/*
- * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
- * Copyright (C) 2013 - Raphaël Beamonte <raphael.beamonte@gmail.com>
- * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
*
- * 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.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
- * 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.
*/
+#include "common/macros.h"
+#include <stdint.h>
#define _LGPL_SOURCE
#include <assert.h>
#include <ctype.h>
#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;
-}
+#define FALLBACK_USER_BUFLEN 16384
+#define FALLBACK_GROUP_BUFLEN 16384
-/*
- * 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.
- */
-LTTNG_HIDDEN
-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);
- }
-
- 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.
*/
if (ret) {
PERROR("close pipe");
}
+ src[i] = -1;
}
}
LTTNG_HIDDEN
int utils_create_pid_file(pid_t pid, const char *filepath)
{
- int ret;
- FILE *fp;
+ int ret, fd = -1;
+ FILE *fp = NULL;
assert(filepath);
- fp = fopen(filepath, "w");
+ fd = open(filepath, O_CREAT | O_WRONLY, S_IRUSR |S_IWUSR | S_IRGRP | S_IROTH);
+ if (fd < 0) {
+ PERROR("open file %s", filepath);
+ ret = -1;
+ goto error;
+ }
+
+ fp = fdopen(fd, "w");
if (fp == NULL) {
- PERROR("open pid file %s", filepath);
+ PERROR("fdopen file %s", filepath);
ret = -1;
+ close(fd);
goto error;
}
ret = fprintf(fp, "%d\n", (int) pid);
if (ret < 0) {
- PERROR("fprintf pid file");
+ PERROR("fprintf file %s", filepath);
+ ret = -1;
goto error;
}
- if (fclose(fp)) {
- PERROR("fclose");
- }
- DBG("Pid %d written in file %s", (int) pid, filepath);
+ DBG("'%d' written in file %s", (int) pid, filepath);
ret = 0;
+
error:
+ if (fp && fclose(fp)) {
+ PERROR("fclose file %s", filepath);
+ }
return ret;
}
int utils_mkdir(const char *path, mode_t mode, int uid, int gid)
{
int ret;
- struct lttng_directory_handle handle;
+ struct lttng_directory_handle *handle;
const struct lttng_credentials creds = {
- .uid = (uid_t) uid,
- .gid = (gid_t) gid,
+ .uid = LTTNG_OPTIONAL_INIT_VALUE(uid),
+ .gid = LTTNG_OPTIONAL_INIT_VALUE(gid),
};
- ret = lttng_directory_handle_init(&handle, NULL);
- if (ret) {
+ handle = lttng_directory_handle_create(NULL);
+ if (!handle) {
+ ret = -1;
goto end;
}
ret = lttng_directory_handle_create_subdirectory_as_user(
- &handle, path, mode,
+ handle, path, mode,
(uid >= 0 || gid >= 0) ? &creds : NULL);
- lttng_directory_handle_fini(&handle);
end:
+ lttng_directory_handle_put(handle);
return ret;
}
int utils_mkdir_recursive(const char *path, mode_t mode, int uid, int gid)
{
int ret;
- struct lttng_directory_handle handle;
+ struct lttng_directory_handle *handle;
const struct lttng_credentials creds = {
- .uid = (uid_t) uid,
- .gid = (gid_t) gid,
+ .uid = LTTNG_OPTIONAL_INIT_VALUE(uid),
+ .gid = LTTNG_OPTIONAL_INIT_VALUE(gid),
};
- ret = lttng_directory_handle_init(&handle, NULL);
- if (ret) {
+ handle = lttng_directory_handle_create(NULL);
+ if (!handle) {
+ ret = -1;
goto end;
}
ret = lttng_directory_handle_create_subdirectory_recursive_as_user(
- &handle, path, mode,
+ handle, path, mode,
(uid >= 0 || gid >= 0) ? &creds : NULL);
- lttng_directory_handle_fini(&handle);
end:
+ lttng_directory_handle_put(handle);
return ret;
}
char *out_stream_path, size_t stream_path_len)
{
int ret;
- char count_str[MAX_INT_DEC_LEN(count) + 1] = {};
+ char count_str[MAX_INT_DEC_LEN(count) + 1] = {};
const char *path_separator;
- if (path_name && path_name[strlen(path_name) - 1] == '/') {
+ if (path_name && (path_name[0] == '\0' ||
+ path_name[strlen(path_name) - 1] == '/')) {
path_separator = "";
} else {
path_separator = "/";
assert(ret > 0 && ret < sizeof(count_str));
}
- ret = snprintf(out_stream_path, stream_path_len, "%s%s%s%s%s",
+ 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) {
return ret;
}
-/*
- * Create the stream file on disk.
