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Introduce sigtimedwait() and sigwaitinfo()

Browse source 
This change also invents sigcountset() and strsignal_r() and improves
the quality of siginfo_t handling.
This commit is contained in:
Justine Tunney 2022-10-10 07:36:07 -07:00
parent 7ae556463a
commit 467a332e38
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
41 changed files with 887 additions and 345 deletions
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7
libc/calls/calls.mk
View file

@ -65,6 +65,13 @@ $(LIBC_CALLS_A).pkg: \
$(LIBC_CALLS_A_OBJS) \
$(foreach x,$(LIBC_CALLS_A_DIRECTDEPS),$($(x)_A).pkg)
# we can't use asan because:
# siginfo_t memory is owned by kernels
o/$(MODE)/libc/calls/siginfo2cosmo.o: private \
OVERRIDE_COPTS += \
-ffreestanding \
-fno-sanitize=address
# we can't use asan because:
# ucontext_t memory is owned by xnu kernel
o/$(MODE)/libc/calls/sigenter-xnu.o: private \

1
libc/calls/pledge-linux.c
View file

@ -556,6 +556,7 @@ static const uint16_t kPledgeStdio[] = {
__NR_linux_prlimit | STDIO, //
__NR_linux_sched_getaffinity, //
__NR_linux_sched_setaffinity, //
__NR_linux_sigtimedwait, //
};
static const uint16_t kPledgeFlock[] = {

12
libc/calls/sigenter-freebsd.c
View file

@ -22,6 +22,7 @@
#include "libc/calls/struct/sigaction-freebsd.internal.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/siginfo-freebsd.internal.h"
#include "libc/calls/struct/siginfo-meta.internal.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/calls/struct/ucontext-freebsd.internal.h"
#include "libc/calls/ucontext.h"
@ -75,16 +76,7 @@ privileged void __sigenter_freebsd(int sig, struct siginfo_freebsd *freebsdinfo,
g.uc.uc_mcontext.err = ctx->uc_mcontext.mc_err;
g.uc.uc_mcontext.trapno = ctx->uc_mcontext.mc_trapno;
__repmovsb(&g.uc.__fpustate, &ctx->uc_mcontext.mc_fpstate, 512);
g.si.si_signo = freebsdinfo->si_signo;
g.si.si_errno = freebsdinfo->si_errno;
g.si.si_code = freebsdinfo->si_code;
if (freebsdinfo->si_pid) {
g.si.si_pid = freebsdinfo->si_pid;
g.si.si_uid = freebsdinfo->si_uid;
} else {
g.si.si_addr = (void *)freebsdinfo->si_addr;
}
g.si.si_value = freebsdinfo->si_value;
__siginfo2cosmo(&g.si, (void *)freebsdinfo);
((sigaction_f)(_base + rva))(sig, &g.si, &g.uc);
ctx->uc_stack.ss_sp = g.uc.uc_stack.ss_sp;
ctx->uc_stack.ss_size = g.uc.uc_stack.ss_size;

9
libc/calls/sigenter-netbsd.c
View file

@ -21,6 +21,7 @@
#include "libc/calls/state.internal.h"
#include "libc/calls/struct/sigaction-freebsd.internal.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/siginfo-meta.internal.h"
#include "libc/calls/struct/siginfo-netbsd.internal.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/calls/struct/ucontext-netbsd.internal.h"
@ -43,13 +44,7 @@ privileged void __sigenter_netbsd(int sig, struct siginfo_netbsd *si,
((sigaction_f)(_base + rva))(sig, 0, 0);
} else {
__repstosb(&uc, 0, sizeof(uc));
__repstosb(&si2, 0, sizeof(si2));
si2.si_signo = si->si_signo;
si2.si_code = si->si_code;
si2.si_errno = si->si_errno;
si2.si_pid = si->si_pid;
si2.si_uid = si->si_uid;
si2.si_value = si->si_value;
__siginfo2cosmo(&si2, (void *)si);
uc.uc_mcontext.fpregs = &uc.__fpustate;
uc.uc_flags = ctx->uc_flags;
uc.uc_stack.ss_sp = ctx->uc_stack.ss_sp;

