mirror of
git://git.musl-libc.org/musl
synced 2024-12-16 03:35:06 +00:00
d5a5045382
the previous values (2k min and 8k default) were too small for some archs. aarch64 reserves 4k in the signal context for future extensions and requires about 4.5k total, and powerpc reportedly uses over 2k. the new minimums are chosen to fit the saved context and also allow a minimal signal handler to run. since the default (SIGSTKSZ) has always been 6k larger than the minimum, it is also increased to maintain the 6k usable by the signal handler. this happens to be able to store one pathname buffer and should be sufficient for calling any function in libc that doesn't involve conversion between floating point and decimal representations. x86 (both 32-bit and 64-bit variants) may also need a larger minimum (around 2.5k) in the future to support avx-512, but the values on these archs are left alone for now pending further analysis. the value for PTHREAD_STACK_MIN is not increased to match MINSIGSTKSZ at this time. this is so as not to preclude applications from using extremely small thread stacks when they know they will not be handling signals. unfortunately cancellation and multi-threaded set*id() use signals as an implementation detail and therefore require a stack large enough for a signal context, so applications which use extremely small thread stacks may still need to avoid using these features.
259 lines
6.1 KiB
C
259 lines
6.1 KiB
C
#ifndef _SIGNAL_H
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#define _SIGNAL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <features.h>
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#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
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|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
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|| defined(_BSD_SOURCE)
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#ifdef _GNU_SOURCE
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#define __ucontext ucontext
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#endif
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#define __NEED_size_t
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#define __NEED_pid_t
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#define __NEED_uid_t
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#define __NEED_struct_timespec
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#define __NEED_pthread_t
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#define __NEED_pthread_attr_t
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#define __NEED_time_t
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#define __NEED_clock_t
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#define __NEED_sigset_t
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#include <bits/alltypes.h>
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#define SIG_HOLD ((void (*)(int)) 2)
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#define SIG_BLOCK 0
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#define SIG_UNBLOCK 1
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#define SIG_SETMASK 2
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#define SI_ASYNCNL (-60)
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#define SI_TKILL (-6)
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#define SI_SIGIO (-5)
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#define SI_ASYNCIO (-4)
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#define SI_MESGQ (-3)
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#define SI_TIMER (-2)
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#define SI_QUEUE (-1)
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#define SI_USER 0
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#define SI_KERNEL 128
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#define FPE_INTDIV 1
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#define FPE_INTOVF 2
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#define FPE_FLTDIV 3
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#define FPE_FLTOVF 4
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#define FPE_FLTUND 5
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#define FPE_FLTRES 6
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#define FPE_FLTINV 7
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#define FPE_FLTSUB 8
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#define ILL_ILLOPC 1
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#define ILL_ILLOPN 2
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#define ILL_ILLADR 3
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#define ILL_ILLTRP 4
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#define ILL_PRVOPC 5
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#define ILL_PRVREG 6
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#define ILL_COPROC 7
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#define ILL_BADSTK 8
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#define SEGV_MAPERR 1
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#define SEGV_ACCERR 2
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#define SEGV_BNDERR 3
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#define BUS_ADRALN 1
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#define BUS_ADRERR 2
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#define BUS_OBJERR 3
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#define BUS_MCEERR_AR 4
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#define BUS_MCEERR_AO 5
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#define CLD_EXITED 1
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#define CLD_KILLED 2
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#define CLD_DUMPED 3
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#define CLD_TRAPPED 4
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#define CLD_STOPPED 5
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#define CLD_CONTINUED 6
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typedef struct sigaltstack stack_t;
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union sigval {
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int sival_int;
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void *sival_ptr;
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};
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typedef struct {
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int si_signo, si_errno, si_code;
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union {
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char __pad[128 - 2*sizeof(int) - sizeof(long)];
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struct {
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union {
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struct {
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pid_t si_pid;
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uid_t si_uid;
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} __piduid;
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struct {
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int si_timerid;
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int si_overrun;
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} __timer;
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} __first;
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union {
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union sigval si_value;
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struct {
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int si_status;
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clock_t si_utime, si_stime;
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} __sigchld;
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} __second;
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} __si_common;
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struct {
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void *si_addr;
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short si_addr_lsb;
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struct {
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void *si_lower;
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void *si_upper;
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} __addr_bnd;
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} __sigfault;
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struct {
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long si_band;
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int si_fd;
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} __sigpoll;
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struct {
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void *si_call_addr;
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int si_syscall;
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unsigned si_arch;
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} __sigsys;
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} __si_fields;
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} siginfo_t;
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#define si_pid __si_fields.__si_common.__first.__piduid.si_pid
