Ltrace

Description

ltrace traces the calls to the library functions.

Usage

Syntax

ltrace [option ...] [command [arg ...]]

Options

-a, --align=COLUMN

align return values in a secific column.

-A MAXELTS

maximum number of array elements to print.

-b, --no-signals

don't print signals.

-c

count time and calls, and report a summary on exit.

-C, --demangle

decode low-level symbol names into user-level names.

-D, --debug=MASK

enable debugging (see -Dh or --debug=help).

-Dh, --debug=help

show help on debugging.

-e FILTER

modify which library calls to trace.

-f

trace children (fork() and clone()).

-F, --config=FILE

load alternate configuration file (may be repeated).

-h, --help

display this help and exit.

-i

print instruction pointer at time of library call.

-l, --library=LIBRARY_PATTERN

only trace symbols implemented by this library.

-L

do NOT display library calls.

-n, --indent=NR

indent output by NR spaces for each call level nesting.

-o, --output=FILENAME

write the trace output to file with given name.

-p PID

attach to the process with the process ID pid.

-r

print relative timestamps.

-s STRSIZE

specify the maximum string size to print.

-S

trace system calls as well as library calls.

-t, -tt, -ttt

print absolute timestamps.

-T

show the time spent inside each call.

-u USERNAME

run command with the userid, groupid of username.

-V, --version

output version information and exit.

-x FILTER

modify which static functions to trace.

Usage example

$ ltrace ls
__libc_start_main(0x4028a0, 1, 0x7ffd448d7c58, 0x4124f0 <unfinished ...>
strrchr("ls", '/')                                                      = nil
setlocale(LC_ALL, "")                                                   = "fr_FR.UTF-8"
bindtextdomain("coreutils", "/usr/share/locale")                        = "/usr/share/locale"
textdomain("coreutils")                                                 = "coreutils"
__cxa_atexit(0x40a1c0, 0, 0, 0x736c6974756572)                          = 0
isatty(1)                                                               = 1
getenv("QUOTING_STYLE")                                                 = nil
getenv("COLUMNS")                                                       = nil
ioctl(1, 21523, 0x7ffd448d77f0)                                         = 0
getenv("TABSIZE")                                                       = nil
getopt_long(1, 0x7ffd448d7c58, "abcdfghiklmnopqrstuvw:xABCDFGHI:"..., 0x413740, -1) = -1
getenv("LS_BLOCK_SIZE")                                                 = nil
getenv("BLOCK_SIZE")                                                    = nil
getenv("BLOCKSIZE")                                                     = nil
getenv("POSIXLY_CORRECT")                                               = nil
getenv("BLOCK_SIZE")                                                    = nil
__errno_location()                                                      = 0x7f087563c6b0
malloc(56)                                                              = 0xb9d040
memcpy(0xb9d040, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 56) = 0xb9d040
__errno_location()                                                      = 0x7f087563c6b0
malloc(56)                                                              = 0xb9d080
memcpy(0xb9d080, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 56) = 0xb9d080
malloc(19200)                                                           = 0xb9d0c0
malloc(32)                                                              = 0xba1bd0
strlen(".")                                                             = 1
malloc(2)                                                               = 0xba1c00
memcpy(0xba1c00, ".\0", 2)                                              = 0xba1c00
__errno_location()                                                      = 0x7f087563c6b0
opendir(".")                                                            = 0xba1c20
readdir(0xba1c20)                                                       = 0xba1c50
strlen("e7bc5d2c0cf4480348f5504196561297"...)                           = 32
malloc(33)                                                              = 0xba9c60
memcpy(0xba9c60, "e7bc5d2c0cf4480348f5504196561297"..., 33)             = 0xba9c60
readdir(0xba1c20)                                                       = 0xba1c88
readdir(0xba1c20)                                                       = 0xba1ca0
readdir(0xba1c20)                                                       = 0
closedir(0xba1c20)                                                      = 0
free(0)                                                                 = <void>
malloc(24)                                                              = 0xba1c20
_setjmp(0x61c700, 0x400000, 0xb9d180, 0xba1c20)                         = 0
realloc(0, 48)                                                          = 0xba1c40
malloc(24)                                                              = 0xba1c80
__errno_location()                                                      = 0x7f087563c6b0
__ctype_get_mb_cur_max()                                                = 6
__ctype_get_mb_cur_max()                                                = 6
__errno_location()                                                      = 0x7f087563c6b0
__ctype_get_mb_cur_max()                                                = 6
__ctype_get_mb_cur_max()                                                = 6
__errno_location()                                                      = 0x7f087563c6b0
__ctype_get_mb_cur_max()                                                = 6
__ctype_get_mb_cur_max()                                                = 6
fwrite_unlocked("e7bc5d2c0cf4480348f5504196561297"..., 1, 32, 0x7f0874ff82a0) = 32
__overflow(0x7f0874ff82a0, 10, 0x7f087564801f, 0xfbad2a84e7bc5d2c0cf4480348f5504196561297
)              = 10
free(0xba1c00)                                                          = <void>
free(0)                                                                 = <void>
free(0xba1bd0)                                                          = <void>
exit(0 <unfinished ...>
__fpending(0x7f0874ff82a0, 0, 64, 0x7f0874ff8c90)                       = 0
fileno(0x7f0874ff82a0)                                                  = 1
__freading(0x7f0874ff82a0, 0, 64, 0x7f0874ff8c90)                       = 0
__freading(0x7f0874ff82a0, 0, 2052, 0x7f0874ff8c90)                     = 0
fflush(0x7f0874ff82a0)                                                  = 0
fclose(0x7f0874ff82a0)                                                  = 0
__fpending(0x7f0874ff8060, 0, 0x7f0874ff9700, 0xfbad000c)               = 0
fileno(0x7f0874ff8060)                                                  = 2
__freading(0x7f0874ff8060, 0, 0x7f0874ff9700, 0xfbad000c)               = 0
__freading(0x7f0874ff8060, 0, 4, 0xfbad000c)                            = 0
fflush(0x7f0874ff8060)                                                  = 0
fclose(0x7f0874ff8060)                                                  = 0
+++ exited (status 0) +++