14
libc/calls/sigenter-openbsd.c
View file

@ -21,6 +21,7 @@
#include "libc/calls/state.internal.h"
#include "libc/calls/struct/sigaction-freebsd.internal.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/siginfo-meta.internal.h"
#include "libc/calls/struct/siginfo-openbsd.internal.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/calls/struct/ucontext-openbsd.internal.h"
@ -44,17 +45,8 @@ privileged void __sigenter_openbsd(int sig, struct siginfo_openbsd *openbsdinfo,
if (~flags & SA_SIGINFO) {
((sigaction_f)(_base + rva))(sig, 0, 0);
} else {
__repstosb(&g, 0, sizeof(g));
g.si.si_signo = openbsdinfo->si_signo;
g.si.si_code = openbsdinfo->si_code;
g.si.si_errno = openbsdinfo->si_errno;
if (openbsdinfo->si_pid) {
g.si.si_pid = openbsdinfo->si_pid;
g.si.si_uid = openbsdinfo->si_uid;
} else {
g.si.si_addr = (void *)openbsdinfo->si_addr;
}
g.si.si_value = openbsdinfo->si_value;
__repstosb(&g.uc, 0, sizeof(g.uc));
__siginfo2cosmo(&g.si, (void *)openbsdinfo);
g.uc.uc_mcontext.fpregs = &g.uc.__fpustate;
__repmovsb(&g.uc.uc_sigmask, &ctx->sc_mask,
MIN(sizeof(g.uc.uc_sigmask), sizeof(ctx->sc_mask)));

12
libc/calls/sigenter-xnu.c
View file

@ -21,6 +21,7 @@
#include "libc/calls/state.internal.h"
#include "libc/calls/struct/metasigaltstack.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/siginfo-meta.internal.h"
#include "libc/calls/struct/siginfo-xnu.internal.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/calls/ucontext.h"
@ -492,16 +493,7 @@ privileged void __sigenter_xnu(void *fn, int infostyle, int sig,
}
}
if (xnuinfo) {
g.si.si_signo = xnuinfo->si_signo;
g.si.si_errno = xnuinfo->si_errno;
g.si.si_code = xnuinfo->si_code;
if (xnuinfo->si_pid) {
g.si.si_pid = xnuinfo->si_pid;
g.si.si_uid = xnuinfo->si_uid;
} else {
g.si.si_addr = (void *)xnuinfo->si_addr;
}
g.si.si_value = xnuinfo->si_value;
__siginfo2cosmo(&g.si, (void *)xnuinfo);
}
((sigaction_f)(_base + rva))(sig, &g.si, &g.uc);
if (xnuctx) {

106
libc/calls/siginfo2cosmo.c Normal file
View file

@ -0,0 +1,106 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/struct/siginfo-meta.internal.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/dce.h"
#include "libc/sysv/consts/sig.h"
privileged void __siginfo2cosmo(struct siginfo *si,
const union siginfo_meta *m) {
void *si_addr;
int32_t si_signo;
int32_t si_errno;
int32_t si_code;
int32_t si_pid;
int32_t si_uid;
int32_t si_status;
int32_t si_timerid;
int32_t si_overrun;
union sigval si_value;
if (IsLinux()) {
*si = m->linux;
return;
} else if (IsFreebsd()) {
si_signo = m->freebsd.si_signo;
si_errno = m->freebsd.si_errno;
si_code = m->freebsd.si_code;
si_pid = m->freebsd.si_pid;
si_uid = m->freebsd.si_uid;
si_status = m->freebsd.si_status;
si_timerid = m->freebsd.si_timerid;
si_overrun = m->freebsd.si_overrun;
si_addr = m->freebsd.si_addr;
si_value = m->freebsd.si_value;
} else if (IsXnu()) {
si_signo = m->xnu.si_signo;
si_errno = m->xnu.si_errno;
si_code = m->xnu.si_code;
si_pid = m->xnu.si_pid;
si_uid = m->xnu.si_uid;
si_status = m->xnu.si_status;
si_timerid = 0;
si_overrun = 0;
si_addr = m->xnu.si_addr;
si_value = m->xnu.si_value;
} else if (IsOpenbsd()) {
si_signo = m->openbsd.si_signo;
si_errno = m->openbsd.si_errno;
si_code = m->openbsd.si_code;
si_pid = m->openbsd.si_pid;
si_uid = m->openbsd.si_uid;
si_status = m->openbsd.si_status;
si_timerid = 0;
si_overrun = 0;
si_addr = m->openbsd.si_addr;
si_value = m->openbsd.si_value;
} else if (IsNetbsd()) {
si_signo = m->netbsd.si_signo;
si_errno = m->netbsd.si_errno;
si_code = m->netbsd.si_code;
si_pid = m->netbsd.si_pid;
si_uid = m->netbsd.si_uid;
si_status = m->netbsd.si_status;
si_timerid = 0;
si_overrun = 0;
si_addr = m->netbsd.si_addr;
si_value = m->netbsd.si_value;
} else {
notpossible;
}
*si = (struct siginfo){0};
si->si_signo = si_signo;
si->si_errno = si_errno;
si->si_code = si_code;
si->si_value = si_value;
if (si_signo == SIGILL || //
si_signo == SIGFPE || //
si_signo == SIGSEGV || //
si_signo == SIGBUS || //
si_signo == SIGTRAP) {
si->si_addr = si_addr;
} else if (si_signo == SIGALRM) {
si->si_timerid = si_timerid;
si->si_overrun = si_overrun;
} else {
si->si_pid = si_pid;
si->si_uid = si_uid;
}
}

