2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 * Copyright (C) 2013 - Raphaël Beamonte <raphael.beamonte@gmail.com>
4 * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License, version 2 only, as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc., 51
17 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include <sys/types.h>
35 #include <common/common.h>
36 #include <common/runas.h>
37 #include <common/compat/getenv.h>
38 #include <common/compat/string.h>
39 #include <common/compat/dirent.h>
40 #include <lttng/constant.h>
47 * Return a partial realpath(3) of the path even if the full path does not
48 * exist. For instance, with /tmp/test1/test2/test3, if test2/ does not exist
49 * but the /tmp/test1 does, the real path for /tmp/test1 is concatened with
50 * /test2/test3 then returned. In normal time, realpath(3) fails if the end
51 * point directory does not exist.
52 * In case resolved_path is NULL, the string returned was allocated in the
53 * function and thus need to be freed by the caller. The size argument allows
54 * to specify the size of the resolved_path argument if given, or the size to
58 char *utils_partial_realpath(const char *path
, char *resolved_path
, size_t size
)
60 char *cut_path
= NULL
, *try_path
= NULL
, *try_path_prev
= NULL
;
61 const char *next
, *prev
, *end
;
69 * Identify the end of the path, we don't want to treat the
70 * last char if it is a '/', we will just keep it on the side
71 * to be added at the end, and return a value coherent with
72 * the path given as argument
74 end
= path
+ strlen(path
);
75 if (*(end
-1) == '/') {
79 /* Initiate the values of the pointers before looping */
82 /* Only to ensure try_path is not NULL to enter the while */
83 try_path
= (char *)next
;
85 /* Resolve the canonical path of the first part of the path */
86 while (try_path
!= NULL
&& next
!= end
) {
87 char *try_path_buf
= NULL
;
90 * If there is not any '/' left, we want to try with
93 next
= strpbrk(next
+ 1, "/");
98 /* Cut the part we will be trying to resolve */
99 cut_path
= lttng_strndup(path
, next
- path
);
100 if (cut_path
== NULL
) {
101 PERROR("lttng_strndup");
105 try_path_buf
= zmalloc(LTTNG_PATH_MAX
);
111 /* Try to resolve this part */
112 try_path
= realpath((char *) cut_path
, try_path_buf
);
113 if (try_path
== NULL
) {
116 * There was an error, we just want to be assured it
117 * is linked to an unexistent directory, if it's another
118 * reason, we spawn an error
122 /* Ignore the error */
125 PERROR("realpath (partial_realpath)");
130 /* Save the place we are before trying the next step */
133 try_path_prev
= try_path
;
137 /* Free the allocated memory */
142 /* Allocate memory for the resolved path if necessary */
143 if (resolved_path
== NULL
) {
144 resolved_path
= zmalloc(size
);
145 if (resolved_path
== NULL
) {
146 PERROR("zmalloc resolved path");
152 * If we were able to solve at least partially the path, we can concatenate
153 * what worked and what didn't work
155 if (try_path_prev
!= NULL
) {
156 /* If we risk to concatenate two '/', we remove one of them */
157 if (try_path_prev
[strlen(try_path_prev
) - 1] == '/' && prev
[0] == '/') {
158 try_path_prev
[strlen(try_path_prev
) - 1] = '\0';
162 * Duplicate the memory used by prev in case resolved_path and
163 * path are pointers for the same memory space
165 cut_path
= strdup(prev
);
166 if (cut_path
== NULL
) {
171 /* Concatenate the strings */
172 snprintf(resolved_path
, size
, "%s%s", try_path_prev
, cut_path
);
174 /* Free the allocated memory */
178 try_path_prev
= NULL
;
180 * Else, we just copy the path in our resolved_path to
184 strncpy(resolved_path
, path
, size
);
187 /* Then we return the 'partially' resolved path */
188 return resolved_path
;
194 if (try_path_prev
!= try_path
) {
201 * Make a full resolution of the given path even if it doesn't exist.
202 * This function uses the utils_partial_realpath function to resolve
203 * symlinks and relatives paths at the start of the string, and
204 * implements functionnalities to resolve the './' and '../' strings
205 * in the middle of a path. This function is only necessary because
206 * realpath(3) does not accept to resolve unexistent paths.
