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cosmopolitan/libc/intrin/strace.h

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Introduce --strace flag for system call tracing This is similar to the --ftrace (c function call trace) flag, except it's less noisy since it only logs system calls to stderr. Having this flag is valuable because (1) system call tracing tells us a lot about the behavior of complex programs and (2) it's usually very hard to get system call tracing on various operating systems, e.g. strace, ktrace, dtruss, truss, nttrace, etc. Especially on Apple platforms where even with the special boot trick, debuggers still aren't guaranteed to work. make -j8 o//examples o//examples/hello.com --strace This is enabled by default in MODE=, MODE=opt, and MODE=dbg. In MODE=dbg extra information will be printed. make -j8 MODE=dbg o/dbg/examples o/dbg/examples/hello.com --strace |& less This change also changes: - Rename IsText() → _istext() - Rename IsUtf8() → _isutf8() - Fix madvise() on Windows NT - Fix empty string case of inet_ntop() - vfork() wrapper now saves and restores errno - Update xsigaction() to yoink syscall support
2022-03-19 01:07:28 +00:00
#ifndef COSMOPOLITAN_LIBC_CALLS_STRACE_INTERNAL_H_
#define COSMOPOLITAN_LIBC_CALLS_STRACE_INTERNAL_H_
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
#ifndef SYSDEBUG
Exclude strace from MODE=tiny builds This change gets o/tinylinux/examples/hello2.com back down to 8kb in size which had been unintentionally bloated to 40kb in recent months See #965
2023-11-29 11:45:54 +00:00
#define SYSDEBUG 0
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
#endif
Introduce --strace flag for system call tracing This is similar to the --ftrace (c function call trace) flag, except it's less noisy since it only logs system calls to stderr. Having this flag is valuable because (1) system call tracing tells us a lot about the behavior of complex programs and (2) it's usually very hard to get system call tracing on various operating systems, e.g. strace, ktrace, dtruss, truss, nttrace, etc. Especially on Apple platforms where even with the special boot trick, debuggers still aren't guaranteed to work. make -j8 o//examples o//examples/hello.com --strace This is enabled by default in MODE=, MODE=opt, and MODE=dbg. In MODE=dbg extra information will be printed. make -j8 MODE=dbg o/dbg/examples o/dbg/examples/hello.com --strace |& less This change also changes: - Rename IsText() → _istext() - Rename IsUtf8() → _isutf8() - Fix madvise() on Windows NT - Fix empty string case of inet_ntop() - vfork() wrapper now saves and restores errno - Update xsigaction() to yoink syscall support
2022-03-19 01:07:28 +00:00
Make Cosmo mutexes competitive with Apple Libc While we have always licked glibc and musl libc on gnu/systemd sadly the Apple Libc implementation of pthread_mutex_t is better than ours. It may be due to how the XNU kernel and M2 microprocessor are in league when it comes to scheduling processes and the NSYNC behavior is being penalized. We can solve this by leaning more heavily on ulock using Drepper's algo. It's kind of ironic that Linux's official mutexes work terribly on Linux but almost as good as Apple Libc if used on MacOS.
2024-09-03 01:21:03 +00:00
#ifdef MODE_DBG
#define _STRACE_VERBOSE 1
#else
#define _STRACE_VERBOSE 0
#endif
#define _NTTRACE _STRACE_VERBOSE /* not configurable w/ flag yet */
#define _KERNTRACE _STRACE_VERBOSE /* not configurable w/ flag yet */
#define _POLLTRACE _STRACE_VERBOSE /* not configurable w/ flag yet */
#define _LOCKTRACE _STRACE_VERBOSE /* not configurable w/ flag yet */
#define _DATATRACE 1 /* not configurable w/ flag yet */
#define _STDIOTRACE 0 /* not configurable w/ flag yet */
#define _TIMETRACE 0 /* not configurable w/ flag yet */
Fix bugs with recent change This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
2022-04-16 17:40:23 +00:00
Make futexes 100x better on x86 MacOS Thanks to @autumnjolitz (in #876) the Cosmopolitan codebase is now acquainted with Apple's outstanding ulock system calls which offer something much closer to futexes than Grand Central Dispatch which wasn't quite as good, since its wait function can't be interrupted by signals (therefore necessitating a busy loop) and it also needs semaphore objects to be created and freed. Even though ulock is an internal Apple API, strictly speaking, the benefits of futexes are so great that it's worth the risk for now especially since we have the GCD implementation still as a quick escape hatch if it changes Here's why this change is important for x86 XNU users. Cosmo has a suboptimal