pid, char **env) {
        _cleanup_fclose_ FILE *f = NULL;
        _cleanup_free_ char *outcome = NULL;
        int c;
        const char *p;
        size_t allocated = 0, sz = 0;

        assert(pid >= 0);
        assert(env);

        p = procfs_file_alloca(pid, "environ");

        f = fopen(p, "re");
        if (!f)
                return -errno;

        while ((c = fgetc(f)) != EOF) {
                if (!GREEDY_REALLOC(outcome, allocated, sz + 5))
                        return -ENOMEM;

                if (c == '\0')
                        outcome[sz++] = '\n';
                else
                        sz += cescape_char(c, outcome + sz);
        }

        outcome[sz] = '\0';
        *env = outcome;
        outcome = NULL;

        return 0;
}

int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
        int r;
        _cleanup_free_ char *line = NULL;
        long unsigned ppid;
        const char *p;

        assert(pid >= 0);
        assert(_ppid);

        if (pid == 0) {
                *_ppid = getppid();
                return 0;
        }

        p = procfs_file_alloca(pid, "stat");
        r = read_one_line_file(p, &line);
        if (r < 0)
                return r;

        /* Let's skip the pid and comm fields. The latter is enclosed
         * in () but does not escape any () in its value, so let's
         * skip over it manually */

        p = strrchr(line, ')');
        if (!p)
                return -EIO;

        p++;

        if (sscanf(p, " "
                   "%*c "  /* state */
                   "%lu ", /* ppid */
                   &ppid) != 1)
                return -EIO;

        if ((long unsigned) (pid_t) ppid != ppid)
                return -ERANGE;

        *_ppid = (pid_t) ppid;

        return 0;
}

int wait_for_terminate(pid_t pid, siginfo_t *status) {
        siginfo_t dummy;

        assert(pid >= 1);

        if (!status)
                status = &dummy;

        for (;;) {
                zero(*status);

                if (waitid(P_PID, pid, status, WEXITED) < 0) {

                        if (errno == EINTR)
                                continue;

                        return -errno;
                }

                return 0;
        }
}

/*
 * Return values:
 * < 0 : wait_for_terminate() failed to get the state of the
 *       process, the process was terminated by a signal, or
 *       failed for an unknown reason.
 * >=0 : The process terminated normally, and its exit code is
 *       returned.
 *
 * That is, success is indicated by a return value of zero, and an
 * error is indicated by a non-zero value.
 *
 * A warning is emitted if the process terminates abnormally,
 * and also if it returns non-zero unless check_exit_code is true.
 */
int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) {
        int r;
        siginfo_t status;

        assert(name);
        assert(pid > 1);

        r = wait_for_terminate(pid, &status);
        if (r < 0)
                return log_warning_errno(r, "Failed to wait for %s: %m", name);

        if (status.si_code == CLD_EXITED) {
                if (status.si_status != 0)
                        log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG,
                                 "%s failed with error code %i.", name, status.si_status);
                else
                        log_debug("%s succeeded.", name);

                return status.si_status;
        } else if (status.si_code == CLD_KILLED ||
                   status.si_code == CLD_DUMPED) {

                log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
                return -EPROTO;
        }

        log_warning("%s failed due to unknown reason.", name);
        return -EPROTO;
}

int kill_and_sigcont(pid_t pid, int sig) {
        int r;

        r = kill(pid, sig) < 0 ? -errno : 0;

        if (r >= 0)
                kill(pid, SIGCONT);

        return r;
}

int getenv_for_pid(pid_t pid, const char *field, char **_value) {
        _cleanup_fclose_ FILE *f = NULL;
        char *value = NULL;
        int r;
        bool done = false;
        size_t l;
        const char *path;

        assert(pid >= 0);
        assert(field);
        assert(_value);

        path = procfs_file_alloca(pid, "environ");

        f = fopen(path, "re");
        if (!f)
                return -errno;

        l = strlen(field);
        r = 0;

        do {
                char line[LINE_MAX];
                unsigned i;

                for (i = 0; i < sizeof(line)-1; i++) {
                        int c;

                        c = getc(f);
                        if (_unlikely_(c == EOF)) {
                                done = true;
                                break;
                        } else if (c == 0)
                                break;

                        line[i] = c;
                }
                line[i] = 0;

                if (memcmp(line, field, l) == 0 && line[l] == '=') {
                        value = strdup(line + l + 1);
                        if (!value)
                                return -ENOMEM;

                        r = 1;
                        break;
                }

        } while (!done);

