--- /dev/null
+/* Copyright (C) 2009 Pierre-Marc Fournier, Philippe Proulx-Barrette
+ *
+ * This library 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.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <string.h>
+#include <dirent.h>
+#
+
+#include "ustcomm.h"
+#include "ustcmd.h"
+
+#define _GNU_SOURCE
+
+pid_t* ustcmd_get_online_pids(void) {
+ struct dirent* dirent;
+ DIR* dir;
+ char* ping_res;
+
+ dir = opendir(SOCK_DIR);
+ if (!dir) {
+ return NULL;
+ }
+
+ unsigned int ret_size = 1 * sizeof(pid_t), i = 0;
+ pid_t* ret = (pid_t*) malloc(ret_size);
+
+ while (dirent = readdir(dir)) {
+ if (!strcmp(dirent->d_name, ".") ||
+ !strcmp(dirent->d_name, "..")) {
+
+ continue;
+ }
+
+ if (dirent->d_type != DT_DIR &&
+ !!strcmp(dirent->d_name, "ustd")) {
+
+ sscanf(dirent->d_name, "%u", (unsigned int*) &ret[i]);
+ if (pid_is_online(ret[i])) {
+ ret_size += sizeof(pid_t);
+ ret = (pid_t*) realloc(ret, ret_size);
+ ++i;
+ }
+ }
+ }
+
+ ret[i] = 0; // Array end
+
+ if (ret[0] == 0) { // No PID at all..
+ free(ret);
+ return NULL;
+ }
+
+ closedir(dir);
+ return ret;
+}
+
+/**
+ * Sets marker state (USTCMD_MS_ON or USTCMD_MS_OFF).
+ *
+ * @param mn Marker name
+ * @param state Marker's new state
+ * @param pid Traced process ID
+ * @return 0 if successful, or errors {USTCMD_ERR_GEN, USTCMD_ERR_ARG}
+ */
+int ustcmd_set_marker_state(const char* mn, int state, pid_t pid) {
+ if (mn == NULL) {
+ return USTCMD_ERR_ARG;
+ }
+
+ char* cmd_str [] = {"disable_marker", "enable_marker"};
+ char* cmd;
+ asprintf(&cmd, "%s %s", cmd_str[state], mn);
+
+ int tres;
+ if (tres = ustcmd_shoot(cmd, pid, NULL)) {
+ free(cmd);
+ return USTCMD_ERR_GEN;
+ }
+
+ free(cmd);
+ return 0;
+}
+
+/**
+ * Destroys an UST trace according to a PID.
+ *
+ * @param pid Traced process ID
+ * @return 0 if successful, or error USTCMD_ERR_GEN
+ */
+int ustcmd_destroy_trace(pid_t pid) {
+ int tres;
+
+ if (tres = ustcmd_shoot("destroy", pid, NULL)) {
+ return USTCMD_ERR_GEN;
+ }
+
+ return 0;
+}
+
+/**
+ * Starts an UST trace (and setups it) according to a PID.
+ *
+ * @param pid Traced process ID
+ * @return 0 if successful, or error USTCMD_ERR_GEN
+ */
+int ustcmd_setup_and_start(pid_t pid) {
+ int tres;
+
+ if (tres = ustcmd_shoot("start", pid, NULL)) {
+ return USTCMD_ERR_GEN;
+ }
+
+ return 0;
+}
+
+/**
+ * Starts an UST trace according to a PID.
+ *
+ * @param pid Traced process ID
+ * @return 0 if successful, or error USTCMD_ERR_GEN
+ */
+int ustcmd_start_trace(pid_t pid) {
+ int tres;
+
+ if (tres = ustcmd_shoot("trace_start", pid, NULL)) {
+ return USTCMD_ERR_GEN;
+ }
+
+ return 0;
+}
+
+/**
+ * Stops an UST trace according to a PID.
+ *
+ * @param pid Traced process ID
+ * @return 0 if successful, or error USTCMD_ERR_GEN
+ */
+int ustcmd_stop_trace(pid_t pid) {
+ int tres;
+
+ if (tres = ustcmd_shoot("trace_stop", pid, NULL)) {
+ return USTCMD_ERR_GEN;
+ }
+
+ return 0;
+}
+
+/**
+ * Counts newlines ('\n') in a string.
+ *
+ * @param str String to search in
+ * @return Total newlines count
+ */
+unsigned int ustcmd_count_nl(const char* str) {
+ unsigned int i = 0, tot = 0;
+
+ while (str[i] != '\0') {
+ if (str[i] == '\n') {
+ ++tot;
+ }
+ ++i;
+ }
+
+ return tot;
+}
+
+/**
+ * Frees a CMSF array.
