X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Futils.c;h=eebed2adb71934800c5f0f49b42c6277817fa8e1;hp=f3cb9e0306e599a3b7aef48bce1812cfc7d6a03a;hb=HEAD;hpb=cbf53d23cecaca9c6ec71582663c4a8254a9f285 diff --git a/src/common/utils.c b/src/common/utils.c deleted file mode 100644 index f3cb9e030..000000000 --- a/src/common/utils.c +++ /dev/null @@ -1,1538 +0,0 @@ -/* - * Copyright (C) 2012 - David Goulet - * Copyright (C) 2013 - Raphaël Beamonte - * Copyright (C) 2013 - Jérémie Galarneau - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License, version 2 only, as - * published by the Free Software Foundation. - * - * This program 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 General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 51 - * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#define _LGPL_SOURCE -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "utils.h" -#include "defaults.h" -#include "time.h" - -#define PROC_MEMINFO_PATH "/proc/meminfo" -#define PROC_MEMINFO_MEMAVAILABLE_LINE "MemAvailable:" -#define PROC_MEMINFO_MEMTOTAL_LINE "MemTotal:" - -/* The length of the longest field of `/proc/meminfo`. */ -#define PROC_MEMINFO_FIELD_MAX_NAME_LEN 20 - -#if (PROC_MEMINFO_FIELD_MAX_NAME_LEN == 20) -#define MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "19" -#else -#error MAX_NAME_LEN_SCANF_IS_A_BROKEN_API must be updated to match (PROC_MEMINFO_FIELD_MAX_NAME_LEN - 1) -#endif - -/* - * Return a partial realpath(3) of the path even if the full path does not - * exist. For instance, with /tmp/test1/test2/test3, if test2/ does not exist - * but the /tmp/test1 does, the real path for /tmp/test1 is concatened with - * /test2/test3 then returned. In normal time, realpath(3) fails if the end - * point directory does not exist. - * In case resolved_path is NULL, the string returned was allocated in the - * function and thus need to be freed by the caller. The size argument allows - * to specify the size of the resolved_path argument if given, or the size to - * allocate. - */ -LTTNG_HIDDEN -char *utils_partial_realpath(const char *path, char *resolved_path, size_t size) -{ - char *cut_path = NULL, *try_path = NULL, *try_path_prev = NULL; - const char *next, *prev, *end; - - /* Safety net */ - if (path == NULL) { - goto error; - } - - /* - * Identify the end of the path, we don't want to treat the - * last char if it is a '/', we will just keep it on the side - * to be added at the end, and return a value coherent with - * the path given as argument - */ - end = path + strlen(path); - if (*(end-1) == '/') { - end--; - } - - /* Initiate the values of the pointers before looping */ - next = path; - prev = next; - /* Only to ensure try_path is not NULL to enter the while */ - try_path = (char *)next; - - /* Resolve the canonical path of the first part of the path */ - while (try_path != NULL && next != end) { - char *try_path_buf = NULL; - - /* - * If there is not any '/' left, we want to try with - * the full path - */ - next = strpbrk(next + 1, "/"); - if (next == NULL) { - next = end; - } - - /* Cut the part we will be trying to resolve */ - cut_path = lttng_strndup(path, next - path); - if (cut_path == NULL) { - PERROR("lttng_strndup"); - goto error; - } - - try_path_buf = zmalloc(LTTNG_PATH_MAX); - if (!try_path_buf) { - PERROR("zmalloc"); - goto error; - } - - /* Try to resolve this part */ - try_path = realpath((char *) cut_path, try_path_buf); - if (try_path == NULL) { - free(try_path_buf); - /* - * There was an error, we just want to be assured it - * is linked to an unexistent directory, if it's another - * reason, we spawn an error - */ - switch (errno) { - case ENOENT: - /* Ignore the error */ - break; - default: - PERROR("realpath (partial_realpath)"); - goto error; - break; - } - } else { - /* Save the place we are before trying the next step */ - try_path_buf = NULL; - free(try_path_prev); - try_path_prev = try_path; - prev = next; - } - - /* Free the allocated memory */ - free(cut_path); - cut_path = NULL; - } - - /* Allocate memory for the resolved path if necessary */ - if (resolved_path == NULL) { - resolved_path = zmalloc(size); - if (resolved_path == NULL) { - PERROR("zmalloc resolved path"); - goto error; - } - } - - /* - * If we were able to solve at least partially the path, we can concatenate - * what worked and what didn't work - */ - if (try_path_prev != NULL) { - /* If we risk to concatenate two '/', we remove one of them */ - if (try_path_prev[strlen(try_path_prev) - 1] == '/' && prev[0] == '/') { - try_path_prev[strlen(try_path_prev) - 1] = '\0'; - } - - /* - * Duplicate the memory used by prev in case resolved_path and - * path are pointers for the same memory space - */ - cut_path = strdup(prev); - if (cut_path == NULL) { - PERROR("strdup"); - goto error; - } - - /* Concatenate the strings */ - snprintf(resolved_path, size, "%s%s", try_path_prev, cut_path); - - /* Free the allocated memory */ - free(cut_path); - free(try_path_prev); - cut_path = NULL; - try_path_prev = NULL; - /* - * Else, we just copy the path in our resolved_path to - * return it as is - */ - } else { - strncpy(resolved_path, path, size); - } - - /* Then we return the 'partially' resolved path */ - return resolved_path; - -error: - free(resolved_path); - free(cut_path); - free(try_path); - if (try_path_prev != try_path) { - free(try_path_prev); - } - return NULL; -} - -static -int expand_double_slashes_dot_and_dotdot(char *path) -{ - size_t expanded_path_len, path_len; - const char *curr_char, *path_last_char, *next_slash, *prev_slash; - - path_len = strlen(path); - path_last_char = &path[path_len]; - - if (path_len == 0) { - goto error; - } - - expanded_path_len = 0; - - /* We iterate over the provided path to expand the "//", "../" and "./" */ - for (curr_char = path; curr_char <= path_last_char; curr_char = next_slash + 1) { - /* Find the next forward slash. */ - size_t curr_token_len; - - if (curr_char == path_last_char) { - expanded_path_len++; - break; - } - - next_slash = memchr(curr_char, '/', path_last_char - curr_char); - if (next_slash == NULL) { - /* Reached the end of the provided path. */ - next_slash = path_last_char; - } - - /* Compute how long is the previous token. */ - curr_token_len = next_slash - curr_char; - switch(curr_token_len) { - case 0: - /* - * The pointer has not move meaning that curr_char is - * pointing to a slash. It that case there is no token - * to copy, so continue the iteration to find the next - * token - */ - continue; - case 1: - /* - * The pointer moved 1 character. Check if that - * character is a dot ('.'), if it is: omit it, else - * copy the token to the normalized path. - */ - if (curr_char[0] == '.') { - continue; - } - break; - case 2: - /* - * The pointer moved 2 characters. Check if these - * characters are double dots ('..'). If that is the - * case, we need to remove the last token of the - * normalized path. - */ - if (curr_char[0] == '.' && curr_char[1] == '.') { - /* - * Find the previous path component by - * using the memrchr function to find the - * previous forward slash and substract that - * len to the resulting path. - */ - prev_slash = lttng_memrchr(path, '/', expanded_path_len); - /* - * If prev_slash is NULL, we reached the - * beginning of the path. We can't go back any - * further. - */ - if (prev_slash != NULL) { - expanded_path_len = prev_slash - path; - } - continue; - } - break; - default: - break; - } - - /* - * Copy the current token which is neither a '.' nor a '..'. - */ - path[expanded_path_len++] = '/'; - memcpy(&path[expanded_path_len], curr_char, curr_token_len); - expanded_path_len += curr_token_len; - } - - if (expanded_path_len == 0) { - path[expanded_path_len++] = '/'; - } - - path[expanded_path_len] = '\0'; - return 0; -error: - return -1; -} - -/* - * Make a full resolution of the given path even if it doesn't exist. - * This function uses the utils_partial_realpath function to resolve - * symlinks and relatives paths at the start of the string, and - * implements functionnalities to resolve the './' and '../' strings - * in the middle of a path. This function is only necessary because - * realpath(3) does not accept to resolve