polyfill when the operating system doesn't offer an API that let's us implement futexes properly. Sadly we had to use that on X86 XNU until now. The polyfill works using clock_nanosleep, to poll the futex in a busy loop with exponential backoff. On XNU x86 clock_nanosleep suffers from us not being able to use a fast clock gettime implementation, which had a compounding effect that's made the polyfill function even more poorly. On X86 XNU we also need to polyfill sched_yield() using select(), which made things even more troublesome. Now that we have futexes we don't have any busy loops anymore for both condition variables and thread joining so optimal performance is attained. To demonstrate, consider these benchmarks Before: $ ./lockscale_test.com -b consumed 38.8377 seconds real time and 0.087131 seconds cpu time After: $ ./lockscale_test.com -b consumed 0.007955 seconds real time and 0.011515 seconds cpu time Fixes #876
2023-10-03 21:47:20 +00:00
#define STRACE_PROLOGUE "%rSYS %6P %6H %'18T "
Introduce --strace flag for system call tracing This is similar to the --ftrace (c function call trace) flag, except it's less noisy since it only logs system calls to stderr. Having this flag is valuable because (1) system call tracing tells us a lot about the behavior of complex programs and (2) it's usually very hard to get system call tracing on various operating systems, e.g. strace, ktrace, dtruss, truss, nttrace, etc. Especially on Apple platforms where even with the special boot trick, debuggers still aren't guaranteed to work. make -j8 o//examples o//examples/hello.com --strace This is enabled by default in MODE=, MODE=opt, and MODE=dbg. In MODE=dbg extra information will be printed. make -j8 MODE=dbg o/dbg/examples o/dbg/examples/hello.com --strace |& less This change also changes: - Rename IsText() → _istext() - Rename IsUtf8() → _isutf8() - Fix madvise() on Windows NT - Fix empty string case of inet_ntop() - vfork() wrapper now saves and restores errno - Update xsigaction() to yoink syscall support
2022-03-19 01:07:28 +00:00
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
#define STRACE(FMT, ...) \
((void)(SYSDEBUG && strace_enabled(0) > 0 && \
(__stracef(STRACE_PROLOGUE FMT "\n", ##__VA_ARGS__), 0)))
Introduce --strace flag for system call tracing This is similar to the --ftrace (c function call trace) flag, except it's less noisy since it only logs system calls to stderr. Having this flag is valuable because (1) system call tracing tells us a lot about the behavior of complex programs and (2) it's usually very hard to get system call tracing on various operating systems, e.g. strace, ktrace, dtruss, truss, nttrace, etc. Especially on Apple platforms where even with the special boot trick, debuggers still aren't guaranteed to work. make -j8 o//examples o//examples/hello.com --strace This is enabled by default in MODE=, MODE=opt, and MODE=dbg. In MODE=dbg extra information will be printed. make -j8 MODE=dbg o/dbg/examples o/dbg/examples/hello.com --strace |& less This change also changes: - Rename IsText() → _istext() - Rename IsUtf8() → _isutf8() - Fix madvise() on Windows NT - Fix empty string case of inet_ntop() - vfork() wrapper now saves and restores errno - Update xsigaction() to yoink syscall support
2022-03-19 01:07:28 +00:00
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
#define DATATRACE(FMT, ...) \
((void)(SYSDEBUG && _DATATRACE && strace_enabled(0) > 0 && \
(__stracef(STRACE_PROLOGUE FMT "\n", ##__VA_ARGS__), 0)))
Fix bugs and add security features to redbean - Fix a regression with the previous change that broke redbean - Add chroot(), resource limit, seccomp, and other stuff to redbean - Write lots and lots of documentation - Iron out more system call issues
2022-04-18 07:01:26 +00:00
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
#define POLLTRACE(FMT, ...) \
((void)(SYSDEBUG && _POLLTRACE && strace_enabled(0) > 0 && \
(__stracef(STRACE_PROLOGUE FMT "\n", ##__VA_ARGS__), 0)))
Fix bugs with recent change This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
2022-04-16 17:40:23 +00:00
Make Cosmo mutexes competitive with Apple Libc While we have always licked glibc and musl libc on gnu/systemd sadly the Apple Libc implementation of pthread_mutex_t is better than ours. It may be due to how the XNU kernel and M2 microprocessor are in league when it comes to scheduling processes and the NSYNC behavior is being penalized. We can solve this by leaning more heavily on ulock using Drepper's algo. It's kind of ironic that Linux's official mutexes work terribly on Linux but almost as good as Apple Libc if used on MacOS.
