*/
#define _GNU_SOURCE
+#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <regex.h>
#include <common/common.h>
+#include <common/runas.h>
#include "utils.h"
* /tmp/test1 does, the real path is returned. In normal time, realpath(3)
* fails if the end point directory does not exist.
*/
+LTTNG_HIDDEN
char *utils_expand_path(const char *path)
{
const char *end_path = path;
}
/* Add end part to expanded path */
- strncat(expanded_path, end_path, PATH_MAX);
+ strncat(expanded_path, end_path, PATH_MAX - strlen(expanded_path) - 1);
free(cut_path);
return expanded_path;
/*
* Create a pipe in dst.
*/
+LTTNG_HIDDEN
int utils_create_pipe(int *dst)
{
int ret;
* 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;
/*
* Close both read and write side of the pipe.
*/
+LTTNG_HIDDEN
void utils_close_pipe(int *src)
{
int i, ret;
}
}
}
+
+/*
+ * 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", pid);
+ if (ret < 0) {
+ PERROR("fprintf pid file");
+ }
+
+ fclose(fp);
+ DBG("Pid %d written in file %s", pid, filepath);
+error:
+ return ret;
+}
+
+/*
+ * Recursively create directory using the given path and mode.
+ *
+ * On success, return 0 else a negative error code.
+ */
+LTTNG_HIDDEN
+int utils_mkdir_recursive(const char *path, mode_t mode)
+{
+ char *p, tmp[PATH_MAX];
+ struct stat statbuf;
+ size_t len;
+ int ret;
+
+ assert(path);
+
+ ret = snprintf(tmp, sizeof(tmp), "%s", path);
+ if (ret < 0) {
+ PERROR("snprintf mkdir");
+ goto error;
+ }
+
+ len = ret;
+ if (tmp[len - 1] == '/') {
+ tmp[len - 1] = 0;
+ }
+
+ for (p = tmp + 1; *p; p++) {
+ if (*p == '/') {
+ *p = 0;
+ if (tmp[strlen(tmp) - 1] == '.' &&
+ tmp[strlen(tmp) - 2] == '.' &&
+ tmp[strlen(tmp) - 3] == '/') {
+ ERR("Using '/../' is not permitted in the trace path (%s)",
+ tmp);
+ ret = -1;
+ goto error;
+ }
+ ret = stat(tmp, &statbuf);
+ if (ret < 0) {
+ ret = mkdir(tmp, mode);
+ if (ret < 0) {
+ if (errno != EEXIST) {
+ PERROR("mkdir recursive");
+ ret = -errno;
+ goto error;
+ }
+ }
+ }
+ *p = '/';
+ }
+ }
+
+ ret = mkdir(tmp, mode);
+ if (ret < 0) {
+ if (errno != EEXIST) {
+ PERROR("mkdir recursive last piece");
+ ret = -errno;
+ } else {
+ ret = 0;
+ }
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Create the stream tracefile on disk.
+ *
+ * Return 0 on success or else a negative value.
+ */
+LTTNG_HIDDEN
+int utils_create_stream_file(char *path_name, char *file_name, uint64_t size,
+ uint64_t count, int uid, int gid)
+{
+ int ret, out_fd, flags, mode;
+ char full_path[PATH_MAX], *path_name_id = NULL, *path;
+
+ assert(path_name);
+ assert(file_name);
+
+ ret = snprintf(full_path, sizeof(full_path), "%s/%s",
+ path_name, file_name);
+ if (ret < 0) {
+ PERROR("snprintf create output file");
+ goto error;
+ }
+
+ /*
+ * If we split the trace in multiple files, we have to add the count at the
+ * end of the tracefile name
+ */
+ if (size > 0) {
+ ret = asprintf(&path_name_id, "%s_%" PRIu64, full_path, count);
+ if (ret < 0) {
+ PERROR("Allocating path name ID");
+ goto error;
+ }
+ path = path_name_id;
+ } else {
+ path = full_path;
+ }
+
+ flags = O_WRONLY | O_CREAT | O_TRUNC;
+ /* Open with 660 mode */
+ mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
+
+ if (uid < 0 || gid < 0) {
+ out_fd = open(path, flags, mode);
+ } else {
+ out_fd = run_as_open(path, flags, mode, uid, gid);
+ }
+ if (out_fd < 0) {
+ PERROR("open stream path %s", path);
+ goto error_open;
+ }
+ ret = out_fd;
+
+error_open:
+ free(path_name_id);
+error:
+ 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 ret;
+
+ ret = close(out_fd);
+ if (ret < 0) {
+ PERROR("Closing tracefile");
+ goto error;
+ }
+
+ if (count > 0) {
+ *new_count = (*new_count + 1) % count;
+ } else {
+ (*new_count)++;
+ }
+
+ return utils_create_stream_file(path_name, file_name, size, *new_count,
+ uid, gid);
+error:
+ return ret;
+}
+
+/**
+ * Prints the error message corresponding to a regex error code.