        *_value = value;
        return r;
}

bool pid_is_unwaited(pid_t pid) {
        /* Checks whether a PID is still valid at all, including a zombie */

        if (pid <= 0)
                return false;

        if (kill(pid, 0) >= 0)
                return true;

        return errno != ESRCH;
}

bool pid_is_alive(pid_t pid) {
        int r;

        /* Checks whether a PID is still valid and not a zombie */

        if (pid <= 0)
                return false;

        r = get_process_state(pid);
        if (r == -ENOENT || r == 'Z')
                return false;

        return true;
}
Commit	Line	Data
0b452006 RC	1	/***
	2	This file is part of systemd.
	3
	4	Copyright 2010 Lennart Poettering
	5
	6	systemd is free software; you can redistribute it and/or modify it
	7	under the terms of the GNU Lesser General Public License as published by
	8	the Free Software Foundation; either version 2.1 of the License, or
	9	(at your option) any later version.
	10
	11	systemd is distributed in the hope that it will be useful, but
	12	WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Lesser General Public License for more details.
	15
	16	You should have received a copy of the GNU Lesser General Public License
	17	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	18	***/
	19
	20	#include <stdbool.h>
	21	#include <sys/types.h>
	22	#include <string.h>
	23	#include <stdio.h>
	24	#include <assert.h>
	25	#include <errno.h>
	26	#include <unistd.h>
	27	#include <sys/wait.h>
	28	#include <signal.h>
	29	#include <ctype.h>
	30
	31	#include "process-util.h"
	32	#include "fileio.h"
	33	#include "util.h"
	34	#include "log.h"
	35
	36	int get_process_state(pid_t pid) {
	37	const char *p;
	38	char state;
	39	int r;
	40	_cleanup_free_ char *line = NULL;
	41
	42	assert(pid >= 0);
	43
	44	p = procfs_file_alloca(pid, "stat");
	45	r = read_one_line_file(p, &line);
	46	if (r < 0)
	47	return r;
	48
	49	p = strrchr(line, ')');
	50	if (!p)
	51	return -EIO;
	52
	53	p++;
	54
	55	if (sscanf(p, " %c", &state) != 1)
	56	return -EIO;
	57
	58	return (unsigned char) state;
	59	}
	60
	61	int get_process_comm(pid_t pid, char **name) {
	62	const char *p;
	63	int r;
	64
65	assert(name);
66	assert(pid >= 0);
67
68	p = procfs_file_alloca(pid, "comm");
69
70	r = read_one_line_file(p, name);
71	if (r == -ENOENT)
72	return -ESRCH;
73
74	return r;
75	}
76
77	int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
78	_cleanup_fclose_ FILE *f = NULL;
79	char r = NULL, k;
80	const char *p;
81	int c;
82
83	assert(line);
84	assert(pid >= 0);
85
86	p = procfs_file_alloca(pid, "cmdline");
87
88	f = fopen(p, "re");
89	if (!f)
90	return -errno;
91
92	if (max_length == 0) {
93	size_t len = 0, allocated = 0;
94
95	while ((c = getc(f)) != EOF) {
96
97	if (!GREEDY_REALLOC(r, allocated, len+2)) {
98	free(r);
99	return -ENOMEM;
100	}
101
102	r[len++] = isprint(c) ? c : ' ';
103	}
104
105	if (len > 0)
106	r[len-1] = 0;
107
108	} else {
109	bool space = false;
110	size_t left;
111
112	r = new(char, max_length);
113	if (!r)
114	return -ENOMEM;
115
116	k = r;
117	left = max_length;
118	while ((c = getc(f)) != EOF) {
119
120	if (isprint(c)) {
121	if (space) {
122	if (left <= 4)
123	break;
124
125	*(k++) = ' ';
126	left--;
127	space = false;
128	}
129
130	if (left <= 4)
131	break;
132
133	*(k++) = (char) c;
134	left--;
135	} else
136	space = true;
137	}
138
139	if (left <= 4) {
140	size_t n = MIN(left-1, 3U);
141	memcpy(k, "...", n);
142	k[n] = 0;
143	} else
144	*k = 0;
145	}
146
147	/* Kernel threads have no argv[] */
148	if (isempty(r)) {
149	_cleanup_free_ char *t = NULL;
150	int h;
151
152	free(r);
153
154	if (!comm_fallback)
155	return -ENOENT;
156
157	h = get_process_comm(pid, &t);
158	if (h < 0)
159	return h;
160
161	r = strjoin("[", t, "]", NULL);