unexistent paths. - * The returned string was allocated in the function, it is thus of - * the responsibility of the caller to free this memory. - */ -static -char *_utils_expand_path(const char *path, bool keep_symlink) -{ - int ret; - char *absolute_path = NULL; - char *last_token; - bool is_dot, is_dotdot; - - /* Safety net */ - if (path == NULL) { - goto error; - } - - /* Allocate memory for the absolute_path */ - absolute_path = zmalloc(LTTNG_PATH_MAX); - if (absolute_path == NULL) { - PERROR("zmalloc expand path"); - goto error; - } - - if (path[0] == '/') { - ret = lttng_strncpy(absolute_path, path, LTTNG_PATH_MAX); - if (ret) { - ERR("Path exceeds maximal size of %i bytes", LTTNG_PATH_MAX); - goto error; - } - } else { - /* - * This is a relative path. We need to get the present working - * directory and start the path walk from there. - */ - char current_working_dir[LTTNG_PATH_MAX]; - char *cwd_ret; - - cwd_ret = getcwd(current_working_dir, sizeof(current_working_dir)); - if (!cwd_ret) { - goto error; - } - /* - * Get the number of character in the CWD and allocate an array - * to can hold it and the path provided by the caller. - */ - ret = snprintf(absolute_path, LTTNG_PATH_MAX, "%s/%s", - current_working_dir, path); - if (ret >= LTTNG_PATH_MAX) { - ERR("Concatenating current working directory %s and path %s exceeds maximal size of %i bytes", - current_working_dir, path, LTTNG_PATH_MAX); - goto error; - } - } - - if (keep_symlink) { - /* Resolve partially our path */ - absolute_path = utils_partial_realpath(absolute_path, - absolute_path, LTTNG_PATH_MAX); - if (!absolute_path) { - goto error; - } - } - - ret = expand_double_slashes_dot_and_dotdot(absolute_path); - if (ret) { - goto error; - } - - /* Identify the last token */ - last_token = strrchr(absolute_path, '/'); - - /* Verify that this token is not a relative path */ - is_dotdot = (strcmp(last_token, "/..") == 0); - is_dot = (strcmp(last_token, "/.") == 0); - - /* If it is, take action */ - if (is_dot || is_dotdot) { - /* For both, remove this token */ - *last_token = '\0'; - - /* If it was a reference to parent directory, go back one more time */ - if (is_dotdot) { - last_token = strrchr(absolute_path, '/'); - - /* If there was only one level left, we keep the first '/' */ - if (last_token == absolute_path) { - last_token++; - } - - *last_token = '\0'; - } - } - - return absolute_path; - -error: - free(absolute_path); - return NULL; -} -LTTNG_HIDDEN -char *utils_expand_path(const char *path) -{ - return _utils_expand_path(path, true); -} - -LTTNG_HIDDEN -char *utils_expand_path_keep_symlink(const char *path) -{ - return _utils_expand_path(path, false); -} -/* - * Create a pipe in dst. - */ -LTTNG_HIDDEN -int utils_create_pipe(int *dst) -{ - int ret; - - if (dst == NULL) { - return -1; - } - - ret = pipe(dst); - if (ret < 0) { - PERROR("create pipe"); - } - - return ret; -} - -/* - * Create pipe and set CLOEXEC flag to both fd. - * - * Make sure the pipe opened by this function are closed at some point. Use - * utils_close_pipe(). - */ -LTTNG_HIDDEN -int utils_create_pipe_cloexec(int *dst) -{ - int ret, i; - - if (dst == NULL) { - return -1; - } - - ret = utils_create_pipe(dst); - if (ret < 0) { - goto error; - } - - for (i = 0; i < 2; i++) { - ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl pipe cloexec"); - goto error; - } - } - -error: - return ret; -} - -/* - * Create pipe and set fd flags to FD_CLOEXEC and O_NONBLOCK. - * - * Make sure the pipe opened by this function are closed at some point. Use - * utils_close_pipe(). Using pipe() and fcntl rather than pipe2() to - * support OSes other than Linux 2.6.23+. - */ -LTTNG_HIDDEN -int utils_create_pipe_cloexec_nonblock(int *dst) -{ - int ret, i; - - if (dst == NULL) { - return -1; - } - - ret = utils_create_pipe(dst); - if (ret < 0) { - goto error; - } - - for (i = 0; i < 2; i++) { - ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl pipe cloexec"); - goto error; - } - /* - * Note: we override any flag that could have been - * previously set on the fd. - */ - ret = fcntl(dst[i], F_SETFL, O_NONBLOCK); - if (ret < 0) { - PERROR("fcntl pipe nonblock"); - goto error; - } - } - -error: - return ret; -} - -/* - * Close both read and write side of the pipe. - */ -LTTNG_HIDDEN -void utils_close_pipe(int *src) -{ - int i, ret; - - if (src == NULL) { - return; - } - - for (i = 0; i < 2; i++) { - /* Safety check */ - if (src[i] < 0) { - continue; - } - - ret = close(src[i]); - if (ret) { - PERROR("close pipe"); - } - } -} - -/* - * Create a new string using two strings range. - */ -LTTNG_HIDDEN -char *utils_strdupdelim(const char *begin, const char *end) -{ - char *str; - - str = zmalloc(end - begin + 1); - if (str == NULL) { - PERROR("zmalloc strdupdelim"); - goto error; - } - - memcpy(str, begin, end - begin); - str[end - begin] = '\0'; - -error: - return str; -} - -/* - * Set CLOEXEC flag to the give file descriptor. - */ -LTTNG_HIDDEN -int utils_set_fd_cloexec(int fd) -{ - int ret; - - if (fd < 0) { - ret = -EINVAL; - goto end; - } - - ret = fcntl(fd, F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl cloexec"); - ret = -errno; - } - -end: - return ret; -} - -/* - * Create pid file to the given path and filename. - */ -LTTNG_HIDDEN -int utils_create_pid_file(pid_t pid, const char *filepath) -{ - int ret; - FILE *fp; - - assert(filepath); - - fp = fopen(filepath, "w"); - if (fp == NULL) { - PERROR("open pid file %s", filepath); - ret = -1; - goto error; - } - - ret = fprintf(fp, "%d\n", (int) pid); - if (ret < 0) { - PERROR("fprintf pid file"); - goto error; - } - - if (fclose(fp)) { - PERROR("fclose"); - } - DBG("Pid %d written in file %s", (int) pid, filepath); - ret = 0; -error: - return ret; -} - -/* - * Create lock file to the given path and filename. - * Returns the associated file descriptor, -1 on error. - */ -LTTNG_HIDDEN -int utils_create_lock_file(const char *filepath) -{ - int ret; - int fd; - struct flock lock; - - assert(filepath); - - memset(&lock, 0, sizeof(lock)); - fd = open(filepath, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | - S_IRGRP | S_IWGRP); - if (fd < 0) { - PERROR("open lock file %s", filepath); - fd = -1; - goto error; - } - - /* - * Attempt to lock the file. If this fails, there is - * already a process using the same lock file running - * and we should exit. - */ - lock.l_whence = SEEK_SET; - lock.l_type = F_WRLCK; - - ret = fcntl(fd, F_SETLK, &lock); - if (ret == -1) { - PERROR("fcntl lock file"); - ERR("Could not get lock file %s, another instance is running.", - filepath); - if (close(fd)) { - PERROR("close lock file"); - } - fd = ret; - goto error; - } - -error: - return fd; -} - -/* - * Create directory using the given path and mode. - * - * On success, return 0 else a negative error code. - */ -LTTNG_HIDDEN -int utils_mkdir(const char *path, mode_t mode, int uid, int gid) -{ - int ret; - struct lttng_directory_handle *handle; - const struct lttng_credentials creds = { - .uid = (uid_t) uid, - .gid = (gid_t) gid, - }; - - handle = lttng_directory_handle_create(NULL); - if (!handle) { - ret = -1; - goto end; - } - ret = lttng_directory_handle_create_subdirectory_as_user( - handle, path, mode, - (uid >= 0 || gid >= 0) ? &creds : NULL); -end: - lttng_directory_handle_put(handle); - return ret; -} - -/* - * Recursively create directory using the given path and mode, under the - * provided uid and gid. - * - * On success, return 0 else a negative error code. - */ -LTTNG_HIDDEN -int utils_mkdir_recursive(const char *path, mode_t mode, int uid, int gid) -{ - int ret; - struct lttng_directory_handle *handle; - const struct lttng_credentials creds = { - .uid = (uid_t) uid, - .gid = (gid_t) gid, - }; - - handle = lttng_directory_handle_create(NULL); - if (!handle) { - ret = -1; - goto end; - } - ret = lttng_directory_handle_create_subdirectory_recursive_as_user( - handle, path, mode, - (uid >= 0 || gid >= 0) ? &creds : NULL); -end: - lttng_directory_handle_put(handle); - return ret; -} - -/* - * out_stream_path is the output parameter. - * - * Return 0 on success or else a negative value. - */ -LTTNG_HIDDEN -int utils_stream_file_path(const char *path_name, const char *file_name, - uint64_t size, uint64_t count, const char *suffix, - char *out_stream_path, size_t stream_path_len) -{ - int ret; - char count_str[MAX_INT_DEC_LEN(count) + 1] = {}; - const char *path_separator; - - if (path_name && path_name[strlen(path_name) - 1] == '/') { - path_separator = ""; - } else { - path_separator = "/"; - } - - path_name = path_name ? : ""; - suffix = suffix ? : ""; - if (size > 0) { - ret = snprintf(count_str, sizeof(count_str), "_%" PRIu64, - count); - assert(ret > 0 && ret < sizeof(count_str)); - } - - ret = snprintf(out_stream_path, stream_path_len, "%s%s%s%s%s", - path_name, path_separator, file_name, count_str, - suffix); - if (ret < 0 || ret >= stream_path_len) { - ERR("Truncation occurred while formatting stream path"); - ret = -1; - } else { - ret = 0; - } - return ret; -} - -/** - * Parse a string that represents a size in human readable format. It - * supports decimal integers suffixed by 'k', 'K', 'M' or 'G'. - * - * The suffix multiply the integer by: - * 'k': 1024 - * 'M': 1024^2 - * 'G': 1024^3 - * - * @param str The string to parse. - * @param size Pointer to a uint64_t that will be filled with the - * resulting size. - * - * @return 0 on success, -1 on failure. - */ -LTTNG_HIDDEN -int utils_parse_size_suffix(const char * const str, uint64_t * const size) -{ - int ret; - uint64_t base_size; - long shift = 0; - const char *str_end; - char *num_end; - - if (!str) { - DBG("utils_parse_size_suffix: received a NULL string."); - ret = -1; - goto end; - } - - /* strtoull will accept a negative number, but we don't want to. */ - if (strchr(str, '-') != NULL) { - DBG("utils_parse_size_suffix: invalid size string, should not contain '-'."); - ret = -1; - goto end; - } - - /* str_end will point to the \0 */ - str_end = str + strlen(str); - errno = 0; - base_size = strtoull(str, &num_end, 0); - if (errno != 0) { - PERROR("utils_parse_size_suffix strtoull"); - ret = -1; - goto end; - } - - if (num_end == str) { - /* strtoull parsed nothing, not good. */ - DBG("utils_parse_size_suffix: strtoull had nothing good to parse."); - ret = -1; - goto end; - } - - /* Check if a prefix is present. */ - switch (*num_end) { - case 'G': - shift = GIBI_LOG2; - num_end++; - break; - case 'M': /* */ - shift = MEBI_LOG2; - num_end++; - break; - case 'K': - case 'k': - shift = KIBI_LOG2; - num_end++; - break; - case '\0': - break; - default: - DBG("utils_parse_size_suffix: invalid suffix."); - ret = -1; - goto end; - } - - /* Check for garbage after the valid input. */ - if (num_end != str_end) { - DBG("utils_parse_size_suffix: Garbage after size string."); - ret = -1; - goto end; - } - - *size = base_size << shift; - - /* Check for overflow */ - if ((*size >> shift) != base_size) { - DBG("utils_parse_size_suffix: oops, overflow detected."); - ret = -1; - goto end; - } - - ret = 0; -end: - return ret; -} - -/** - * Parse a string that represents a time in human readable format. It - * supports decimal integers suffixed by: - * "us" for microsecond, - * "ms" for millisecond, - * "s" for second, - * "m" for minute, - * "h" for hour - * - * The suffix multiply the integer by: - * "us" : 1 - * "ms" : 1000 - * "s" : 1000000 - * "m" : 60000000 - * "h" : 3600000000 - * - * Note that unit-less numbers are assumed to be microseconds. - * - * @param str The string to parse, assumed to be NULL-terminated. - * @param time_us Pointer to a uint64_t that will be filled with the - * resulting time in microseconds. - * - * @return 0 on success, -1 on failure. - */ -LTTNG_HIDDEN -int utils_parse_time_suffix(char const * const str, uint64_t * const time_us) -{ - int ret; - uint64_t base_time; - uint64_t multiplier = 1; - const char *str_end; - char *num_end; - - if (!str) { - DBG("utils_parse_time_suffix: received a NULL string."); - ret = -1; - goto end; - } - - /* strtoull will accept a negative number, but we don't want to. */ - if (strchr(str, '-') != NULL) { - DBG("utils_parse_time_suffix: invalid time string, should not contain '-'."); - ret = -1; - goto end; - } - - /* str_end will point to the \0 */ - str_end = str + strlen(str); - errno = 0; - base_time = strtoull(str, &num_end, 10); - if (errno != 0) { - PERROR("utils_parse_time_suffix strtoull on string \"%s\"", str); - ret = -1; - goto end; - } - - if (num_end == str) { - /* strtoull parsed nothing, not good. */ - DBG("utils_parse_time_suffix: strtoull had nothing good to parse."); - ret = -1; - goto end; - } - - /* Check if a prefix is present. */ - switch (*num_end) { - case 'u': - /* - * Microsecond (us) - * - * Skip the "us" if the string matches the "us" suffix, - * otherwise let the check for the end of the string handle - * the error reporting. - */ - if (*(num_end + 1) == 's') { - num_end += 2; - } - break; - case 'm': - if (*(num_end + 1) == 's') { - /* Millisecond (ms) */ - multiplier = USEC_PER_MSEC; - /* Skip the 's' */ - num_end++; - } else { - /* Minute (m) */ - multiplier = USEC_PER_MINUTE; - } - num_end++; - break; - case 's': - /* Second */ - multiplier = USEC_PER_SEC; - num_end++; - break; - case 'h': - /* Hour */ - multiplier = USEC_PER_HOURS; - num_end++; - break; - case '\0': - break; - default: - DBG("utils_parse_time_suffix: invalid suffix."); - ret = -1; - goto end; - } - - /* Check for garbage after the valid input. */ - if (num_end != str_end) { - DBG("utils_parse_time_suffix: Garbage after time string."); - ret = -1; - goto end; - } - - *time_us = base_time * multiplier; - - /* Check for overflow */ - if ((*time_us / multiplier) != base_time) { - DBG("utils_parse_time_suffix: oops, overflow detected."); - ret = -1; - goto end; - } - - ret = 0; -end: - return ret; -} - -/* - * fls: returns the position of the most significant bit. - * Returns 0 if no bit is set, else returns the position of the most - * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). - */ -#if defined(__i386) || defined(__x86_64) -static inline unsigned int fls_u32(uint32_t x) -{ - int r; - - asm("bsrl %1,%0\n\t" - "jnz 1f\n\t" - "movl $-1,%0\n\t" - "1:\n\t" - : "=r" (r) : "rm" (x)); - return r + 1; -} -#define HAS_FLS_U32 -#endif - -#if defined(__x86_64) && defined(__LP64__) -static inline -unsigned int fls_u64(uint64_t x) -{ - long r; - - asm("bsrq %1,%0\n\t" - "jnz 1f\n\t" - "movq $-1,%0\n\t" - "1:\n\t" - : "=r" (r) : "rm" (x)); - return r + 1; -} -#define HAS_FLS_U64 -#endif - -#ifndef HAS_FLS_U64 -static __attribute__((unused)) -unsigned int fls_u64(uint64_t x) -{ - unsigned int r = 64; - - if (!x) - return 0; - - if (!(x & 0xFFFFFFFF00000000ULL)) { - x <<= 32; - r -= 32; - } - if (!(x & 0xFFFF000000000000ULL)) { - x <<= 16; - r -= 16; - } - if (!(x & 0xFF00000000000000ULL)) { - x <<= 8; - r -= 8; - } - if (!(x & 0xF000000000000000ULL)) { - x <<= 4; - r -= 4; - } - if (!(x & 0xC000000000000000ULL)) { - x <<= 2; - r -= 2; - } - if (!(x & 0x8000000000000000ULL)) { - x <<= 1; - r -= 1; - } - return r; -} -#endif - -#ifndef HAS_FLS_U32 -static __attribute__((unused)) unsigned int fls_u32(uint32_t x) -{ - unsigned int r = 32; - - if (!x) { - return 0; - } - if (!(x & 0xFFFF0000U)) { - x <<= 16; - r -= 16; - } - if (!(x & 0xFF000000U)) { - x <<= 8; - r -= 8; - } - if (!(x & 0xF0000000U)) { - x <<= 4; - r -= 4; - } - if (!(x & 0xC0000000U)) { - x <<= 2; - r -= 2; - } - if (!(x & 0x80000000U)) { - x <<= 1; - r -= 1; - } - return r; -} -#endif - -/* - * Return the minimum order for which x <= (1UL << order). - * Return -1 if x is 0. - */ -LTTNG_HIDDEN -int utils_get_count_order_u32(uint32_t x) -{ - if (!x) { - return -1; - } - - return fls_u32(x - 1); -} - -/* - * Return the minimum order for which x <= (1UL << order). - * Return -1 if x is 0. - */ -LTTNG_HIDDEN -int utils_get_count_order_u64(uint64_t x) -{ - if (!x) { - return -1; - } - - return fls_u64(x - 1); -} - -/** - * Obtain the value of LTTNG_HOME environment variable, if exists. - * Otherwise returns the value of HOME. - */ -LTTNG_HIDDEN -const char *utils_get_home_dir(void) -{ - char *val = NULL; - struct passwd *pwd; - - val = lttng_secure_getenv(DEFAULT_LTTNG_HOME_ENV_VAR); - if (val != NULL) { - goto end; - } - val = lttng_secure_getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR); - if (val != NULL) { - goto