2024-09-03 01:21:03 +00:00
#define KERNTRACE(FMT, ...) \
((void)(SYSDEBUG && _KERNTRACE && strace_enabled(0) > 0 && \
(__stracef(STRACE_PROLOGUE "\e[2m" FMT "\e[0m\n", ##__VA_ARGS__), \
0)))
Fix bugs with recent change This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
2022-04-16 17:40:23 +00:00
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
#define STDIOTRACE(FMT, ...) \
((void)(SYSDEBUG && _STDIOTRACE && strace_enabled(0) > 0 && \
(__stracef(STRACE_PROLOGUE FMT "\n", ##__VA_ARGS__), 0)))
Fix bugs and make code tinier - Fixed bug where stdio eof wasn't being sticky - Fixed bug where fseeko() wasn't clearing eof state - Removed assert() usage from libc favoring _unassert() / _npassert()
2022-10-10 05:38:28 +00:00
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
#define NTTRACE(FMT, ...) \
((void)(SYSDEBUG && _NTTRACE && strace_enabled(0) > 0 && \
(__stracef(STRACE_PROLOGUE "\e[2m" FMT "\e[0m\n", ##__VA_ARGS__), \
0)))
Fix bugs with recent change This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
2022-04-16 17:40:23 +00:00
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
#define LOCKTRACE(FMT, ...) \
((void)(SYSDEBUG && _LOCKTRACE && strace_enabled(0) > 0 && \
(__stracef(STRACE_PROLOGUE FMT "\n", ##__VA_ARGS__), 0)))
Implement pthread_atfork() If threads are being used, then fork() will now acquire and release and runtime locks so that fork() may be safely used from threads. This also makes vfork() thread safe, because pthread mutexes will do nothing when the process is a child of vfork(). More torture tests have been written to confirm this all works like a charm. Additionally: - Invent hexpcpy() api - Rename nsync_malloc_() to kmalloc() - Complete posix named semaphore implementation - Make pthread_create() asynchronous signal safe - Add rm, rmdir, and touch to command interpreter builtins - Invent sigisprecious() and modify sigset functions to use it - Add unit tests for posix_spawn() attributes and fix its bugs One unresolved problem is the reclaiming of *NSYNC waiter memory in the forked child processes, within apps which have threads waiting on locks
2022-10-16 19:05:08 +00:00
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
#define TIMETRACE(FMT, ...) \
((void)(SYSDEBUG && _TIMETRACE && strace_enabled(0) > 0 && \
(__stracef(STRACE_PROLOGUE FMT "\n", ##__VA_ARGS__), 0)))
Make improvements - This change fixes a bug that allowed unbuffered printf() output (to streams like stderr) to be truncated. This regression was introduced some time between now and the last release. - POSIX specifies all functions as thread safe by default. This change works towards cleaning up our use of the @threadsafe / @threadunsafe documentation annotations to reflect that. The goal is (1) to use @threadunsafe to document functions which POSIX say needn't be thread safe, and (2) use @threadsafe to document functions that we chose to implement as thread safe even though POSIX didn't mandate it. - Tidy up the clock_gettime() implementation. We're now trying out a cleaner approach to system call support that aims to maintain the Linux errno convention as long as possible. This also fixes bugs that existed previously, where the vDSO errno wasn't being translated properly. The gettimeofday() system call is now a wrapper for clock_gettime(), which reduces bloat in apps that use both. - The recently-introduced improvements to the execute bit on Windows has had bugs fixed. access(X_OK) on a directory on Windows now succeeds. fstat() will now perform the MZ/#! ReadFile() operation correctly. - Windows.h is no longer included in libc/isystem/, because it confused PCRE's build system into thinking Cosmopolitan is a WIN32 platform. Cosmo's Windows.h polyfill was never even really that good, since it only defines a subset of the subset of WIN32 APIs that Cosmo defines. - The setlongerjmp() / longerjmp() APIs are removed. While they're nice APIs that are superior to the standardized setjmp / longjmp functions, they weren't superior enough to not be dead code in the monorepo. If you use these APIs, please file an issue and they'll be restored. - The .com appending magic has now been removed from APE Loader.
2023-10-03 02:25:19 +00:00
Improve mkdeps Our makefile generator now accepts badly formatted include lines. It's now more hermetic with better error checking in the cosmo repo, and it can be configured to not be hermetic at all.
2023-11-10 12:14:27 +00:00
int strace_enabled(int);
Introduce --strace flag for system call tracing This is similar to the --ftrace (c function call trace) flag, except it's less noisy since it only logs system calls to stderr. Having this flag is valuable because (1) system call tracing tells us a lot about the behavior of complex programs and (2) it's usually very hard to get system call tracing on various operating systems, e.g. strace, ktrace, dtruss, truss, nttrace, etc. Especially on Apple platforms where even with the special boot trick, debuggers still aren't guaranteed to work. make -j8 o//examples o//examples/hello.com --strace This is enabled by default in MODE=, MODE=opt, and MODE=dbg. In MODE=dbg extra information will be printed. make -j8 MODE=dbg o/dbg/examples o/dbg/examples/hello.com --strace |& less This change also changes: - Rename IsText() → _istext() - Rename IsUtf8() → _isutf8() - Fix madvise() on Windows NT - Fix empty string case of inet_ntop() - vfork() wrapper now saves and restores errno - Update xsigaction() to yoink syscall support
2022-03-19 01:07:28 +00:00
void __stracef(const char *, ...);
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_CALLS_STRACE_INTERNAL_H_ */
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