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Updated ltrace packages that fix multiple bugs and add one enhancement are now available for Red Hat Enterprise Linux 6.
The ltrace utility is a debugging program that runs a specified command until the command exits. While the command is executing, ltrace intercepts and records both the dynamic library calls called by the executed process and the signals received by the executed process. The ltrace utility can also intercept and print system calls executed by the process.
- Prior to this update, a traced process that had more than one thread could be aborted if the threads ran into breakpoints which the ltrace utility did not handle. With this update, ltrace attaches to the newly created threads, and carefully handles the breakpoints so that tracing events are not missed. This update also improves the detach logic so that a running process to which ltrace has been attached is left in a consistent state before detaching.
- Prior to this update, the ltrace utility could, under certain circumstances, fail to trace returns from functions which where called with a tail call optimization. This update adds support for tracing returns from functions called with a tail call optimization.
- Prior to this update, ltrace could not trace library functions loaded via libdl. This update changes the behavior of the "-x" option for placing static breakpoints so that dynamic libraries are also considered and breakpoints set in them. This works for dynamic libraries that are linked to the binary as well as those that are opened with the function "dlopen" in runtime.
All users of ltrace are advised to upgrade to this updated package, which fixes these bugs and adds this update.