X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fcommon%2Futils.c;h=f1e0148cb9cb9cd28159846141a99fc108b95a58;hb=d73bf3d793ee0b0c5b56cb47cb50c27d1789d3bd;hp=d71d92446ce71e14177e26005797211c4f7f0730;hpb=93ec662e687dc15a3601704a1e0c96c51ad228c9;p=lttng-tools.git

diff --git a/src/common/utils.c b/src/common/utils.c
index d71d92446..f1e0148cb 100644
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -189,6 +189,10 @@ char *utils_partial_realpath(const char *path, char *resolved_path, size_t size)
 error:
 	free(resolved_path);
 	free(cut_path);
+	free(try_path);
+	if (try_path_prev != try_path) {
+		free(try_path_prev);
+	}
 	return NULL;
 }
 
@@ -524,7 +528,7 @@ int utils_create_lock_file(const char *filepath)
 		S_IRGRP | S_IWGRP);
 	if (fd < 0) {
 		PERROR("open lock file %s", filepath);
-		ret = -1;
+		fd = -1;
 		goto error;
 	}
 
@@ -781,7 +785,11 @@ int utils_create_stream_file(const char *path_name, char *file_name, uint64_t si
 		goto error;
 	}
 
-	flags = O_WRONLY | O_CREAT | O_TRUNC;
+	/*
+	 * 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;
 
@@ -850,6 +858,7 @@ int utils_rotate_stream_file(char *path_name, char *file_name, uint64_t size,
 		PERROR("Closing tracefile");
 		goto error;
 	}
+	*stream_fd = -1;
 
 	if (count > 0) {
 		/*
@@ -1012,6 +1021,59 @@ static inline unsigned int fls_u32(uint32_t x)
 #define HAS_FLS_U32
 #endif
 
+#if defined(__x86_64)
+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)
 {
@@ -1058,6 +1120,20 @@ int utils_get_count_order_u32(uint32_t x)
 	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.
@@ -1130,26 +1206,6 @@ end:
 	return home_dir;
 }
 
-/*
- * Obtain the value of LTTNG_KMOD_PROBES environment variable, if exists.
- * Otherwise returns NULL.
- */
-LTTNG_HIDDEN
-char *utils_get_kmod_probes_list(void)
-{
-	return lttng_secure_getenv(DEFAULT_LTTNG_KMOD_PROBES);
-}
-
-/*
- * Obtain the value of LTTNG_EXTRA_KMOD_PROBES environment variable, if
- * exists. Otherwise returns NULL.
- */
-LTTNG_HIDDEN
-char *utils_get_extra_kmod_probes_list(void)
-{
-	return lttng_secure_getenv(DEFAULT_LTTNG_EXTRA_KMOD_PROBES);
-}
-
 /*
  * With the given format, fill dst with the time of len maximum siz.
  *
@@ -1341,6 +1397,47 @@ int utils_truncate_stream_file(int fd, off_t length)
 		PERROR("lseek");
 		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;