25
libc/calls/sigpending.c
View file

@ -17,37 +17,44 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/sig.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/calls/struct/sigset.h"
#include "libc/calls/struct/sigset.internal.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/sysv/errfuns.h"
/**
* Determines the blocked pending signals
*
* @param pending is where the bitset of pending signals is returned,
* may not be NULL.
* @return -1 w/ EFAULT
* which may not be null
* @return 0 on success, or -1 w/ errno
* @raise EFAULT if `pending` points to invalid memory
* @asyncsignalsafe
*/
int sigpending(sigset_t *pending) {
int rc;
if (IsAsan() && !__asan_is_valid(pending, sizeof(*pending))) {
if (!pending || (IsAsan() && !__asan_is_valid(pending, sizeof(*pending)))) {
rc = efault();
} else if (IsLinux() || IsNetbsd() || IsOpenbsd() || IsFreebsd() || IsXnu()) {
// 128 signals on NetBSD and FreeBSD, 64 on Linux, 32 on OpenBSD and XNU
rc = sys_sigpending(pending, 8);
// 128 signals on NetBSD and FreeBSD, 64 on Linux, 32 on OpenBSD and XNU.
// OpenBSD passes signal sets in words rather than pointers
if (IsOpenbsd()) {
pending->__bits[0] = (unsigned)rc;
rc = 0;
} else if (IsXnu()) {
pending->__bits[0] &= 0xFFFFFFFF;
}
if (IsLinux() || IsOpenbsd() || IsXnu()) {
pending->__bits[1] = 0;
// only modify memory on success
if (!rc) {
// clear unsupported bits
if (IsXnu()) {
pending->__bits[0] &= 0xFFFFFFFF;
}
if (IsLinux() || IsOpenbsd() || IsXnu()) {
pending->__bits[1] = 0;
}
}
} else if (IsWindows()) {
sigemptyset(pending);

75
libc/calls/sigtimedwait.c Normal file
View file

@ -0,0 +1,75 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/asan.internal.h"
#include "libc/calls/sigtimedwait.h"
#include "libc/calls/sigtimedwait.internal.h"
#include "libc/calls/struct/siginfo.internal.h"
#include "libc/calls/struct/sigset.internal.h"
#include "libc/calls/struct/timespec.internal.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
/**
* Waits for signal synchronously, w/ timeout.
*
* @param set is signals for which we'll be waiting
* @param info if not null shall receive info about signal
* @param timeout is relative deadline and null means wait forever
* @return signal number on success, or -1 w/ errno
* @raise EINTR if an asynchronous signal was delivered instead
* @raise EINVAL if nanoseconds parameter was out of range
* @raise EAGAIN if deadline expired
* @raise ENOSYS on Windows, XNU, OpenBSD, Metal
* @raise EFAULT if invalid memory was supplied
*/
int sigtimedwait(const sigset_t *set, siginfo_t *info,
const struct timespec *timeout) {
int rc;
char strsig[15];
struct timespec ts;
union siginfo_meta si = {0};
if (IsAsan() && (!__asan_is_valid(set, sizeof(*set)) ||
(info && !__asan_is_valid(info, sizeof(*info))) ||
(timeout && !__asan_is_valid_timespec(timeout)))) {
rc = efault();
} else if (IsLinux() || IsFreebsd() || IsNetbsd()) {
if (timeout) {
// 1. Linux needs its size parameter
// 2. NetBSD modifies timeout argument
ts = *timeout;
rc = sys_sigtimedwait(set, &si, &ts, 8);
} else {
rc = sys_sigtimedwait(set, &si, 0, 8);
}
if (rc != -1 && info) {
__siginfo2cosmo(info, &si);
}
} else {
rc = enosys();
}
STRACE("sigtimedwait(%s, [%s], %s) → %s% m", DescribeSigset(0, set),
DescribeSiginfo(rc, info), DescribeTimespec(0, timeout),
strsignal_r(rc, strsig));
return rc;
}

14
libc/calls/sigtimedwait.h Normal file
View file

@ -0,0 +1,14 @@
#ifndef COSMOPOLITAN_LIBC_CALLS_SIGTIMEDWAIT_H_
#define COSMOPOLITAN_LIBC_CALLS_SIGTIMEDWAIT_H_
#include "libc/calls/struct/siginfo.h"
#include "libc/calls/struct/sigset.h"
#include "libc/calls/struct/timespec.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
int sigtimedwait(const sigset_t *, siginfo_t *, const struct timespec *);
int sigwaitinfo(const sigset_t *, siginfo_t *);
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_CALLS_SIGTIMEDWAIT_H_ */

