X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Futils.c;h=dd9967312aca1be20253df8fd881c485858d0e6f;hp=f3718f00fa8ddabb7c921ac55287626dd83f45b8;hb=24bc0841bdd3fb38b76a9244d21f28000d653fcf;hpb=70d0b120691e90d81de7b38af8b845e261b5b40c diff --git a/src/common/utils.c b/src/common/utils.c index f3718f00f..dd9967312 100644 --- a/src/common/utils.c +++ b/src/common/utils.c @@ -22,8 +22,8 @@ #include #include #include -#include #include +#include #include #include #include @@ -32,6 +32,7 @@ #include #include "utils.h" +#include "defaults.h" /* * Return the realpath(3) of the path even if the last directory token does not @@ -141,6 +142,48 @@ 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. */ @@ -248,7 +291,6 @@ 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; @@ -276,15 +318,12 @@ int utils_mkdir_recursive(const char *path, mode_t mode) ret = -1; goto error; } - ret = stat(tmp, &statbuf); + ret = mkdir(tmp, mode); if (ret < 0) { - ret = mkdir(tmp, mode); - if (ret < 0) { - if (errno != EEXIST) { - PERROR("mkdir recursive"); - ret = -errno; - goto error; - } + if (errno != EEXIST) { + PERROR("mkdir recursive"); + ret = -errno; + goto error; } } *p = '/'; @@ -311,11 +350,12 @@ error: * 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 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, out_fd, flags, mode; - char full_path[PATH_MAX], *path_name_id = NULL, *path; + char full_path[PATH_MAX], *path_name_suffix = NULL, *path; + char *extra = NULL; assert(path_name); assert(file_name); @@ -327,17 +367,30 @@ int utils_create_stream_file(char *path_name, char *file_name, uint64_t size, goto error; } + /* Setup extra string if suffix or/and a count is needed. */ + if (size > 0 && suffix) { + ret = asprintf(&extra, "_%" PRIu64 "%s", count, suffix); + } else if (size > 0) { + ret = asprintf(&extra, "_%" PRIu64, count); + } else if (suffix) { + ret = asprintf(&extra, "%s", suffix); + } + if (ret < 0) { + PERROR("Allocating extra string to name"); + 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 (extra) { + ret = asprintf(&path_name_suffix, "%s%s", full_path, extra); if (ret < 0) { - PERROR("Allocating path name ID"); - goto error; + PERROR("Allocating path name with extra string"); + goto error_free_suffix; } - path = path_name_id; + path = path_name_suffix; } else { path = full_path; } @@ -358,7 +411,9 @@ int utils_create_stream_file(char *path_name, char *file_name, uint64_t size, ret = out_fd; error_open: - free(path_name_id); + free(path_name_suffix); +error_free_suffix: + free(extra); error: return ret; } @@ -374,10 +429,14 @@ error: */ 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) + uint64_t count, int uid, int gid, int out_fd, uint64_t *new_count, + int *stream_fd) { int ret; + assert(new_count); + assert(stream_fd); + ret = close(out_fd); if (ret < 0) { PERROR("Closing tracefile"); @@ -390,8 +449,16 @@ int utils_rotate_stream_file(char *path_name, char *file_name, uint64_t size, (*new_count)++; } - return utils_create_stream_file(path_name, file_name, size, *new_count, - uid, gid); + ret = utils_create_stream_file(path_name, file_name, size, *new_count, + uid, gid, 0); + if (ret < 0) { + goto error; + } + *stream_fd = ret; + + /* Success. */ + ret = 0; + error: return ret; } @@ -440,10 +507,11 @@ static void regex_print_error(int errcode, regex_t *regex) * * @param str The string to parse. * @param size Pointer to a size_t that will be filled with the - * resulting size. + * resulting size. * * @return 0 on success, -1 on failure. */ +LTTNG_HIDDEN int utils_parse_size_suffix(char *str, uint64_t *size) { regex_t regex; @@ -518,3 +586,111 @@ free: 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); +} + +/** + * Obtain the value of LTTNG_HOME environment variable, if exists. + * Otherwise returns the value of HOME. + */ +LTTNG_HIDDEN +char *utils_get_home_dir(void) +{ + char *val = NULL; + val = getenv(DEFAULT_LTTNG_HOME_ENV_VAR); + if (val != NULL) { + return val; + } + return getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR); +} + +/* + * 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 %lu", format, + dst, len); + } + + return ret; +}