207 * The returned string was allocated in the function, it is thus of
208 * the responsibility of the caller to free this memory.
211 char *utils_expand_path(const char *path
)
213 char *next
, *previous
, *slash
, *start_path
, *absolute_path
= NULL
;
215 int is_dot
, is_dotdot
;
222 /* Allocate memory for the absolute_path */
223 absolute_path
= zmalloc(PATH_MAX
);
224 if (absolute_path
== NULL
) {
225 PERROR("zmalloc expand path");
230 * If the path is not already absolute nor explicitly relative,
231 * consider we're in the current directory
233 if (*path
!= '/' && strncmp(path
, "./", 2) != 0 &&
234 strncmp(path
, "../", 3) != 0) {
235 snprintf(absolute_path
, PATH_MAX
, "./%s", path
);
236 /* Else, we just copy the path */
238 strncpy(absolute_path
, path
, PATH_MAX
);
241 /* Resolve partially our path */
242 absolute_path
= utils_partial_realpath(absolute_path
,
243 absolute_path
, PATH_MAX
);
245 /* As long as we find '/./' in the working_path string */
246 while ((next
= strstr(absolute_path
, "/./"))) {
248 /* We prepare the start_path not containing it */
249 start_path
= lttng_strndup(absolute_path
, next
- absolute_path
);
251 PERROR("lttng_strndup");
254 /* And we concatenate it with the part after this string */
255 snprintf(absolute_path
, PATH_MAX
, "%s%s", start_path
, next
+ 2);
260 /* As long as we find '/../' in the working_path string */
261 while ((next
= strstr(absolute_path
, "/../"))) {
262 /* We find the last level of directory */
263 previous
= absolute_path
;
264 while ((slash
= strpbrk(previous
, "/")) && slash
!= next
) {
265 previous
= slash
+ 1;
268 /* Then we prepare the start_path not containing it */
269 start_path
= lttng_strndup(absolute_path
, previous
- absolute_path
);
271 PERROR("lttng_strndup");
275 /* And we concatenate it with the part after the '/../' */
276 snprintf(absolute_path
, PATH_MAX
, "%s%s", start_path
, next
+ 4);
278 /* We can free the memory used for the start path*/
281 /* Then we verify for symlinks using partial_realpath */
282 absolute_path
= utils_partial_realpath(absolute_path
,
283 absolute_path
, PATH_MAX
);
286 /* Identify the last token */
287 last_token
= strrchr(absolute_path
, '/');
289 /* Verify that this token is not a relative path */
290 is_dotdot
= (strcmp(last_token
, "/..") == 0);
291 is_dot
= (strcmp(last_token
, "/.") == 0);
293 /* If it is, take action */
294 if (is_dot
|| is_dotdot
) {
295 /* For both, remove this token */
298 /* If it was a reference to parent directory, go back one more time */
300 last_token
= strrchr(absolute_path
, '/');
302 /* If there was only one level left, we keep the first '/' */
303 if (last_token
== absolute_path
) {
311 return absolute_path
;
319 * Create a pipe in dst.
322 int utils_create_pipe(int *dst
)
332 PERROR("create pipe");
339 * Create pipe and set CLOEXEC flag to both fd.
341 * Make sure the pipe opened by this function are closed at some point. Use
342 * utils_close_pipe().
345 int utils_create_pipe_cloexec(int *dst
)
353 ret
= utils_create_pipe(dst
);
358 for (i
= 0; i
< 2; i
++) {
359 ret
= fcntl(dst
[i
], F_SETFD
, FD_CLOEXEC
);
361 PERROR("fcntl pipe cloexec");
371 * Create pipe and set fd flags to FD_CLOEXEC and O_NONBLOCK.
373 * Make sure the pipe opened by this function are closed at some point. Use
374 * utils_close_pipe(). Using pipe() and fcntl rather than pipe2() to
375 * support OSes other than Linux 2.6.23+.
