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cosmopolitan/libc/calls/calls.h
Justine Tunney ec480f5aa0
Make improvements 
- Every unit test now passes on Apple Silicon. The final piece of this
  puzzle was porting our POSIX threads cancelation support, since that
  works differently on ARM64 XNU vs. AMD64. Our semaphore support on
  Apple Silicon is also superior now compared to AMD64, thanks to the
  grand central dispatch library which lets *NSYNC locks go faster.

- The Cosmopolitan runtime is now more stable, particularly on Windows.
  To do this, thread local storage is mandatory at all runtime levels,
  and the innermost packages of the C library is no longer being built
  using ASAN. TLS is being bootstrapped with a 128-byte TIB during the
  process startup phase, and then later on the runtime re-allocates it
  either statically or dynamically to support code using _Thread_local.
  fork() and execve() now do a better job cooperating with threads. We
  can now check how much stack memory is left in the process or thread
  when functions like kprintf() / execve() etc. call alloca(), so that
  ENOMEM can be raised, reduce a buffer size, or just print a warning.

- POSIX signal emulation is now implemented the same way kernels do it
  with pthread_kill() and raise(). Any thread can interrupt any other
  thread, regardless of what it's doing. If it's blocked on read/write
  then the killer thread will cancel its i/o operation so that EINTR can
  be returned in the mark thread immediately. If it's doing a tight CPU
  bound operation, then that's also interrupted by the signal delivery.
  Signal delivery works now by suspending a thread and pushing context
  data structures onto its stack, and redirecting its execution to a
  trampoline function, which calls SetThreadContext(GetCurrentThread())
  when it's done.

- We're now doing a better job managing locks and handles. On NetBSD we
  now close semaphore file descriptors in forked children. Semaphores on
  Windows can now be canceled immediately, which means mutexes/condition
  variables will now go faster. Apple Silicon semaphores can be canceled
  too. We're now using Apple's pthread_yield() funciton. Apple _nocancel
  syscalls are now used on XNU when appropriate to ensure pthread_cancel
  requests aren't lost. The MbedTLS library has been updated to support
  POSIX thread cancelations. See tool/build/runitd.c for an example of
  how it can be used for production multi-threaded tls servers. Handles
  on Windows now leak less often across processes. All i/o operations on
  Windows are now overlapped, which means file pointers can no longer be
  inherited across dup() and fork() for the time being.

- We now spawn a thread on Windows to deliver SIGCHLD and wakeup wait4()
  which means, for example, that posix_spawn() now goes 3x faster. POSIX
  spawn is also now more correct. Like Musl, it's now able to report the
  failure code of execve() via a pipe although our approach favors using
  shared memory to do that on systems that have a true vfork() function.

- We now spawn a thread to deliver SIGALRM to threads when setitimer()
  is used. This enables the most precise wakeups the OS makes possible.

- The Cosmopolitan runtime now uses less memory. On NetBSD for example,
  it turned out the kernel would actually commit the PT_GNU_STACK size
  which caused RSS to be 6mb for every process. Now it's down to ~4kb.
  On Apple Silicon, we reduce the mandatory upstream thread size to the
  smallest possible size to reduce the memory overhead of Cosmo threads.
  The examples directory has a program called greenbean which can spawn
  a web server on Linux with 10,000 worker threads and have the memory
  usage of the process be ~77mb. The 1024 byte overhead of POSIX-style
  thread-local storage is now optional; it won't be allocated until the
  pthread_setspecific/getspecific functions are called. On Windows, the
  threads that get spawned which are internal to the libc implementation
  use reserve rather than commit memory, which shaves a few hundred kb.

- sigaltstack() is now supported on Windows, however it's currently not
  able to be used to handle stack overflows, since crash signals are
  still generated by WIN32. However the crash handler will still switch
  to the alt stack, which is helpful in environments with tiny threads.

- Test binaries are now smaller. Many of the mandatory dependencies of
  the test runner have been removed. This ensures many programs can do a
  better job only linking the the thing they're testing. This caused the
  test binaries for LIBC_FMT for example, to decrease from 200kb to 50kb

- long double is no longer used in the implementation details of libc,
  except in the APIs that define it. The old code that used long double
  for time (instead of struct timespec) has now been thoroughly removed.

- ShowCrashReports() is now much tinier in MODE=tiny. Instead of doing
  backtraces itself, it'll just print a command you can run on the shell
  using our new `cosmoaddr2line` program to view the backtrace.

- Crash report signal handling now works in a much better way. Instead
  of terminating the process, it now relies on SA_RESETHAND so that the
  default SIG_IGN behavior can terminate the process if necessary.