end; - } - - /* Fallback on the password file entry. */ - pwd = getpwuid(getuid()); - if (!pwd) { - goto end; - } - val = pwd->pw_dir; - - DBG3("Home directory is '%s'", val); - -end: - return val; -} - -/** - * Get user's home directory. Dynamically allocated, must be freed - * by the caller. - */ -LTTNG_HIDDEN -char *utils_get_user_home_dir(uid_t uid) -{ - struct passwd pwd; - struct passwd *result; - char *home_dir = NULL; - char *buf = NULL; - long buflen; - int ret; - - buflen = sysconf(_SC_GETPW_R_SIZE_MAX); - if (buflen == -1) { - goto end; - } -retry: - buf = zmalloc(buflen); - if (!buf) { - goto end; - } - - ret = getpwuid_r(uid, &pwd, buf, buflen, &result); - if (ret || !result) { - if (ret == ERANGE) { - free(buf); - buflen *= 2; - goto retry; - } - goto end; - } - - home_dir = strdup(pwd.pw_dir); -end: - free(buf); - return home_dir; -} - -/* - * With the given format, fill dst with the time of len maximum siz. - * - * Return amount of bytes set in the buffer or else 0 on error. - */ -LTTNG_HIDDEN -size_t utils_get_current_time_str(const char *format, char *dst, size_t len) -{ - size_t ret; - time_t rawtime; - struct tm *timeinfo; - - assert(format); - assert(dst); - - /* Get date and time for session path */ - time(&rawtime); - timeinfo = localtime(&rawtime); - ret = strftime(dst, len, format, timeinfo); - if (ret == 0) { - ERR("Unable to strftime with format %s at dst %p of len %zu", format, - dst, len); - } - - return ret; -} - -/* - * Return 0 on success and set *gid to the group_ID matching the passed name. - * Else -1 if it cannot be found or an error occurred. - */ -LTTNG_HIDDEN -int utils_get_group_id(const char *name, bool warn, gid_t *gid) -{ - static volatile int warn_once; - int ret; - long sys_len; - size_t len; - struct group grp; - struct group *result; - struct lttng_dynamic_buffer buffer; - - /* Get the system limit, if it exists. */ - sys_len = sysconf(_SC_GETGR_R_SIZE_MAX); - if (sys_len == -1) { - len = 1024; - } else { - len = (size_t) sys_len; - } - - lttng_dynamic_buffer_init(&buffer); - ret = lttng_dynamic_buffer_set_size(&buffer, len); - if (ret) { - ERR("Failed to allocate group info buffer"); - ret = -1; - goto error; - } - - while ((ret = getgrnam_r(name, &grp, buffer.data, buffer.size, &result)) == ERANGE) { - const size_t new_len = 2 * buffer.size; - - /* Buffer is not big enough, increase its size. */ - if (new_len < buffer.size) { - ERR("Group info buffer size overflow"); - ret = -1; - goto error; - } - - ret = lttng_dynamic_buffer_set_size(&buffer, new_len); - if (ret) { - ERR("Failed to grow group info buffer to %zu bytes", - new_len); - ret = -1; - goto error; - } - } - if (ret) { - PERROR("Failed to get group file entry for group name \"%s\"", - name); - ret = -1; - goto error; - } - - /* Group not found. */ - if (!result) { - ret = -1; - goto error; - } - - *gid = result->gr_gid; - ret = 0; - -error: - if (ret && warn && !warn_once) { - WARN("No tracing group detected"); - warn_once = 1; - } - lttng_dynamic_buffer_reset(&buffer); - return ret; -} - -/* - * Return a newly allocated option string. This string is to be used as the - * optstring argument of getopt_long(), see GETOPT(3). opt_count is the number - * of elements in the long_options array. Returns NULL if the string's - * allocation fails. - */ -LTTNG_HIDDEN -char *utils_generate_optstring(const struct option *long_options, - size_t opt_count) -{ - int i; - size_t string_len = opt_count, str_pos = 0; - char *optstring; - - /* - * Compute the necessary string length. One letter per option, two when an - * argument is necessary, and a trailing NULL. - */ - for (i = 0; i < opt_count; i++) { - string_len += long_options[i].has_arg ? 