162	if (!r)
163	return -ENOMEM;
164	}
165
166	*line = r;
167	return 0;
168	}
169
170	int is_kernel_thread(pid_t pid) {
171	const char *p;
172	size_t count;
173	char c;
174	bool eof;
175	FILE *f;
176
177	if (pid == 0)
178	return 0;
179
180	assert(pid > 0);
181
182	p = procfs_file_alloca(pid, "cmdline");
183	f = fopen(p, "re");
184	if (!f)
185	return -errno;
186
187	count = fread(&c, 1, 1, f);
188	eof = feof(f);
189	fclose(f);
190
191	/* Kernel threads have an empty cmdline */
192
193	if (count <= 0)
194	return eof ? 1 : -errno;
195
196	return 0;
197	}
198
199	int get_process_capeff(pid_t pid, char **capeff) {
200	const char *p;
201
202	assert(capeff);
203	assert(pid >= 0);
204
205	p = procfs_file_alloca(pid, "status");
206
207	return get_status_field(p, "\nCapEff:", capeff);
208	}
209
210	static int get_process_link_contents(const char proc_file, char *name) {
211	int r;
212
213	assert(proc_file);
214	assert(name);
215
216	r = readlink_malloc(proc_file, name);
217	if (r < 0)
218	return r == -ENOENT ? -ESRCH : r;
219
220	return 0;
221	}
222
223	int get_process_exe(pid_t pid, char **name) {
224	const char *p;
225	char *d;
226	int r;
227
228	assert(pid >= 0);
229
230	p = procfs_file_alloca(pid, "exe");
231	r = get_process_link_contents(p, name);
232	if (r < 0)
233	return r;
234
235	d = endswith(*name, " (deleted)");
236	if (d)
237	*d = '\0';
238
239	return 0;
240	}
241
242	static int get_process_id(pid_t pid, const char field, uid_t uid) {
243	_cleanup_fclose_ FILE *f = NULL;
244	char line[LINE_MAX];
245	const char *p;
246
247	assert(field);
248	assert(uid);
249
250	if (pid == 0)
251	return getuid();
252
253	p = procfs_file_alloca(pid, "status");
254	f = fopen(p, "re");
255	if (!f)
256	return -errno;
257
258	FOREACH_LINE(line, f, return -errno) {
259	char *l;
260
261	l = strstrip(line);
262
263	if (startswith(l, field)) {
264	l += strlen(field);
265	l += strspn(l, WHITESPACE);
266
267	l[strcspn(l, WHITESPACE)] = 0;
268
269	return parse_uid(l, uid);
270	}
271	}
272
273	return -EIO;
274	}
275
276	int get_process_uid(pid_t pid, uid_t *uid) {
277	return get_process_id(pid, "Uid:", uid);
278	}
279
280	int get_process_gid(pid_t pid, gid_t *gid) {
281	assert_cc(sizeof(uid_t) == sizeof(gid_t));
282	return get_process_id(pid, "Gid:", gid);
283	}
284
285	int get_process_cwd(pid_t pid, char **cwd) {
286	const char *p;
287
288	assert(pid >= 0);
289
290	p = procfs_file_alloca(pid, "cwd");
291
292	return get_process_link_contents(p, cwd);
293	}
294
295	int get_process_root(pid_t pid, char **root) {
296	const char *p;
297
298	assert(pid >= 0);
299
300	p = procfs_file_alloca(pid, "root");
301
302	return get_process_link_contents(p, root);
303	}
304
305	int get_process_environ(pid_t pid, char **env) {
306	_cleanup_fclose_ FILE *f = NULL;
307	_cleanup_free_ char *outcome = NULL;
308	int c;
309	const char *p;
310	size_t allocated = 0, sz = 0;
311
312	assert(pid >= 0);
313	assert(env);
314
315	p = procfs_file_alloca(pid, "environ");
316
317	f = fopen(p, "re");
318	if (!f)
319	return -errno;
320
321	while ((c = fgetc(f)) != EOF) {
322	if (!GREEDY_REALLOC(outcome, allocated, sz + 5))
323	return -ENOMEM;
324
325	if (c == '\0')
326	outcome[sz++] = '\n';
327	else
328	sz += cescape_char(c, outcome + sz);
329	}
330
331	outcome[sz] = '\0';
332	*env = outcome;
333	outcome = NULL;
334
335	return 0;
336	}
337
338	int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
339	int r;
340	_cleanup_free_ char *line = NULL;
341	long unsigned ppid;
342	const char *p;
343
344	assert(pid >= 0);
345	assert(_ppid);
346
347	if (pid == 0) {
348	*_ppid = getppid();
349	return 0;
350	}
351
352	p = procfs_file_alloca(pid, "stat");
353	r = read_one_line_file(p, &line);
354	if (r < 0)
355	return r;
356
