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#include <__signal.h> // for __sys_signame
#include <asm-generic/signal.h> // for SIGRTMAX, SIGRTMIN, SIGHUP, SIGSYS
#include <errno.h> // for errno
#include <stdbool.h> // for bool
#include <stdlib.h> // for strtol, NULL
#include <string.h> // for strcmp, strncmp, size_t
int str2sig(const char *restrict str, int *restrict pnum)
{
for (size_t i = SIGHUP; i <= SIGSYS; ++i) {
if (!strcmp(str, __sys_signame[i])) {
*pnum = i;
return 0;
}
}
if (strcmp(str, "RTMIN") == 0) {
*pnum = SIGRTMIN;
return 0;
}
if (strcmp(str, "RTMAX") == 0) {
*pnum = SIGRTMAX;
return 0;
}
int base = 0;
if (strncmp(str, "RTMIN+", 6) == 0) {
base = SIGRTMIN;
str += 5;
} else if (strncmp(str, "RTMAX-", 6) == 0) {
base = SIGRTMAX;
str += 5;
}
char *end = NULL;
errno = 0;
int offset = strtol(str, &end, 10);
if (errno || *end) {
return -1;
}
int result = base + offset;
bool regular = (base == 0 && result >= SIGHUP && result <= SIGSYS);
bool realtime = (result >= SIGRTMIN && result <= SIGRTMAX);
if (!regular && !realtime) {
return -1;
}
*pnum = result;
return 0;
}
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