X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Futils.c;h=38f78a7e8e7d40cd6fcebefd297e5bb240c52aaf;hb=cfa9a5a2b4a96e0d6a9eeddd2622a6d7c173b7ac;hp=54eed80bde14ad83228a090ce45638b0bba6c082;hpb=bc1822412cd0b91e16119ae75755ed4cd414d992;p=lttng-tools.git

diff --git a/src/common/utils.c b/src/common/utils.c
index 54eed80bd..38f78a7e8 100644
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -26,6 +26,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 #include <inttypes.h>
+#include <regex.h>
 
 #include <common/common.h>
 #include <common/runas.h>
@@ -313,7 +314,7 @@ 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;
+	int ret, out_fd, flags, mode;
 	char full_path[PATH_MAX], *path_name_id = NULL, *path;
 
 	assert(path_name);
@@ -341,9 +342,15 @@ int utils_create_stream_file(char *path_name, char *file_name, uint64_t size,
 		path = full_path;
 	}
 
+	flags = O_WRONLY | O_CREAT | O_TRUNC;
 	/* Open with 660 mode */
-	out_fd = run_as_open(path, O_WRONLY | O_CREAT | O_TRUNC,
-			S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP, uid, gid);
+	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;
@@ -388,3 +395,192 @@ int utils_rotate_stream_file(char *path_name, char *file_name, uint64_t size,
 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(&regex, "^\\(0x\\)\\{0,1\\}[0-9][0-9]*\\([kKMG]\\{0,1\\}\\)$", 0);
+	if (ret != 0) {
+		regex_print_error(ret, &regex);
+		ret = -1;
+		goto end;
+	}
+
+	/* Match regex */
+	ret = regexec(&regex, 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(&regex);
+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
+
+#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);
+}