- *
- * Return 0 on success or else a negative value.
- */
-LTTNG_HIDDEN
-int utils_create_stream_file(const char *path_name, char *file_name, uint64_t size,
- uint64_t count, int uid, int gid, char *suffix)
-{
- int ret, flags, mode;
- char path[LTTNG_PATH_MAX];
-
- ret = utils_stream_file_path(path_name, file_name,
- size, count, suffix, path, sizeof(path));
- if (ret < 0) {
- goto error;
- }
-
- /*
- * With the session rotation feature on the relay, we might need to seek
- * and truncate a tracefile, so we need read and write access.
- */
- flags = O_RDWR | O_CREAT | O_TRUNC;
- /* Open with 660 mode */
- mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
-
- if (uid < 0 || gid < 0) {
- ret = open(path, flags, mode);
- } else {
- ret = run_as_open(path, flags, mode, uid, gid);
- }
- if (ret < 0) {
- PERROR("open stream path %s", path);
- }
-error:
- return ret;
-}
-
-/*
- * Unlink the stream tracefile from disk.
- *
- * Return 0 on success or else a negative value.
- */
-LTTNG_HIDDEN
-int utils_unlink_stream_file(const char *path_name, char *file_name, uint64_t size,
- uint64_t count, int uid, int gid, char *suffix)
-{
- int ret;
- char path[LTTNG_PATH_MAX];
-
- ret = utils_stream_file_path(path_name, file_name, size, count, suffix,
- path, sizeof(path));
- if (ret < 0) {
- goto error;
- }
- if (uid < 0 || gid < 0) {
- ret = unlink(path);
- } else {
- ret = run_as_unlink(path, uid, gid);
- }
- if (ret < 0) {
- goto error;
- }
-error:
- DBG("utils_unlink_stream_file %s returns %d", path, ret);
- return ret;
-}
-
-/*
- * Change the output tracefile according to the given size and count The
- * new_count pointer is set during this operation.
- *
- * From the consumer, the stream lock MUST be held before calling this function
- * because we are modifying the stream status.
- *
- * Return 0 on success or else a negative value.
- */
-LTTNG_HIDDEN
-int utils_rotate_stream_file(char *path_name, char *file_name, uint64_t size,
- uint64_t count, int uid, int gid, int out_fd, uint64_t *new_count,
- int *stream_fd)
-{
- int ret;
-
- assert(stream_fd);
-
- ret = close(out_fd);
- if (ret < 0) {
- PERROR("Closing tracefile");
- goto error;
- }
- *stream_fd = -1;
-
- if (count > 0) {
- /*
- * In tracefile rotation, for the relay daemon we need
- * to unlink the old file if present, because it may
- * still be open in reading by the live thread, and we
- * need to ensure that we do not overwrite the content
- * between get_index and get_packet. Since we have no
- * way to verify integrity of the data content compared
- * to the associated index, we need to ensure the reader
- * has exclusive access to the file content, and that
- * the open of the data file is performed in get_index.
- * Unlinking the old file rather than overwriting it
- * achieves this.