378 int utils_create_pipe_cloexec_nonblock(int *dst
)
386 ret
= utils_create_pipe(dst
);
391 for (i
= 0; i
< 2; i
++) {
392 ret
= fcntl(dst
[i
], F_SETFD
, FD_CLOEXEC
);
394 PERROR("fcntl pipe cloexec");
398 * Note: we override any flag that could have been
399 * previously set on the fd.
401 ret
= fcntl(dst
[i
], F_SETFL
, O_NONBLOCK
);
403 PERROR("fcntl pipe nonblock");
413 * Close both read and write side of the pipe.
416 void utils_close_pipe(int *src
)
424 for (i
= 0; i
< 2; i
++) {
432 PERROR("close pipe");
438 * Create a new string using two strings range.
441 char *utils_strdupdelim(const char *begin
, const char *end
)
445 str
= zmalloc(end
- begin
+ 1);
447 PERROR("zmalloc strdupdelim");
451 memcpy(str
, begin
, end
- begin
);
452 str
[end
- begin
] = '\0';
459 * Set CLOEXEC flag to the give file descriptor.
462 int utils_set_fd_cloexec(int fd
)
471 ret
= fcntl(fd
, F_SETFD
, FD_CLOEXEC
);
473 PERROR("fcntl cloexec");
482 * Create pid file to the given path and filename.
485 int utils_create_pid_file(pid_t pid
, const char *filepath
)
492 fp
= fopen(filepath
, "w");
494 PERROR("open pid file %s", filepath
);
499 ret
= fprintf(fp
, "%d\n", (int) pid
);
501 PERROR("fprintf pid file");
508 DBG("Pid %d written in file %s", (int) pid
, filepath
);
515 * Create lock file to the given path and filename.
516 * Returns the associated file descriptor, -1 on error.
519 int utils_create_lock_file(const char *filepath
)
527 memset(&lock
, 0, sizeof(lock
));
528 fd
= open(filepath
, O_CREAT
| O_WRONLY
, S_IRUSR
| S_IWUSR
|
531 PERROR("open lock file %s", filepath
);
537 * Attempt to lock the file. If this fails, there is
538 * already a process using the same lock file running
539 * and we should exit.
541 lock
.l_whence
= SEEK_SET
;
542 lock
.l_type
= F_WRLCK
;
544 ret
= fcntl(fd
, F_SETLK
, &lock
);
546 PERROR("fcntl lock file");
547 ERR("Could not get lock file %s, another instance is running.",
550 PERROR("close lock file");
561 * On some filesystems (e.g. nfs), mkdir will validate access rights before
562 * checking for the existence of the path element. This means that on a setup
563 * where "/home/" is a mounted NFS share, and running as an unpriviledged user,
564 * recursively creating a path of the form "/home/my_user/trace/" will fail with
565 * EACCES on mkdir("/home", ...).
567 * Performing a stat(...) on the path to check for existence allows us to
568 * work around this behaviour.
571 int mkdir_check_exists(const char *path
, mode_t mode
)
576 ret
= stat(path
, &st
);
578 if (S_ISDIR(st
.st_mode
)) {
579 /* Directory exists, skip. */
582 /* Exists, but is not a directory. */
590 * Let mkdir handle other errors as the caller expects mkdir
593 ret
= mkdir(path
, mode
);
599 * Create directory using the given path and mode.
601 * On success, return 0 else a negative error code.
604 int utils_mkdir(const char *path
, mode_t mode
, int uid
, int gid
)
608 if (uid
< 0 || gid
< 0) {
609 ret
= mkdir_check_exists(path
, mode
);
611 ret
= run_as_mkdir(path
, mode
, uid
, gid
);
614 if (errno
!= EEXIST
) {
615 PERROR("mkdir %s, uid %d, gid %d", path
? path
: "NULL",
626 * Internal version of mkdir_recursive. Runs as the current user.
627 * Don't call directly; use utils_mkdir_recursive().
629 * This function is ominously marked as "unsafe" since it should only
630 * be called by a caller that has transitioned to the uid and gid under which
631 * the directory creation should occur.
