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/*
* signames.c - ps signal names
*
* Copyright © 2023 Craig Small <csmall@dropbear.xyz>
* Copyright © 2020 Luis Chamberlain <mcgrof@kernel.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <stdbool.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <ctype.h>
#include <pwd.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include "common.h"
#include "signals.h"
/* For libraries like musl */
#ifndef __SIGRTMIN
#define __SIGRTMIN SIGRTMIN
#endif
#ifndef __SIGRTMAX
#define __SIGRTMAX SIGRTMAX
#endif
/*
* The actual list of unsupported signals varies by operating system. This
* program is Linux specific as it processes /proc/ for signal information and
* there is no generic way to extract each process signal information for each
* OS. This program also relies on Linux glibc defines to figure out which
* signals are reserved for use by libc and then which ones are real time
* specific.
*/
/*
* As per glibc:
*
* A system that defines real time signals overrides __SIGRTMAX to be something
* other than __SIGRTMIN. This also means we can count on __SIGRTMIN being the
* first real time signal, meaning what Linux programs it for your architecture
* in the kernel. SIGRTMIN then will be the application specific first real
* time signal, that is, on top of libc. The values in between
*
* __SIGRTMIN .. SIGRTMIN
*
* are used by * libc, typically for helping threading implementation.
*/
static const char *sigstat_strsignal_abbrev(int sig, char *abbrev, size_t len)
{
memset(abbrev, '\0', len);
if (sig == 0 || sig >= NSIG) {
snprintf(abbrev, len, "BOGUS_%02d", sig - _NSIG);
return abbrev;
}
/*
* The standard lower signals we can count on this being the kernel
* specific SIGRTMIN.
*/
if (sig < __SIGRTMIN) {
const char *signame = NULL;
#ifdef HAVE_SIGABBREV_NP
signame = sigabbrev_np(sig);
#else
signame = signal_number_to_name(sig);
#endif /* HAVE_SIGABBREV_NP */
if (signame != NULL && signame[0] != '\0') {
strncpy(abbrev, signame, len);
return abbrev;
}
}
/* This means your system should *not* have realtime signals */
if (__SIGRTMAX == __SIGRTMIN) {
snprintf(abbrev, len, "INVALID_%02d", sig);
return abbrev;
}
/*
* If we're dealing with a libc real time signal start counting
* after libc's version of SIGRTMIN
*/
if (sig >= SIGRTMIN) {
if (sig == SIGRTMIN)
snprintf(abbrev, len, "RTMIN");
else if (sig == SIGRTMAX)
snprintf(abbrev, len, "RTMAX");
else
snprintf(abbrev, len, "RTMIN+%02d", sig - SIGRTMIN);
} else
snprintf(abbrev, len, "LIBC+%02d", sig - __SIGRTMIN);
return abbrev;
}
/*
* For instance SIGTERM is 15, but its actual mask value is
* 1 << (15-1) = 0x4000
*/
static uint64_t mask_sig_val_num(int signum)
{
return ((uint64_t) 1 << (signum -1));
}
int print_signame(char *restrict const outbuf, const char *restrict const sig, const size_t len_in)
{
unsigned int i;
char abbrev[PATH_MAX];
unsigned int n = 0;
char *c = outbuf;
size_t len = len_in;
uint64_t mask, mask_in;
uint64_t test_val = 0;
if (1 != sscanf(sig, "%" PRIu64, &mask_in))
return 0;
mask = mask_in;
for (i=1; i < NSIG; i++) {
test_val = mask_sig_val_num(i);
if (test_val & mask) {
n = strlen(sigstat_strsignal_abbrev(i, abbrev, PATH_MAX));
if (n+1 >= len) { // +1 for the '+'
strcpy(c, "+");
len -= 1;
c += 1;
break;
} else {
n = snprintf(c, len, (c==outbuf)?"%s":",%s",
sigstat_strsignal_abbrev(i, abbrev,
PATH_MAX));
len -= n;
c+=n;
}
}
}
if (c == outbuf) {
n = snprintf(c, len, "%c", '-');
len -= n;
c += n;
}
return (int) (c-outbuf);
}
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