- */
- if (new_count) {
- *new_count = (*new_count + 1) % count;
- }
- ret = utils_unlink_stream_file(path_name, file_name, size,
- new_count ? *new_count : 0, uid, gid, 0);
- if (ret < 0 && errno != ENOENT) {
- goto error;
- }
- } else {
- if (new_count) {
- (*new_count)++;
- }
- }
-
- ret = utils_create_stream_file(path_name, file_name, size,
- new_count ? *new_count : 0, uid, gid, 0);
- if (ret < 0) {
- goto error;
- }
- *stream_fd = ret;
-
- /* Success. */
- ret = 0;
-
-error:
- return ret;
-}
-
-
/**
* Parse a string that represents a size in human readable format. It
* supports decimal integers suffixed by 'k', 'K', 'M' or 'G'.
#define HAS_FLS_U32
#endif
-#if defined(__x86_64)
+#if defined(__x86_64) && defined(__LP64__)
static inline
unsigned int fls_u64(uint64_t x)
{
* Otherwise returns the value of HOME.
*/
LTTNG_HIDDEN
-char *utils_get_home_dir(void)
+const char *utils_get_home_dir(void)
{
char *val = NULL;
struct passwd *pwd;
}
}
if (ret) {
- PERROR("Failed to get group file entry for group name \"%s\"",
- name);
+ if (ret == ESRCH) {
+ DBG("Could not find group file entry for group name '%s'",
+ name);
+ } else {
+ PERROR("Failed to get group file entry for group name '%s'",
+ name);
+ }
+
ret = -1;
goto error;
}
int utils_recursive_rmdir(const char *path)
{
int ret;
- struct lttng_directory_handle handle;
+ struct lttng_directory_handle *handle;
- ret = lttng_directory_handle_init(&handle, NULL);
- if (ret) {
+ handle = lttng_directory_handle_create(NULL);
+ if (!handle) {
+ ret = -1;
goto end;
}
- ret = lttng_directory_handle_remove_subdirectory(&handle, path);
- lttng_directory_handle_fini(&handle);
+ ret = lttng_directory_handle_remove_subdirectory(handle, path);
end:
+ lttng_directory_handle_put(handle);
return ret;
}
}
static
-int read_proc_meminfo_field(const char *field, size_t *value)
+int read_proc_meminfo_field(const char *field, uint64_t *value)
{
int ret;
FILE *proc_meminfo;
* field.
*/
while (!feof(proc_meminfo)) {
- unsigned long value_kb;
+ uint64_t value_kb;
ret = fscanf(proc_meminfo,
- "%" MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "s %lu kB\n",
+ "%" MAX_NAME_LEN_SCANF_IS_A_BROKEN_API "s %" SCNu64 " kB\n",
name, &value_kb);
if (ret == EOF) {
/*
* This number is displayed in kilo-bytes. Return the
* number of bytes.
*/
- *value = ((size_t) value_kb) * 1024;
+ if (value_kb > UINT64_MAX / 1024) {
+ ERR("Overflow on kb to bytes conversion");
+ break;
+ }
+
+ *value = value_kb * 1024;
ret = 0;
goto found;
}
* a best guess.
*/
LTTNG_HIDDEN
-int utils_get_memory_available(size_t *value)
+int utils_get_memory_available(uint64_t *value)
{
return read_proc_meminfo_field(PROC_MEMINFO_MEMAVAILABLE_LINE, value);
}
* the information in `/proc/meminfo`.