634 int _utils_mkdir_recursive_unsafe(const char *path
, mode_t mode
)
636 char *p
, tmp
[PATH_MAX
];
642 ret
= snprintf(tmp
, sizeof(tmp
), "%s", path
);
644 PERROR("snprintf mkdir");
649 if (tmp
[len
- 1] == '/') {
653 for (p
= tmp
+ 1; *p
; p
++) {
656 if (tmp
[strlen(tmp
) - 1] == '.' &&
657 tmp
[strlen(tmp
) - 2] == '.' &&
658 tmp
[strlen(tmp
) - 3] == '/') {
659 ERR("Using '/../' is not permitted in the trace path (%s)",
664 ret
= mkdir_check_exists(tmp
, mode
);
666 if (errno
!= EACCES
) {
667 PERROR("mkdir recursive");
676 ret
= mkdir_check_exists(tmp
, mode
);
678 PERROR("mkdir recursive last element");
687 * Recursively create directory using the given path and mode, under the
688 * provided uid and gid.
690 * On success, return 0 else a negative error code.
693 int utils_mkdir_recursive(const char *path
, mode_t mode
, int uid
, int gid
)
697 if (uid
< 0 || gid
< 0) {
698 /* Run as current user. */
699 ret
= _utils_mkdir_recursive_unsafe(path
, mode
);
701 ret
= run_as_mkdir_recursive(path
, mode
, uid
, gid
);
704 PERROR("mkdir %s, uid %d, gid %d", path
? path
: "NULL",
712 * path is the output parameter. It needs to be PATH_MAX len.
714 * Return 0 on success or else a negative value.
716 static int utils_stream_file_name(char *path
,
717 const char *path_name
, const char *file_name
,
718 uint64_t size
, uint64_t count
,
722 char full_path
[PATH_MAX
];
723 char *path_name_suffix
= NULL
;
726 ret
= snprintf(full_path
, sizeof(full_path
), "%s/%s",
727 path_name
, file_name
);
729 PERROR("snprintf create output file");
733 /* Setup extra string if suffix or/and a count is needed. */
734 if (size
> 0 && suffix
) {
735 ret
= asprintf(&extra
, "_%" PRIu64
"%s", count
, suffix
);
736 } else if (size
> 0) {
737 ret
= asprintf(&extra
, "_%" PRIu64
, count
);
739 ret
= asprintf(&extra
, "%s", suffix
);
742 PERROR("Allocating extra string to name");
747 * If we split the trace in multiple files, we have to add the count at
748 * the end of the tracefile name.
751 ret
= asprintf(&path_name_suffix
, "%s%s", full_path
, extra
);
753 PERROR("Allocating path name with extra string");
754 goto error_free_suffix
;
756 strncpy(path
, path_name_suffix
, PATH_MAX
- 1);
757 path
[PATH_MAX
- 1] = '\0';
759 strncpy(path
, full_path
, PATH_MAX
- 1);
761 path
[PATH_MAX
- 1] = '\0';
764 free(path_name_suffix
);
772 * Create the stream file on disk.
774 * Return 0 on success or else a negative value.
777 int utils_create_stream_file(const char *path_name
, char *file_name
, uint64_t size
,
778 uint64_t count
, int uid
, int gid
, char *suffix
)
780 int ret
, flags
, mode
;
783 ret
= utils_stream_file_name(path
, path_name
, file_name
,
784 size
, count
, suffix
);
789 flags
= O_WRONLY
| O_CREAT
| O_TRUNC
;
790 /* Open with 660 mode */
791 mode
= S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
;
793 if (uid
< 0 || gid
< 0) {
794 ret
= open(path
, flags
, mode
);
796 ret
= run_as_open(path
, flags
, mode
, uid
, gid
);
799 PERROR("open stream path %s", path
);
806 * Unlink the stream tracefile from disk.
808 * Return 0 on success or else a negative value.
811 int utils_unlink_stream_file(const char *path_name
, char *file_name
, uint64_t size
,
812 uint64_t count
, int uid
, int gid
, char *suffix
)
817 ret
= utils_stream_file_name(path
, path_name
, file_name
,
818 size
, count
, suffix
);
822 if (uid
< 0 || gid
< 0) {
825 ret
= run_as_unlink(path
, uid
, gid
);
831 DBG("utils_unlink_stream_file %s returns %d", path
, ret
);
836 * Change the output tracefile according to the given size and count The
837 * new_count pointer is set during this operation.