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#define si_uid __si_fields.__si_common.__first.__piduid.si_uid
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#define si_status __si_fields.__si_common.__second.__sigchld.si_status
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#define si_utime __si_fields.__si_common.__second.__sigchld.si_utime
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#define si_stime __si_fields.__si_common.__second.__sigchld.si_stime
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#define si_value __si_fields.__si_common.__second.si_value
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#define si_addr __si_fields.__sigfault.si_addr
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#define si_addr_lsb __si_fields.__sigfault.si_addr_lsb
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#define si_lower __si_fields.__sigfault.__addr_bnd.si_lower
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#define si_upper __si_fields.__sigfault.__addr_bnd.si_upper
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#define si_band __si_fields.__sigpoll.si_band
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#define si_fd __si_fields.__sigpoll.si_fd
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#define si_timerid __si_fields.__si_common.__first.__timer.si_timerid
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#define si_overrun __si_fields.__si_common.__first.__timer.si_overrun
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#define si_ptr si_value.sival_ptr
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#define si_int si_value.sival_int
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#define si_call_addr __si_fields.__sigsys.si_call_addr
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#define si_syscall __si_fields.__sigsys.si_syscall
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#define si_arch __si_fields.__sigsys.si_arch
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struct sigaction {
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union {
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void (*sa_handler)(int);
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void (*sa_sigaction)(int, siginfo_t *, void *);
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} __sa_handler;
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sigset_t sa_mask;
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int sa_flags;
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void (*sa_restorer)(void);
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};
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#define sa_handler __sa_handler.sa_handler
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#define sa_sigaction __sa_handler.sa_sigaction
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struct sigevent {
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union sigval sigev_value;
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int sigev_signo;
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int sigev_notify;
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void (*sigev_notify_function)(union sigval);
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pthread_attr_t *sigev_notify_attributes;
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char __pad[56-3*sizeof(long)];
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};
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#define SIGEV_SIGNAL 0
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#define SIGEV_NONE 1
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#define SIGEV_THREAD 2
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int __libc_current_sigrtmin(void);
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int __libc_current_sigrtmax(void);
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#define SIGRTMIN (__libc_current_sigrtmin())
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#define SIGRTMAX (__libc_current_sigrtmax())
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int kill(pid_t, int);
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int sigemptyset(sigset_t *);
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int sigfillset(sigset_t *);
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int sigaddset(sigset_t *, int);
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int sigdelset(sigset_t *, int);
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int sigismember(const sigset_t *, int);
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int sigprocmask(int, const sigset_t *__restrict, sigset_t *__restrict);
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int sigsuspend(const sigset_t *);
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int sigaction(int, const struct sigaction *__restrict, struct sigaction *__restrict);
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int sigpending(sigset_t *);
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int sigwait(const sigset_t *__restrict, int *__restrict);
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int sigwaitinfo(const sigset_t *__restrict, siginfo_t *__restrict);
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int sigtimedwait(const sigset_t *__restrict, siginfo_t *__restrict, const struct timespec *__restrict);
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int sigqueue(pid_t, int, const union sigval);
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int pthread_sigmask(int, const sigset_t *__restrict, sigset_t *__restrict);
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int pthread_kill(pthread_t, int);
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void psiginfo(const siginfo_t *, const char *);
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void psignal(int, const char *);
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#endif
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#if defined(_XOPEN_SOURCE) || defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
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int killpg(pid_t, int);
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int sigaltstack(const stack_t *__restrict, stack_t *__restrict);
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int sighold(int);
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int sigignore(int);
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int siginterrupt(int, int);
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int sigpause(int);
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int sigrelse(int);
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void (*sigset(int, void (*)(int)))(int);
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#define TRAP_BRKPT 1
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#define TRAP_TRACE 2
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#define POLL_IN 1
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#define POLL_OUT 2
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#define POLL_MSG 3
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#define POLL_ERR 4
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#define POLL_PRI 5
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#define POLL_HUP 6
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#define SS_ONSTACK 1
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#define SS_DISABLE 2
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#endif
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#if defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
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#define NSIG _NSIG
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typedef void (*sig_t)(int);
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#endif
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#ifdef _GNU_SOURCE
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typedef void (*sighandler_t)(int);
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void (*bsd_signal(int, void (*)(int)))(int);
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int sigisemptyset(const sigset_t *);
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int sigorset (sigset_t *, const sigset_t *, const sigset_t *);
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int sigandset(sigset_t *, const sigset_t *, const sigset_t *);
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#define SA_NOMASK SA_NODEFER
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#define SA_ONESHOT SA_RESETHAND
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#endif
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#include <bits/signal.h>
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#define SIG_ERR ((void (*)(int))-1)
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#define SIG_DFL ((void (*)(int)) 0)
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#define SIG_IGN ((void (*)(int)) 1)
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typedef int sig_atomic_t;
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void (*signal(int, void (*)(int)))(int);
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int raise(int);
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#ifdef __cplusplus
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}
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#endif
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#endif
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