+ *
+ * @param errcode The error code.
+ * @param regex The regex object that produced the error code.
+ */
+static void regex_print_error(int errcode, regex_t *regex)
+{
+ /* Get length of error message and allocate accordingly */
+ size_t length;
+ char *buffer;
+
+ assert(regex != NULL);
+
+ length = regerror(errcode, regex, NULL, 0);
+ if (length == 0) {
+ ERR("regerror returned a length of 0");
+ return;
+ }
+
+ buffer = zmalloc(length);
+ if (!buffer) {
+ ERR("regex_print_error: zmalloc failed");
+ return;
+ }
+
+ /* Get and print error message */
+ regerror(errcode, regex, buffer, length);
+ ERR("regex error: %s\n", buffer);
+ free(buffer);
+
+}
+
+/**
+ * Parse a string that represents a size in human readable format. It
+ * supports decimal integers suffixed by '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 size_t that will be filled with the
+ * resulting size.
+ *
+ * @return 0 on success, -1 on failure.
+ */
+int utils_parse_size_suffix(char *str, uint64_t *size)
+{
+ regex_t regex;
+ int ret;
+ const int nmatch = 3;
+ regmatch_t suffix_match, matches[nmatch];
+ unsigned long long base_size;
+ long shift = 0;
+
+ if (!str) {
+ return 0;
+ }
+
+ /* Compile regex */
+ ret = regcomp(®ex, "^\\(0x\\)\\{0,1\\}[0-9][0-9]*\\([kKMG]\\{0,1\\}\\)$", 0);
+ if (ret != 0) {
+ regex_print_error(ret, ®ex);
+ ret = -1;
+ goto end;
+ }
+
+ /* Match regex */
+ ret = regexec(®ex, str, nmatch, matches, 0);
+ if (ret != 0) {
+ ret = -1;
+ goto free;
+ }
+
+ /* There is a match ! */
+ errno = 0;
+ base_size = strtoull(str, NULL, 0);
+ if (errno != 0) {
+ PERROR("strtoull");
+ ret = -1;
+ goto free;
+ }
+
+ /* Check if there is a suffix */
+ suffix_match = matches[2];
+ if (suffix_match.rm_eo - suffix_match.rm_so == 1) {
+ switch (*(str + suffix_match.rm_so)) {
+ case 'K':
+ case 'k':
+ shift = KIBI_LOG2;
+ break;
+ case 'M':
+ shift = MEBI_LOG2;
+ break;
+ case 'G':
+ shift = GIBI_LOG2;
+ break;
+ default:
+ ERR("parse_human_size: invalid suffix");
+ ret = -1;
+ goto free;
+ }
+ }
+
+ *size = base_size << shift;
+
+ /* Check for overflow */
+ if ((*size >> shift) != base_size) {
+ ERR("parse_size_suffix: oops, overflow detected.");
+ ret = -1;
+ goto free;
+ }
+
+ ret = 0;
+
+free:
+ regfree(®ex);
+end:
+ return ret;
+}
projects / lttng-tools.git / blobdiff