839 * From the consumer, the stream lock MUST be held before calling this function
840 * because we are modifying the stream status.
842 * Return 0 on success or else a negative value.
845 int utils_rotate_stream_file(char *path_name
, char *file_name
, uint64_t size
,
846 uint64_t count
, int uid
, int gid
, int out_fd
, uint64_t *new_count
,
855 PERROR("Closing tracefile");
862 * In tracefile rotation, for the relay daemon we need
863 * to unlink the old file if present, because it may
864 * still be open in reading by the live thread, and we
865 * need to ensure that we do not overwrite the content
866 * between get_index and get_packet. Since we have no
867 * way to verify integrity of the data content compared
868 * to the associated index, we need to ensure the reader
869 * has exclusive access to the file content, and that
870 * the open of the data file is performed in get_index.
871 * Unlinking the old file rather than overwriting it
875 *new_count
= (*new_count
+ 1) % count
;
877 ret
= utils_unlink_stream_file(path_name
, file_name
, size
,
878 new_count
? *new_count
: 0, uid
, gid
, 0);
879 if (ret
< 0 && errno
!= ENOENT
) {
888 ret
= utils_create_stream_file(path_name
, file_name
, size
,
889 new_count
? *new_count
: 0, uid
, gid
, 0);
904 * Parse a string that represents a size in human readable format. It
905 * supports decimal integers suffixed by 'k', 'K', 'M' or 'G'.
907 * The suffix multiply the integer by:
912 * @param str The string to parse.
913 * @param size Pointer to a uint64_t that will be filled with the
916 * @return 0 on success, -1 on failure.
919 int utils_parse_size_suffix(const char * const str
, uint64_t * const size
)
928 DBG("utils_parse_size_suffix: received a NULL string.");
933 /* strtoull will accept a negative number, but we don't want to. */
934 if (strchr(str
, '-') != NULL
) {
935 DBG("utils_parse_size_suffix: invalid size string, should not contain '-'.");
940 /* str_end will point to the \0 */
941 str_end
= str
+ strlen(str
);
943 base_size
= strtoull(str
, &num_end
, 0);
945 PERROR("utils_parse_size_suffix strtoull");
950 if (num_end
== str
) {
951 /* strtoull parsed nothing, not good. */
952 DBG("utils_parse_size_suffix: strtoull had nothing good to parse.");
957 /* Check if a prefix is present. */
975 DBG("utils_parse_size_suffix: invalid suffix.");
980 /* Check for garbage after the valid input. */
981 if (num_end
!= str_end
) {
982 DBG("utils_parse_size_suffix: Garbage after size string.");
987 *size
= base_size
<< shift
;
989 /* Check for overflow */
990 if ((*size
>> shift
) != base_size
) {
991 DBG("utils_parse_size_suffix: oops, overflow detected.");
1002 * fls: returns the position of the most significant bit.
1003 * Returns 0 if no bit is set, else returns the position of the most
1004 * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit).
1006 #if defined(__i386) || defined(__x86_64)
1007 static inline unsigned int fls_u32(uint32_t x
)
1011 asm("bsrl %1,%0\n\t"
1015 : "=r" (r
) : "rm" (x
));
1021 #if defined(__x86_64)
1023 unsigned int fls_u64(uint64_t x
)
1027 asm("bsrq %1,%0\n\t"
1031 : "=r" (r
) : "rm" (x
));
1038 static __attribute__((unused
))
1039 unsigned int fls_u64(uint64_t x
)
1041 unsigned int r
= 64;
1046 if (!(x
& 0xFFFFFFFF00000000ULL
)) {
1050 if (!(x
& 0xFFFF000000000000ULL
)) {
1054 if (!(x
& 0xFF00000000000000ULL
)) {
1058 if (!(x
& 0xF000000000000000ULL
)) {
1062 if (!(x
& 0xC000000000000000ULL
)) {
1066 if (!(x
& 0x8000000000000000ULL
)) {
1075 static __attribute__((unused
)) unsigned int fls_u32(uint32_t x
)
1077 unsigned int r
= 32;
1082 if (!(x
& 0xFFFF0000U
)) {
1086 if (!(x
& 0xFF000000U
)) {
1090 if (!(x
& 0xF0000000U
)) {
1094 if (!(x
& 0xC0000000U
)) {
1098 if (!(x
& 0x80000000U
)) {
1107 * Return the minimum order for which x <= (1UL << order).