+ *
+ * @param cmsf CMSF array to free
+ * @return 0 if successful, or error USTCMD_ERR_ARG
+ */
+int ustcmd_free_cmsf(struct USTcmd_cmsf* cmsf) {
+ if (cmsf == NULL) {
+ return USTCMD_ERR_ARG;
+ }
+
+ unsigned int i = 0;
+ while (cmsf[i].channel != NULL) {
+ free(cmsf[i].channel);
+ free(cmsf[i].marker);
+ free(cmsf[i].fs);
+ ++i;
+ }
+ free(cmsf);
+
+ return 0;
+}
+
+/**
+ * Gets channel/marker/state/format string for a given PID.
+ *
+ * @param cmsf Pointer to CMSF array to be filled (callee allocates, caller
+ * frees with `ustcmd_free_cmsf')
+ * @param pid Targeted PID
+ * @return 0 if successful, or errors {USTCMD_ERR_ARG, USTCMD_ERR_GEN}
+ */
+int ustcmd_get_cmsf(struct USTcmd_cmsf** cmsf, const pid_t pid) {
+ if (cmsf == NULL) {
+ return USTCMD_ERR_ARG;
+ }
+ char* big_str = NULL;
+ int tres;
+
+ if (tres = ustcmd_shoot("list_markers", pid, &big_str)) {
+ return USTCMD_ERR_GEN;
+ }
+
+ if (big_str == NULL) {
+ fprintf(stderr, "ustcmd: error while getting markers list\n");
+ return USTCMD_ERR_GEN;
+ }
+
+ struct USTcmd_cmsf* tmp_cmsf = NULL;
+ tmp_cmsf = (struct USTcmd_cmsf*) malloc(sizeof(struct USTcmd_cmsf) *
+ (ustcmd_count_nl(big_str) + 1));
+ if (tmp_cmsf == NULL) {
+ return USTCMD_ERR_GEN;
+ }
+
+ // Parse received reply string (format: "[chan]/[mark] [st] [fs]"):
+ unsigned int i = 0, cur_st, cmsf_ind = 0;
+ while (big_str[i] != '\0') {
+ /* RAW METHOD (REPLACED BY SSCANF):
+ cur_st = i; // Set current start at beginning of current line
+ while (big_str[i] != '/') {
+ ++i; // Go to next '/'
+ }
+ tmp_cmsf[cmsf_ind].channel =
+ strndup(big_str + cur_st, i - cur_st);
+
+ ++i; // Go after '/'
+ cur_st = i; // Set current start at beginning of marker name
+ while (big_str[i] != ' ') {
+ ++i; // Go to next ' '
+ }
+ tmp_cmsf[cmsf_ind].marker =
+ strndup(big_str + cur_st, i - cur_st);
+
+ ++i; // Go after ' '
+ tmp_cmsf[cmsf_ind].state = (big_str[i] == USTCMD_MS_CHR_ON ?
+ USTCMD_MS_ON : USTCMD_MS_OFF); // Marker state
+
+ i += 2; // Go to format string (after state and another ' ')
+ cur_st = i; // Set current start at beginning of format string
+ while (big_str[i] != '\n') {
+ ++i; // Go to next '\n'
+ }
+ tmp_cmsf[cmsf_ind].fs =
+ strndup(big_str + cur_st, i - cur_st);
+ */
+
+ char state;
+ sscanf(big_str + i, "%a[^/]/%a[^ ] %c %a[^\n]",
+ &tmp_cmsf[cmsf_ind].channel,
+ &tmp_cmsf[cmsf_ind].marker,
+ &state,
+ &tmp_cmsf[cmsf_ind].fs);
+ tmp_cmsf[cmsf_ind].state = (state == USTCMD_MS_CHR_ON ?
+ USTCMD_MS_ON : USTCMD_MS_OFF); // Marker state
+
+ while (big_str[i] != '\n') {
+ ++i; // Go to next '\n'
+ }
+ ++i; // Skip current pointed '\n'
+ ++cmsf_ind;
+ }
+ tmp_cmsf[cmsf_ind].channel = NULL;
+ tmp_cmsf[cmsf_ind].marker = NULL;
+ tmp_cmsf[cmsf_ind].fs = NULL;
+
+ *cmsf = tmp_cmsf;
+
+ free(big_str);
+ return 0;
+}
+
+/**
+ * Shoots a given command using ustcomm.
+ *
+ * @param cmd Null-terminated command to shoot
+ * @param pid Targeted PID
+ * @param reply Pointer to string to be filled with a reply string (must
+ * be NULL if no reply is needed for the given command).
+ * @return 0 if successful, or errors {USTCMD_ERR_ARG, USTCMD_ERR_CONN}
+ */
+int ustcmd_shoot(const char* cmd, const pid_t pid, char** reply) {
+ if (cmd == NULL) {
+ return USTCMD_ERR_ARG;
+ }
+
+ struct ustcomm_connection conn;
+ if (ustcomm_connect_app(pid, &conn)) {
+ fprintf(stderr, "ustcmd_shoot: could not connect to PID %u\n",
+ (unsigned int) pid);
+ return USTCMD_ERR_CONN;
+ }
+
+ ustcomm_send_request(&conn, cmd, reply);
+
+ return 0;
+}
+
projects / lttng-ust.git / commitdiff
