Loading AI tools
Unix programming tool From Wikipedia, the free encyclopedia
ltrace is a debugging utility in Linux, used to display the calls a userspace application makes to shared libraries. It does this by hooking into the dynamic loading system, allowing it to insert shims which display the parameters which the applications uses when making the call, and the return value which the library call reports. ltrace can also trace Linux system calls. Because it uses the dynamic library hooking mechanism, ltrace cannot trace calls to libraries which are statically linked directly to the target binary. Since 0.7.3, ltrace can also trace calls to libraries which are loaded using dlopen.
![]() | This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages)
|
The following is the first few lines of an invocation of xterm. It shows ltrace displaying calls to a variety of libraries, including the C standard library (malloc, strlen), POSIX libraries (getuid), X Toolkit Intrinsics (XtOpenApplication), and the X11 inter-client communication library (IceAddConnectionWatch). A call's return value is shown after the = symbol.
[pid 11783] __libc_start_main(0x407420, 1, 0x7fff75b6aad8, 0x443cc0, 0x443d50 <unfinished ...>
[pid 11783] geteuid() = 1000
[pid 11783] getegid() = 1000
[pid 11783] getuid() = 1000
[pid 11783] getgid() = 1000
[pid 11783] setuid(1000) = 0
[pid 11783] malloc(91) = 0x00cf8010
[pid 11783] XtSetLanguageProc(0, 0, 0, 0x7f968c9a3740, 1) = 0x7f968bc16220
[pid 11783] ioctl(0, 21505, 0x7fff75b6a960) = 0
[pid 11783] XtSetErrorHandler(0x42bbb0, 0x44f99c, 0x669f80, 146, 0x7fff75b6a72c) = 0
[pid 11783] XtOpenApplication(0x670260, 0x44f99c, 0x669f80, 146, 0x7fff75b6a72c) = 0xd219a0
[pid 11783] IceAddConnectionWatch(0x42adc0, 0, 0, 0x7f968c9a3748, 0 <unfinished ...>
[pid 11783] IceConnectionNumber(0xd17ec0, 0, 1, 0xcfb138, 0xd17c00) = 4
[pid 11783] <... IceAddConnectionWatch resumed> ) = 1
[pid 11783] XtSetErrorHandler(0, 0, 1, 0xcfb138, 0xd17c00) = 0
[pid 11783] XtGetApplicationResources(0xd219a0, 0x6701c0, 0x66b220, 34, 0) = 0
[pid 11783] strlen("off") = 3
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.