1 /* Copyright (C) 2009 Pierre-Marc Fournier, Philippe Proulx-Barrette
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public
5 * License as published by the Free Software Foundation; either
6 * version 2.1 of the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "ust/ustcmd.h"
31 pid_t
*ustcmd_get_online_pids(void)
33 struct dirent
*dirent
;
35 unsigned int ret_size
= 1 * sizeof(pid_t
), i
= 0;
37 dir
= opendir(SOCK_DIR
);
42 pid_t
*ret
= (pid_t
*) malloc(ret_size
);
44 while ((dirent
= readdir(dir
))) {
45 if (!strcmp(dirent
->d_name
, ".") ||
46 !strcmp(dirent
->d_name
, "..")) {
51 if (dirent
->d_type
!= DT_DIR
&&
52 !!strcmp(dirent
->d_name
, "ustd")) {
54 sscanf(dirent
->d_name
, "%u", (unsigned int *) &ret
[i
]);
55 if (pid_is_online(ret
[i
])) {
56 ret_size
+= sizeof(pid_t
);
57 ret
= (pid_t
*) realloc(ret
, ret_size
);
63 ret
[i
] = 0; /* Array end */
76 * Sets marker state (USTCMD_MS_ON or USTCMD_MS_OFF).
78 * @param mn Marker name
79 * @param state Marker's new state
80 * @param pid Traced process ID
81 * @return 0 if successful, or errors {USTCMD_ERR_GEN, USTCMD_ERR_ARG}
83 int ustcmd_set_marker_state(const char *mn
, int state
, pid_t pid
)
85 char *cmd_str
[] = {"disable_marker", "enable_marker"};
90 return USTCMD_ERR_ARG
;
93 if (asprintf(&cmd
, "%s %s", cmd_str
[state
], mn
) < 0) {
94 ERR("ustcmd_set_marker_state : asprintf failed (%s %s)",
96 return USTCMD_ERR_GEN
;
99 result
= ustcmd_send_cmd(cmd
, pid
, NULL
);
102 return USTCMD_ERR_GEN
;
110 * Set subbuffer size.
112 * @param channel_size Channel name and size
113 * @param pid Traced process ID
114 * @return 0 if successful, or error
116 int ustcmd_set_subbuf_size(const char *channel_size
, pid_t pid
)
121 if (asprintf(&cmd
, "%s %s", "set_subbuf_size", channel_size
) < 0) {
122 ERR("ustcmd_set_subbuf_size : asprintf failed (set_subbuf_size %s)",
127 result
= ustcmd_send_cmd(cmd
, pid
, NULL
);
140 * @param channel_num Channel name and num
141 * @param pid Traced process ID
142 * @return 0 if successful, or error
144 int ustcmd_set_subbuf_num(const char *channel_size
, pid_t pid
)
149 if (asprintf(&cmd
, "%s %s", "set_subbuf_num", channel_size
) < 0) {
150 ERR("ustcmd_set_subbuf_num : asprintf failed (set_subbuf_num %s",
155 result
= ustcmd_send_cmd(cmd
, pid
, NULL
);
166 * Get subbuffer size.
168 * @param channel Channel name
169 * @param pid Traced process ID
170 * @return subbuf size if successful, or error
172 int ustcmd_get_subbuf_size(const char *channel
, pid_t pid
)
177 /* format: channel_cpu */
178 if (asprintf(&cmd
, "%s %s_0", "get_subbuf_size", channel
) < 0) {
179 ERR("ustcmd_get_subbuf_size : asprintf failed (get_subbuf_size, %s_0",
184 result
= ustcmd_send_cmd(cmd
, pid
, &reply
);
191 result
= atoi(reply
);
200 * @param channel Channel name
201 * @param pid Traced process ID
202 * @return subbuf cnf if successful, or error
204 int ustcmd_get_subbuf_num(const char *channel
, pid_t pid
)
209 /* format: channel_cpu */
210 if (asprintf(&cmd
, "%s %s_0", "get_n_subbufs", channel
) < 0) {
211 ERR("ustcmd_get_subbuf_num : asprintf failed (get_n_subbufs, %s_0",
216 result
= ustcmd_send_cmd(cmd
, pid
, &reply
);
223 result
= atoi(reply
);
230 * Destroys an UST trace according to a PID.
232 * @param pid Traced process ID
233 * @return 0 if successful, or error USTCMD_ERR_GEN
235 int ustcmd_destroy_trace(pid_t pid
)
239 result
= ustcmd_send_cmd("trace_destroy", pid
, NULL
);
241 return USTCMD_ERR_GEN
;
248 * Starts an UST trace (and setups it) according to a PID.
250 * @param pid Traced process ID
251 * @return 0 if successful, or error USTCMD_ERR_GEN
253 int ustcmd_setup_and_start(pid_t pid
)
257 result
= ustcmd_send_cmd("start", pid
, NULL
);
259 return USTCMD_ERR_GEN
;
266 * Creates an UST trace according to a PID.
268 * @param pid Traced process ID
269 * @return 0 if successful, or error USTCMD_ERR_GEN
271 int ustcmd_create_trace(pid_t pid
)
275 result
= ustcmd_send_cmd("trace_create", pid
, NULL
);
277 return USTCMD_ERR_GEN
;
284 * Starts an UST trace according to a PID.