357	/* Let's skip the pid and comm fields. The latter is enclosed
358	* in () but does not escape any () in its value, so let's
359	* skip over it manually */
360
361	p = strrchr(line, ')');
362	if (!p)
363	return -EIO;
364
365	p++;
366
367	if (sscanf(p, " "
368	"%c " / state */
369	"%lu ", /* ppid */
370	&ppid) != 1)
371	return -EIO;
372
373	if ((long unsigned) (pid_t) ppid != ppid)
374	return -ERANGE;
375
376	*_ppid = (pid_t) ppid;
377
378	return 0;
379	}
380
381	int wait_for_terminate(pid_t pid, siginfo_t *status) {
382	siginfo_t dummy;
383
384	assert(pid >= 1);
385
386	if (!status)
387	status = &dummy;
388
389	for (;;) {
390	zero(*status);
391
392	if (waitid(P_PID, pid, status, WEXITED) < 0) {
393
394	if (errno == EINTR)
395	continue;
396
397	return -errno;
398	}
399
400	return 0;
401	}
402	}
403
404	/*
405	* Return values:
406	* < 0 : wait_for_terminate() failed to get the state of the
407	* process, the process was terminated by a signal, or
408	* failed for an unknown reason.
409	* >=0 : The process terminated normally, and its exit code is
410	* returned.
411	*
412	* That is, success is indicated by a return value of zero, and an
413	* error is indicated by a non-zero value.
414	*
415	* A warning is emitted if the process terminates abnormally,
416	* and also if it returns non-zero unless check_exit_code is true.
417	*/
418	int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) {
419	int r;
420	siginfo_t status;
421
422	assert(name);
423	assert(pid > 1);
424
425	r = wait_for_terminate(pid, &status);
426	if (r < 0)
427	return log_warning_errno(r, "Failed to wait for %s: %m", name);
428
429	if (status.si_code == CLD_EXITED) {
430	if (status.si_status != 0)
431	log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG,
432	"%s failed with error code %i.", name, status.si_status);
433	else
434	log_debug("%s succeeded.", name);
435
436	return status.si_status;
437	} else if (status.si_code == CLD_KILLED \|\|
438	status.si_code == CLD_DUMPED) {
439
440	log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
441	return -EPROTO;
442	}
443
444	log_warning("%s failed due to unknown reason.", name);
445	return -EPROTO;
446	}
447
448	int kill_and_sigcont(pid_t pid, int sig) {
449	int r;
450
451	r = kill(pid, sig) < 0 ? -errno : 0;
452
453	if (r >= 0)
454	kill(pid, SIGCONT);
455
456	return r;
457	}
458
459	int getenv_for_pid(pid_t pid, const char field, char *_value) {
460	_cleanup_fclose_ FILE *f = NULL;
461	char *value = NULL;
462	int r;
463	bool done = false;
464	size_t l;
465	const char *path;
466
467	assert(pid >= 0);
468	assert(field);
469	assert(_value);
470
471	path = procfs_file_alloca(pid, "environ");
472
473	f = fopen(path, "re");
474	if (!f)
475	return -errno;
476
477	l = strlen(field);
478	r = 0;
479
480	do {
481	char line[LINE_MAX];
482	unsigned i;
483
484	for (i = 0; i < sizeof(line)-1; i++) {
485	int c;
486
487	c = getc(f);
488	if (_unlikely_(c == EOF)) {
489	done = true;
490	break;
491	} else if (c == 0)
492	break;
493
494	line[i] = c;
495	}
496	line[i] = 0;
497
498	if (memcmp(line, field, l) == 0 && line[l] == '=') {
499	value = strdup(line + l + 1);
500	if (!value)
501	return -ENOMEM;
502
503	r = 1;
504	break;
505	}
506
507	} while (!done);
508
509	*_value = value;
510	return r;
511	}
512
513	bool pid_is_unwaited(pid_t pid) {
514	/* Checks whether a PID is still valid at all, including a zombie */
515
516	if (pid <= 0)
517	return false;
518
519	if (kill(pid, 0) >= 0)
520	return true;
521
522	return errno != ESRCH;
523	}
524
525	bool pid_is_alive(pid_t pid) {
526	int r;
527
528	/* Checks whether a PID is still valid and not a zombie */
529
530	if (pid <= 0)
531	return false;
532
533	r = get_process_state(pid);
534	if (r == -ENOENT \|\| r == 'Z')
535	return false;
536
537	return true;
538	}