1108 * Return -1 if x is 0.
1111 int utils_get_count_order_u32(uint32_t x
)
1117 return fls_u32(x
- 1);
1121 * Return the minimum order for which x <= (1UL << order).
1122 * Return -1 if x is 0.
1125 int utils_get_count_order_u64(uint64_t x
)
1131 return fls_u64(x
- 1);
1135 * Obtain the value of LTTNG_HOME environment variable, if exists.
1136 * Otherwise returns the value of HOME.
1139 char *utils_get_home_dir(void)
1144 val
= lttng_secure_getenv(DEFAULT_LTTNG_HOME_ENV_VAR
);
1148 val
= lttng_secure_getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR
);
1153 /* Fallback on the password file entry. */
1154 pwd
= getpwuid(getuid());
1160 DBG3("Home directory is '%s'", val
);
1167 * Get user's home directory. Dynamically allocated, must be freed
1171 char *utils_get_user_home_dir(uid_t uid
)
1174 struct passwd
*result
;
1175 char *home_dir
= NULL
;
1180 buflen
= sysconf(_SC_GETPW_R_SIZE_MAX
);
1185 buf
= zmalloc(buflen
);
1190 ret
= getpwuid_r(uid
, &pwd
, buf
, buflen
, &result
);
1191 if (ret
|| !result
) {
1192 if (ret
== ERANGE
) {
1200 home_dir
= strdup(pwd
.pw_dir
);
1207 * With the given format, fill dst with the time of len maximum siz.
1209 * Return amount of bytes set in the buffer or else 0 on error.
1212 size_t utils_get_current_time_str(const char *format
, char *dst
, size_t len
)
1216 struct tm
*timeinfo
;
1221 /* Get date and time for session path */
1223 timeinfo
= localtime(&rawtime
);
1224 ret
= strftime(dst
, len
, format
, timeinfo
);
1226 ERR("Unable to strftime with format %s at dst %p of len %zu", format
,
1234 * Return the group ID matching name, else 0 if it cannot be found.
1237 gid_t
utils_get_group_id(const char *name
)
1241 grp
= getgrnam(name
);
1243 static volatile int warn_once
;
1246 WARN("No tracing group detected");
1255 * Return a newly allocated option string. This string is to be used as the
1256 * optstring argument of getopt_long(), see GETOPT(3). opt_count is the number
1257 * of elements in the long_options array. Returns NULL if the string's
1261 char *utils_generate_optstring(const struct option
*long_options
,
1265 size_t string_len
= opt_count
, str_pos
= 0;
1269 * Compute the necessary string length. One letter per option, two when an
1270 * argument is necessary, and a trailing NULL.
1272 for (i
= 0; i
< opt_count
; i
++) {
1273 string_len
+= long_options
[i
].has_arg
? 1 : 0;
1276 optstring
= zmalloc(string_len
);
1281 for (i
= 0; i
< opt_count
; i
++) {
1282 if (!long_options
[i
].name
) {
1283 /* Got to the trailing NULL element */
1287 if (long_options
[i
].val
!= '\0') {
1288 optstring
[str_pos
++] = (char) long_options
[i
].val
;
1289 if (long_options
[i
].has_arg
) {
1290 optstring
[str_pos
++] = ':';
1300 * Try to remove a hierarchy of empty directories, recursively. Don't unlink
1301 * any file. Try to rmdir any empty directory within the hierarchy.
1304 int utils_recursive_rmdir(const char *path
)
1308 int dir_fd
, ret
= 0, closeret
, is_empty
= 1;
1309 struct dirent
*entry
;
1311 /* Open directory */
1312 dir
= opendir(path
);
1314 PERROR("Cannot open '%s' path", path
);
1317 dir_fd
= lttng_dirfd(dir
);
1319 PERROR("lttng_dirfd");
1323 path_len
= strlen(path
);
1324 while ((entry
= readdir(dir
))) {
1327 char filename
[PATH_MAX
];
1329 if (!strcmp(entry
->d_name
, ".")