286 * @param pid Traced process ID
287 * @return 0 if successful, or error USTCMD_ERR_GEN
289 int ustcmd_start_trace(pid_t pid
)
293 result
= ustcmd_send_cmd("trace_start", pid
, NULL
);
295 return USTCMD_ERR_GEN
;
302 * Alloc an UST trace according to a PID.
304 * @param pid Traced process ID
305 * @return 0 if successful, or error USTCMD_ERR_GEN
307 int ustcmd_alloc_trace(pid_t pid
)
311 result
= ustcmd_send_cmd("trace_alloc", pid
, NULL
);
313 return USTCMD_ERR_GEN
;
320 * Stops an UST trace according to a PID.
322 * @param pid Traced process ID
323 * @return 0 if successful, or error USTCMD_ERR_GEN
325 int ustcmd_stop_trace(pid_t pid
)
329 result
= ustcmd_send_cmd("trace_stop", pid
, NULL
);
331 return USTCMD_ERR_GEN
;
338 * Counts newlines ('\n') in a string.
340 * @param str String to search in
341 * @return Total newlines count
343 unsigned int ustcmd_count_nl(const char *str
)
345 unsigned int i
= 0, tot
= 0;
347 while (str
[i
] != '\0') {
348 if (str
[i
] == '\n') {
358 * Frees a CMSF array.
360 * @param cmsf CMSF array to free
361 * @return 0 if successful, or error USTCMD_ERR_ARG
363 int ustcmd_free_cmsf(struct marker_status
*cmsf
)
366 return USTCMD_ERR_ARG
;
370 while (cmsf
[i
].channel
!= NULL
) {
371 free(cmsf
[i
].channel
);
372 free(cmsf
[i
].marker
);
382 * Gets channel/marker/state/format string for a given PID.
384 * @param cmsf Pointer to CMSF array to be filled (callee allocates, caller
385 * frees with `ustcmd_free_cmsf')
386 * @param pid Targeted PID
387 * @return 0 if successful, or -1 on error
389 int ustcmd_get_cmsf(struct marker_status
**cmsf
, const pid_t pid
)
391 char *big_str
= NULL
;
393 struct marker_status
*tmp_cmsf
= NULL
;
394 unsigned int i
= 0, cmsf_ind
= 0;
399 result
= ustcmd_send_cmd("list_markers", pid
, &big_str
);
405 ERR("error while getting markers list");
409 tmp_cmsf
= (struct marker_status
*) malloc(sizeof(struct marker_status
) *
410 (ustcmd_count_nl(big_str
) + 1));
411 if (tmp_cmsf
== NULL
) {
415 /* Parse received reply string (format: "[chan]/[mark] [st] [fs]"): */
416 while (big_str
[i
] != '\0') {
419 sscanf(big_str
+ i
, "marker: %a[^/]/%a[^ ] %c %a[^\n]",
420 &tmp_cmsf
[cmsf_ind
].channel
,
421 &tmp_cmsf
[cmsf_ind
].marker
,
423 &tmp_cmsf
[cmsf_ind
].fs
);
424 tmp_cmsf
[cmsf_ind
].state
= (state
== USTCMD_MS_CHR_ON
?
425 USTCMD_MS_ON
: USTCMD_MS_OFF
); /* Marker state */
427 while (big_str
[i
] != '\n') {
428 ++i
; /* Go to next '\n' */
430 ++i
; /* Skip current pointed '\n' */
433 tmp_cmsf
[cmsf_ind
].channel
= NULL
;
434 tmp_cmsf
[cmsf_ind
].marker
= NULL
;
435 tmp_cmsf
[cmsf_ind
].fs
= NULL
;
446 * @param sock_path Socket path
447 * @param pid Traced process ID
448 * @return 0 if successful, or error
450 int ustcmd_set_sock_path(const char *sock_path
, pid_t pid
)
455 if (asprintf(&cmd
, "%s %s", "set_sock_path", sock_path
) < 0) {
456 ERR("ustcmd_set_sock_path : asprintf failed (set_sock_path, %s",
461 result
= ustcmd_send_cmd(cmd
, pid
, NULL
);
464 return USTCMD_ERR_GEN
;
474 * @param sock_path Pointer to where the socket path will be returned
475 * @param pid Traced process ID
476 * @return 0 if successful, or error
478 int ustcmd_get_sock_path(char **sock_path
, pid_t pid
)
483 if (asprintf(&cmd
, "%s", "get_sock_path") < 0) {
484 ERR("ustcmd_get_sock_path : asprintf failed");
485 return USTCMD_ERR_GEN
;
488 result
= ustcmd_send_cmd(cmd
, pid
, &reply
);
492 return USTCMD_ERR_GEN
;
500 int ustcmd_force_switch(pid_t pid
)
504 result
= ustcmd_send_cmd("force_switch", pid
, NULL
);
506 return USTCMD_ERR_GEN
;
513 * Sends a given command to a traceable process
515 * @param cmd Null-terminated command to send
516 * @param pid Targeted PID
517 * @param reply Pointer to string to be filled with a reply string (must
518 * be NULL if no reply is needed for the given command).
519 * @return -1 if successful, 0 on EOT, 1 on success
522 int ustcmd_send_cmd(const char *cmd
, const pid_t pid
, char **reply
)
524 struct ustcomm_connection conn
;
527 if (ustcomm_connect_app(pid
, &conn
)) {
528 ERR("could not connect to PID %u", (unsigned int) pid
);
532 retval
= ustcomm_send_request(&conn
, cmd
, reply
);
534 ustcomm_close_app(&conn
);
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