1 : 0; - } - - optstring = zmalloc(string_len); - if (!optstring) { - goto end; - } - - for (i = 0; i < opt_count; i++) { - if (!long_options[i].name) { - /* Got to the trailing NULL element */ - break; - } - - if (long_options[i].val != '\0') { - optstring[str_pos++] = (char) long_options[i].val; - if (long_options[i].has_arg) { - optstring[str_pos++] = ':'; - } - } - } - -end: - return optstring; -} - -/* - * Try to remove a hierarchy of empty directories, recursively. Don't unlink - * any file. Try to rmdir any empty directory within the hierarchy. - */ -LTTNG_HIDDEN -int utils_recursive_rmdir(const char *path) -{ - int ret; - struct lttng_directory_handle *handle; - - handle = lttng_directory_handle_create(NULL); - if (!handle) { - ret = -1; - goto end; - } - ret = lttng_directory_handle_remove_subdirectory(handle, path); -end: - lttng_directory_handle_put(handle); - return ret; -} - -LTTNG_HIDDEN -int utils_truncate_stream_file(int fd, off_t length) -{ - int ret; - off_t lseek_ret; - - ret = ftruncate(fd, length); - if (ret < 0) { - PERROR("ftruncate"); - goto end; - } - lseek_ret = lseek(fd, length, SEEK_SET); - if (lseek_ret < 0) { - PERROR("lseek"); - ret = -1; - goto end; - } -end: - return ret; -} - -static const char *get_man_bin_path(void) -{ - char *env_man_path = lttng_secure_getenv(DEFAULT_MAN_BIN_PATH_ENV); - - if (env_man_path) { - return env_man_path; - } - - return DEFAULT_MAN_BIN_PATH; -} - -LTTNG_HIDDEN -int utils_show_help(int section, const char *page_name, - const char *help_msg) -{ - char section_string[8]; - const char *man_bin_path = get_man_bin_path(); - int ret = 0; - - if (help_msg) { - printf("%s", help_msg); - goto end; - } - - /* Section integer -> section string */ - ret = sprintf(section_string, "%d", section); - assert(ret > 0 && ret < 8); - - /* - * Execute man pager. - * - * We provide -M to man here because LTTng-tools can - * be installed outside /usr, in which case its man pages are - * not located in the default /usr/share/man directory. - */ - ret = execlp(man_bin_path, "man", "-M", MANPATH, - section_string, page_name, NULL); - -end: - return ret; -} - -static -int read_proc_meminfo_field(const char *field, size_t *value) -{ - int ret; - FILE *proc_meminfo; - char name[PROC_MEMINFO_FIELD_MAX_NAME_LEN] = {}; - - proc_meminfo = fopen(PROC_MEMINFO_PATH, "r"); - if (!proc_meminfo) { - PERROR("Failed to fopen() " PROC_MEMINFO_PATH); - ret = -1; - goto fopen_error; - } - - /* - * Read the contents of /proc/meminfo line by line to find the right - * field. - */ - while (!feof(proc_meminfo)) { - unsigned long value_kb; - - ret = fscanf(proc_meminfo, - "%" MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "s %lu kB\n", - name, &value_kb); - if (ret == EOF) { - /* - * fscanf() returning EOF can indicate EOF or an error. - */ - if (ferror(proc_meminfo)) { - PERROR("Failed to parse " PROC_MEMINFO_PATH); - } - break; - } - - if (ret == 2 && strcmp(name, field) == 0) { - /* - * This number is displayed in kilo-bytes. Return the - * number of bytes. - */ - *value = ((size_t) value_kb) * 1024; - ret = 0; - goto found; - } - } - /* Reached the end of the file without finding the right field. */ - ret = -1; - -found: - fclose(proc_meminfo); -fopen_error: - return ret; -} - -/* - * Returns an estimate of the number of bytes of memory available based on the - * the information in `/proc/meminfo`. The number returned by this function is - * a best guess. - */ -LTTNG_HIDDEN -int utils_get_memory_available(size_t *value) -{ - return read_proc_meminfo_field(PROC_MEMINFO_MEMAVAILABLE_LINE, value); -} - -/* - * Returns the total size of the memory on the system in bytes based on the - * the information in `/proc/meminfo`. - */ -LTTNG_HIDDEN -int utils_get_memory_total(size_t *value) -{ - return read_proc_meminfo_field(PROC_MEMINFO_MEMTOTAL_LINE, value); -} - -LTTNG_HIDDEN -int utils_change_working_directory(const char *path) -{ - int ret; - - assert(path); - - DBG("Changing working directory to \"%s\"", path); - ret = chdir(path); - if (ret) { - PERROR("Failed to change working directory to \"%s\"", path); - goto end; - } - - /* Check for write access */ - if (access(path, W_OK)) { - if (errno == EACCES) { - /* - * Do not treat this as an error since the permission - * might change in the lifetime of the process - */ - DBG("Working directory \"%s\" is not writable", path); - } else { - PERROR("Failed to check if working directory \"%s\" is writable", - path); - } - } - -end: - return ret; -}