- Our pledge() functionality has now been fully ported to AARCH64 Linux.
2023-09-18 21:04:47 -07:00

261 lines
9.3 KiB
C
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#ifndef COSMOPOLITAN_LIBC_CALLS_SYSCALLS_H_
#define COSMOPOLITAN_LIBC_CALLS_SYSCALLS_H_
#define _POSIX_VERSION 200809L
#define _POSIX2_VERSION _POSIX_VERSION
#define _XOPEN_VERSION 700
#define _POSIX_MAPPED_FILES _POSIX_VERSION
#define _POSIX_FSYNC _POSIX_VERSION
#define _POSIX_IPV6 _POSIX_VERSION
#define _POSIX_THREADS _POSIX_VERSION
#define _POSIX_THREAD_PROCESS_SHARED _POSIX_VERSION
#define _POSIX_THREAD_SAFE_FUNCTIONS _POSIX_VERSION
#define _POSIX_THREAD_ATTR_STACKADDR _POSIX_VERSION
#define _POSIX_THREAD_ATTR_STACKSIZE _POSIX_VERSION
#define _POSIX_THREAD_PRIORITY_SCHEDULING _POSIX_VERSION
#define _POSIX_THREAD_CPUTIME _POSIX_VERSION
#define _POSIX_TIMEOUTS _POSIX_VERSION
#define _POSIX_MONOTONIC_CLOCK _POSIX_VERSION
#define _POSIX_CPUTIME _POSIX_VERSION
#define _POSIX_BARRIERS _POSIX_VERSION
#define _POSIX_SPIN_LOCKS _POSIX_VERSION
#define _POSIX_READER_WRITER_LOCKS _POSIX_VERSION
#define _POSIX_SEMAPHORES _POSIX_VERSION
#define _POSIX_SHARED_MEMORY_OBJECTS _POSIX_VERSION
#define _POSIX_MEMLOCK_RANGE _POSIX_VERSION
#define _POSIX_SPAWN _POSIX_VERSION
#define SEEK_SET 0 /* relative to beginning */
#define SEEK_CUR 1 /* relative to current position */
#define SEEK_END 2 /* relative to end */
#define __WALL 0x40000000 /* Wait on all children, regardless of type */
#define __WCLONE 0x80000000 /* Wait only on non-SIGCHLD children */
#define SIG_ERR ((void (*)(int))(-1))
#define SIG_DFL ((void (*)(int))0)
#define SIG_IGN ((void (*)(int))1)
#define CLOCKS_PER_SEC 1000000L
#define MAP_FAILED ((void *)-1)
#define WTERMSIG(x) (127 & (x))
#define WCOREDUMP(x) (128 & (x))
#define WIFEXITED(x) (!WTERMSIG(x))
#define WEXITSTATUS(x) ((x) >> 8)
#define WSTOPSIG(x) ((0xff00 & (x)) >> 8)
#define WIFSTOPPED(x) __wifstopped(x)
#define WIFSIGNALED(x) __wifsignaled(x)
#define WIFCONTINUED(x) __wifcontinued(x)
#define W_STOPCODE(x) ((x) << 8 | 0177)
#ifdef _COSMO_SOURCE
#define clone __clone
#define commandv __commandv
#define fileexists __fileexists
#define ischardev __ischardev
#define isdirectory __isdirectory
#define isexecutable __isexecutable
#define isregularfile __isregularfile
#define issymlink __issymlink
#define makedirs __makedirs
#define tmpfd __tmpfd
#endif
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
/*───────────────────────────────────────────────────────────────────────────│─╗
│ cosmopolitan § system calls ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
typedef int sig_atomic_t;
bool32 isatty(int);
char *getcwd(char *, size_t);
char *realpath(const char *, char *) __wur;
char *ttyname(int);
int access(const char *, int) dontthrow;
int chdir(const char *);
int chmod(const char *, unsigned);
int chown(const char *, unsigned, unsigned);
int chroot(const char *);
int close(int);
int close_range(unsigned, unsigned, unsigned);
int closefrom(int);
int creat(const char *, unsigned);
int dup(int);
int dup2(int, int);
int dup3(int, int, int);
int execl(const char *, const char *, ...) nullterminated();
int execle(const char *, const char *, ...) nullterminated((1));
int execlp(const char *, const char *, ...) nullterminated();
int execv(const char *, char *const[]);
int execve(const char *, char *const[], char *const[]);
int execvp(const char *, char *const[]);
int faccessat(int, const char *, int, int);
int fchdir(int);
int fchmod(int, unsigned) dontthrow;
int fchmodat(int, const char *, unsigned, int);
int fchown(int, unsigned, unsigned);
int fchownat(int, const char *, unsigned, unsigned, int);
int fcntl(int, int, ...);
int fdatasync(int);
int fexecve(int, char *const[], char *const[]);
int flock(int, int);
int fork(void);
int fsync(int);
int ftruncate(int, int64_t);
int getdomainname(char *, size_t);
int getgroups(int, unsigned[]);
int gethostname(char *, size_t);
int getloadavg(double *, int);
int getpgid(int) libcesque;
int getpgrp(void) nosideeffect;
int getpid(void) nosideeffect libcesque;
int getppid(void);
int getpriority(int, unsigned);
int getsid(int) nosideeffect libcesque;
int ioctl(int, unsigned long, ...);
int issetugid(void);
int kill(int, int);
int killpg(int, int);
int lchmod(const char *, unsigned);
int lchown(const char *, unsigned, unsigned);
int link(const char *, const char *) dontthrow;
int linkat(int, const char *, int, const char *, int);
