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/* ISC license. */
/* MT-unsafe */
#include <skalibs/sysdeps.h>
#ifdef SKALIBS_HASSIGNALFD
#include <errno.h>
#include <signal.h>
#include <sys/signalfd.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/sig.h>
#include <skalibs/djbunix.h>
struct selfpipe_s
{
sigset_t caught ;
int fd ;
} ;
static struct selfpipe_s sp = { .fd = -1 } ;
int selfpipe_fd ()
{
return sp.fd ;
}
int selfpipe_read ()
{
struct signalfd_siginfo buf ;
ssize_t r = sanitize_read(fd_read(sp.fd, (char *)&buf, sizeof(struct signalfd_siginfo))) ;
return (r <= 0) ? r : buf.ssi_signo ;
}
int selfpipe_trap (int sig)
{
sigset_t set = sp.caught ;
sigset_t old ;
if (sp.fd == -1) return (errno = EBADF, 0) ;
if (sigaddset(&set, sig) == -1 || sigprocmask(SIG_BLOCK, &set, &old) == -1) return 0 ;
if (signalfd(sp.fd, &set, SFD_NONBLOCK | SFD_CLOEXEC) == -1)
{
int e = errno ;
sigprocmask(SIG_SETMASK, &old, 0) ;
errno = e ;
return 0 ;
}
sp.caught = set ;
return 1 ;
}
int selfpipe_trapset (sigset_t const *set)
{
sigset_t old ;
if (sp.fd == -1) return (errno = EBADF, 0) ;
if (sigprocmask(SIG_SETMASK, set, &old) == -1) return 0 ;
if (signalfd(sp.fd, set, SFD_NONBLOCK | SFD_CLOEXEC) == -1)
{
int e = errno ;
sigprocmask(SIG_SETMASK, &old, 0) ;
errno = e ;
return 0 ;
}
sp.caught = *set ;
return 1 ;
}
void selfpipe_finish ()
{
int e = errno ;
fd_close(sp.fd) ; sp.fd = -1 ;
sigprocmask(SIG_UNBLOCK, &sp.caught, 0) ;
sigemptyset(&sp.caught) ;
errno = e ;
}
int selfpipe_init ()
{
sigemptyset(&sp.caught) ;
sig_blocknone() ;
sp.fd = signalfd(sp.fd, &sp.caught, SFD_NONBLOCK | SFD_CLOEXEC) ;
return sp.fd ;
}
#else
#include <skalibs/nonposix.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <skalibs/nsig.h>
#include <skalibs/sig.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/djbunix.h>
struct selfpipe_s
{
sigset_t caught ;
int fd[2] ;
} ;
static struct selfpipe_s sp = { .fd = { -1, -1 } } ;
static void selfpipe_tophalf (int s)
{
int e = errno ;
unsigned char c = (unsigned char)s ;
write(sp.fd[1], (char *)&c, 1) ;
errno = e ;
}
int selfpipe_fd ()
{
return sp.fd[0] ;
}
int selfpipe_read ()
{
char c ;
ssize_t r = sanitize_read((fd_read(sp.fd[0], &c, 1))) ;
return (r <= 0) ? r : c ;
}
int selfpipe_trap (int sig)
{
if (sp.fd[0] == -1) return (errno = EBADF, 0) ;
if (!sig_catch(sig, &selfpipe_tophalf)) return 0 ;
sigaddset(&sp.caught, sig) ;
sig_unblock(sig) ;
return 1 ;
}
int selfpipe_trapset (sigset_t const *set)
{
unsigned int i = 1 ;
if (sp.fd[0] == -1) return (errno = EBADF, 0) ;
for (; i < SKALIBS_NSIG ; i++)
{
int h = sigismember(set, i) ;
if (h < 0) continue ;
if (h)
{
if (!sig_catch(i, &selfpipe_tophalf)) goto err ;
}
else if (sigismember(&sp.caught, i))
{
if (!sig_restore(i)) goto err ;
}
}
sig_blocknone() ;
sp.caught = *set ;
return 1 ;
err:
sig_restoreto(set, i) ;
return 0 ;
}
void selfpipe_finish ()
{
int e = errno ;
sigprocmask(SIG_BLOCK, &sp.caught, 0) ;
sig_restoreto(&sp.caught, SKALIBS_NSIG) ;
fd_close(sp.fd[1]) ;
fd_close(sp.fd[0]) ;
sigprocmask(SIG_UNBLOCK, &sp.caught, 0) ;
sigemptyset(&sp.caught) ;
sp.fd[0] = sp.fd[1] = -1 ;
errno = e ;
}
int selfpipe_init ()
{
if (sp.fd[0] >= 0) selfpipe_finish() ;
else sigemptyset(&sp.caught) ;
sig_blocknone() ;
return pipenbcoe(sp.fd) < 0 ? -1 : sp.fd[0] ;
}
#endif
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