1330 || !strcmp(entry
->d_name
, "..")) {
1334 name_len
= strlen(entry
->d_name
);
1335 if (path_len
+ name_len
+ 2 > sizeof(filename
)) {
1336 ERR("Failed to remove file: path name too long (%s/%s)",
1337 path
, entry
->d_name
);
1340 if (snprintf(filename
, sizeof(filename
), "%s/%s",
1341 path
, entry
->d_name
) < 0) {
1342 ERR("Failed to format path.");
1346 if (stat(filename
, &st
)) {
1351 if (S_ISDIR(st
.st_mode
)) {
1352 char subpath
[PATH_MAX
];
1354 strncpy(subpath
, path
, PATH_MAX
);
1355 subpath
[PATH_MAX
- 1] = '\0';
1356 strncat(subpath
, "/",
1357 PATH_MAX
- strlen(subpath
) - 1);
1358 strncat(subpath
, entry
->d_name
,
1359 PATH_MAX
- strlen(subpath
) - 1);
1360 if (utils_recursive_rmdir(subpath
)) {
1363 } else if (S_ISREG(st
.st_mode
)) {
1371 closeret
= closedir(dir
);
1376 DBG3("Attempting rmdir %s", path
);
1383 int utils_truncate_stream_file(int fd
, off_t length
)
1388 ret
= ftruncate(fd
, length
);
1390 PERROR("ftruncate");
1393 lseek_ret
= lseek(fd
, length
, SEEK_SET
);
1394 if (lseek_ret
< 0) {
1403 static const char *get_man_bin_path(void)
1405 char *env_man_path
= lttng_secure_getenv(DEFAULT_MAN_BIN_PATH_ENV
);
1408 return env_man_path
;
1411 return DEFAULT_MAN_BIN_PATH
;
1415 int utils_show_help(int section
, const char *page_name
,
1416 const char *help_msg
)
1418 char section_string
[8];
1419 const char *man_bin_path
= get_man_bin_path();
1423 printf("%s", help_msg
);
1427 /* Section integer -> section string */
1428 ret
= sprintf(section_string
, "%d", section
);
1429 assert(ret
> 0 && ret
< 8);
1432 * Execute man pager.
1434 * We provide -M to man here because LTTng-tools can
1435 * be installed outside /usr, in which case its man pages are
1436 * not located in the default /usr/share/man directory.
1438 ret
= execlp(man_bin_path
, "man", "-M", MANPATH
,
1439 section_string
, page_name
, NULL
);
1446 int timespec_to_ms(struct timespec ts
, unsigned long *ms
)
1448 unsigned long res
, remain_ms
;
1450 if (ts
.tv_sec
> ULONG_MAX
/ MSEC_PER_SEC
) {
1452 return -1; /* multiplication overflow */
1454 res
= ts
.tv_sec
* MSEC_PER_SEC
;
1455 remain_ms
= ULONG_MAX
- res
;
1456 if (ts
.tv_nsec
/ NSEC_PER_MSEC
> remain_ms
) {
1458 return -1; /* addition overflow */
1460 res
+= ts
.tv_nsec
/ NSEC_PER_MSEC
;
1466 struct timespec
timespec_abs_diff(struct timespec t1
, struct timespec t2
)
1468 uint64_t ts1
= (uint64_t) t1
.tv_sec
* (uint64_t) NSEC_PER_SEC
+
1469 (uint64_t) t1
.tv_nsec
;
1470 uint64_t ts2
= (uint64_t) t2
.tv_sec
* (uint64_t) NSEC_PER_SEC
+
1471 (uint64_t) t2
.tv_nsec
;
1472 uint64_t diff
= max(ts1
, ts2
) - min(ts1
, ts2
);
1473 struct timespec res
;
1475 res
.tv_sec
= diff
/ (uint64_t) NSEC_PER_SEC
;
1476 res
.tv_nsec
= diff
% (uint64_t) NSEC_PER_SEC
;