int mincore(void *, size_t, unsigned char *);
int mkdir(const char *, unsigned);
int mkdirat(int, const char *, unsigned);
int mkfifo(const char *, unsigned);
int mkfifoat(int, const char *, unsigned);
int mknod(const char *, unsigned, uint64_t);
int nice(int);
int open(const char *, int, ...);
int openat(int, const char *, int, ...);
int pause(void);
int pipe(int[hasatleast 2]);
int pipe2(int[hasatleast 2], int);
int posix_fadvise(int, int64_t, int64_t, int);
int posix_madvise(void *, uint64_t, int);
int raise(int);
int reboot(int);
int remove(const char *);
int rename(const char *, const char *);
int renameat(int, const char *, int, const char *);
int rmdir(const char *);
int sched_yield(void);
int setegid(unsigned);
int seteuid(unsigned);
int setfsgid(unsigned);
int setfsuid(unsigned);
int setgid(unsigned);
int setgroups(size_t, const unsigned[]);
int setpgid(int, int);
int setpgrp(void);
int setpriority(int, unsigned, int);
int setregid(unsigned, unsigned);
int setreuid(unsigned, unsigned);
int setsid(void);
int setuid(unsigned);
int sigignore(int);
int siginterrupt(int, int);
int symlink(const char *, const char *);
int symlinkat(const char *, int, const char *);
int truncate(const char *, int64_t);
int ttyname_r(int, char *, size_t);
int unlink(const char *);
int unlinkat(int, const char *, int);
int usleep(unsigned);
int vfork(void) returnstwice;
int wait(int *);
int waitpid(int, int *, int);
int64_t clock(void);
int64_t time(int64_t *);
ssize_t copy_file_range(int, long *, int, long *, size_t, unsigned);
ssize_t lseek(int, int64_t, int);
ssize_t pread(int, void *, size_t, int64_t);
ssize_t pwrite(int, const void *, size_t, int64_t);
ssize_t read(int, void *, size_t);
ssize_t readlink(const char *, char *, size_t);
ssize_t readlinkat(int, const char *, char *, size_t);
ssize_t write(int, const void *, size_t);
unsigned alarm(unsigned);
unsigned getegid(void) nosideeffect;
unsigned geteuid(void) nosideeffect;
unsigned getgid(void) nosideeffect;
unsigned getuid(void) libcesque;
unsigned sleep(unsigned);
unsigned ualarm(unsigned, unsigned);
unsigned umask(unsigned);
void sync(void);
#if defined(_COSMO_SOURCE) || defined(_GNU_SOURCE)
int syncfs(int);
int prctl(int, ...);
int gettid(void) libcesque;
int setresgid(unsigned, unsigned, unsigned);
int setresuid(unsigned, unsigned, unsigned);
int getresgid(unsigned *, unsigned *, unsigned *);
int getresuid(unsigned *, unsigned *, unsigned *);
char *get_current_dir_name(void) __wur;
int sync_file_range(int, int64_t, int64_t, unsigned);
ssize_t splice(int, int64_t *, int, int64_t *, size_t, unsigned);
int memfd_create(const char *, unsigned int);
int execvpe(const char *, char *const[], char *const[]);
int euidaccess(const char *, int);
int eaccess(const char *, int);
int madvise(void *, uint64_t, int);
#endif
#ifdef _COSMO_SOURCE
bool32 fdexists(int);
bool32 fileexists(const char *);
bool32 isdirectory(const char *);
bool32 isexecutable(const char *);
bool32 isregularfile(const char *);
bool32 issymlink(const char *);
bool32 ischardev(int);
char *commandv(const char *, char *, size_t);
int clone(void *, void *, size_t, int, void *, void *, void *, void *);
int makedirs(const char *, unsigned);
int pivot_root(const char *, const char *);
int pledge(const char *, const char *);
int seccomp(unsigned, unsigned, void *);
int sys_iopl(int);
int sys_mlock(const void *, size_t);
int sys_mlock2(const void *, size_t, int);
int sys_mlockall(int);
int sys_personality(uint64_t);
int sys_munlock(const void *, size_t);
int sys_munlockall(void);
int sys_ptrace(int, ...);
int sys_sysctl(const int *, unsigned, void *, size_t *, void *, size_t);
int sys_ioprio_get(int, int);
int sys_ioprio_set(int, int, int);
int tmpfd(void);
int touch(const char *, unsigned);
int unveil(const char *, const char *);
long ptrace(int, ...);
int fadvise(int, uint64_t, uint64_t, int);
ssize_t copyfd(int, int, size_t);
ssize_t readansi(int, char *, size_t);
ssize_t tinyprint(int, const char *, ...) nullterminated();
#endif /* _COSMO_SOURCE */
int __wifstopped(int) pureconst;
int __wifcontinued(int) pureconst;
int __wifsignaled(int) pureconst;
#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
#define lseek64 lseek
#define pread64 pread
#define pwrite64 pwrite
#define truncate64 truncate
#define ftruncate64 ftruncate
#define lockf64 lockf
#endif
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_CALLS_SYSCALLS_H_ */
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