*/
LTTNG_HIDDEN
-int utils_get_memory_total(size_t *value)
+int utils_get_memory_total(uint64_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;
+}
+
+LTTNG_HIDDEN
+enum lttng_error_code utils_user_id_from_name(const char *user_name, uid_t *uid)
+{
+ struct passwd p, *pres;
+ int ret;
+ enum lttng_error_code ret_val = LTTNG_OK;
+ char *buf = NULL;
+ ssize_t buflen;
+
+ buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
+ if (buflen < 0) {
+ buflen = FALLBACK_USER_BUFLEN;
+ }
+
+ buf = zmalloc(buflen);
+ if (!buf) {
+ ret_val = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ for (;;) {
+ ret = getpwnam_r(user_name, &p, buf, buflen, &pres);
+ switch (ret) {
+ case EINTR:
+ continue;
+ case ERANGE:
+ buflen *= 2;
+ free(buf);
+ buf = zmalloc(buflen);
+ if (!buf) {
+ ret_val = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ continue;
+ default:
+ goto end_loop;
+ }
+ }
+end_loop:
+
+ switch (ret) {
+ case 0:
+ if (pres == NULL) {
+ ret_val = LTTNG_ERR_USER_NOT_FOUND;
+ } else {
+ *uid = p.pw_uid;
+ DBG("Lookup of tracker UID/VUID: name '%s' maps to uid %" PRId64,
+ user_name, (int64_t) *uid);
+ ret_val = LTTNG_OK;
+ }
+ break;
+ case ENOENT:
+ case ESRCH:
+ case EBADF:
+ case EPERM:
+ ret_val = LTTNG_ERR_USER_NOT_FOUND;
+ break;
+ default:
+ ret_val = LTTNG_ERR_NOMEM;
+ }
+end:
+ free(buf);
+ return ret_val;
+}
+
+LTTNG_HIDDEN
+enum lttng_error_code utils_group_id_from_name(
+ const char *group_name, gid_t *gid)
+{
+ struct group g, *gres;
+ int ret;
+ enum lttng_error_code ret_val = LTTNG_OK;
+ char *buf = NULL;
+ ssize_t buflen;
+
+ buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+ if (buflen < 0) {
+ buflen = FALLBACK_GROUP_BUFLEN;
+ }
+
+ buf = zmalloc(buflen);
+ if (!buf) {
+ ret_val = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ for (;;) {
+ ret = getgrnam_r(group_name, &g, buf, buflen, &gres);
+ switch (ret) {
+ case EINTR:
+ continue;
+ case ERANGE:
+ buflen *= 2;
+ free(buf);
+ buf = zmalloc(buflen);
+ if (!buf) {
+ ret_val = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ continue;
+ default:
+ goto end_loop;
+ }
+ }
+end_loop:
+
+ switch (ret) {
+ case 0:
+ if (gres == NULL) {
+ ret_val = LTTNG_ERR_GROUP_NOT_FOUND;
+ } else {
+ *gid = g.gr_gid;
+ DBG("Lookup of tracker GID/GUID: name '%s' maps to gid %" PRId64,
+ group_name, (int64_t) *gid);
+ ret_val = LTTNG_OK;
+ }
+ break;
+ case ENOENT:
+ case ESRCH:
+ case EBADF:
+ case EPERM:
+ ret_val = LTTNG_ERR_GROUP_NOT_FOUND;
+ break;
+ default:
+ ret_val = LTTNG_ERR_NOMEM;
+ }
+end:
+ free(buf);
+ return ret_val;
+}
+
+LTTNG_HIDDEN
+int utils_parse_unsigned_long_long(const char *str,
+ unsigned long long *value)
+{
+ int ret;
+ char *endptr;
+
+ assert(str);
+ assert(value);
+
+ errno = 0;
+ *value = strtoull(str, &endptr, 10);
+
+ /* Conversion failed. Out of range? */
+ if (errno != 0) {
+ /* Don't print an error; allow the caller to log a better error. */
+ DBG("Failed to parse string as unsigned long long number: string = '%s', errno = %d",
+ str, errno);
+ ret = -1;
+ goto end;
+ }
+
+ /* Not the end of the string or empty string. */
+ if (*endptr || endptr == str) {
+ DBG("Failed to parse string as unsigned long long number: string = '%s'",
+ str);
+ ret = -1;
+ goto end;
+ }
+
+ ret = 0;
+
+end:
+ return ret;
+}
projects / lttng-tools.git / blobdiff