14
libc/calls/sigtimedwait.internal.h Normal file
View file

@ -0,0 +1,14 @@
#ifndef COSMOPOLITAN_LIBC_CALLS_SIGTIMEDWAIT_INTERNAL_H_
#define COSMOPOLITAN_LIBC_CALLS_SIGTIMEDWAIT_INTERNAL_H_
#include "libc/calls/struct/siginfo-meta.internal.h"
#include "libc/calls/struct/sigset.h"
#include "libc/calls/struct/timespec.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
int sys_sigtimedwait(const sigset_t *, union siginfo_meta *,
const struct timespec *, size_t) hidden;
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_CALLS_SIGTIMEDWAIT_INTERNAL_H_ */

33
libc/calls/sigwaitinfo.c Normal file
View file

@ -0,0 +1,33 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/sigtimedwait.h"
/**
* Waits for signal synchronously.
*
* @param set is signals for which we'll be waiting
* @param info if not null shall receive info about signal
* @return signal number on success, or -1 w/ errno
* @raise EINTR if an asynchronous signal was delivered instead
* @raise ENOSYS on OpenBSD, XNU, and Windows
* @see sigtimedwait()
*/
int sigwaitinfo(const sigset_t *mask, siginfo_t *si) {
return sigtimedwait(mask, si, 0);
}

23
libc/calls/struct/siginfo-meta.internal.h Normal file
View file

@ -0,0 +1,23 @@
#ifndef COSMOPOLITAN_LIBC_CALLS_STRUCT_SIGINFO_META_INTERNAL_H_
#define COSMOPOLITAN_LIBC_CALLS_STRUCT_SIGINFO_META_INTERNAL_H_
#include "libc/calls/struct/siginfo-freebsd.internal.h"
#include "libc/calls/struct/siginfo-netbsd.internal.h"
#include "libc/calls/struct/siginfo-openbsd.internal.h"
#include "libc/calls/struct/siginfo-xnu.internal.h"
#include "libc/calls/struct/siginfo.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
union siginfo_meta {
struct siginfo linux;
struct siginfo_xnu xnu;
struct siginfo_freebsd freebsd;
struct siginfo_openbsd openbsd;
struct siginfo_netbsd netbsd;
};
void __siginfo2cosmo(struct siginfo *, const union siginfo_meta *) hidden;
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_SIGINFO_META_INTERNAL_H_ */

4
libc/calls/struct/siginfo.h
View file

@ -12,11 +12,13 @@ struct siginfo {
struct {
union {
struct {
/* signals sent by kill() and sigqueue() set these */
int32_t si_pid;
uint32_t si_uid;
};
struct {
int32_t si_timerid; /* SIGALRM */
/* SIGALRM sets these */
int32_t si_timerid;
int32_t si_overrun;
};
};

4
libc/calls/struct/siginfo.internal.h
View file

@ -3,6 +3,7 @@
#include "libc/calls/struct/sigaction-xnu.internal.h"
#include "libc/calls/struct/siginfo-xnu.internal.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/mem/alloca.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
@ -10,6 +11,9 @@ int sys_sigqueueinfo(int, const siginfo_t *) hidden;
void __sigenter_xnu(void *, int, int, struct siginfo_xnu *,
struct __darwin_ucontext *) hidden;
const char *DescribeSiginfo(char[300], int, const siginfo_t *);
#define DescribeSiginfo(x, y) DescribeSiginfo(alloca(300), x, y)
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_CALLS_STRUCT_SIGINFO_INTERNAL_H_ */

5
libc/calls/struct/sigset.h
View file

@ -13,11 +13,12 @@ int sigemptyset(sigset_t *) paramsnonnull();
int sigfillset(sigset_t *) paramsnonnull();
int sigandset(sigset_t *, const sigset_t *, const sigset_t *) paramsnonnull();
int sigorset(sigset_t *, const sigset_t *, const sigset_t *) paramsnonnull();
int sigisemptyset(const sigset_t *) paramsnonnull();
int sigisemptyset(const sigset_t *) paramsnonnull() nosideeffect;
int sigismember(const sigset_t *, int) paramsnonnull() nosideeffect;
int sigcountset(const sigset_t *) paramsnonnull() nosideeffect;
int sigprocmask(int, const sigset_t *, sigset_t *);
int sigsuspend(const sigset_t *);
int sigpending(sigset_t *) paramsnonnull() nosideeffect;
int sigpending(sigset_t *);
int pthread_sigmask(int, const sigset_t *, sigset_t *);
COSMOPOLITAN_C_END_