aboutsummaryrefslogtreecommitdiff
path: root/lib/lib.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/lib.c')
-rw-r--r--lib/lib.c81
1 files changed, 65 insertions, 16 deletions
diff --git a/lib/lib.c b/lib/lib.c
index ffb24f65..17af3c35 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -454,6 +454,16 @@ int strstart(char **a, char *b)
return i;
}
+// If *a starts with b, advance *a past it and return 1, else return 0;
+int strcasestart(char **a, char *b)
+{
+ int len = strlen(b), i = !strncasecmp(*a, b, len);
+
+ if (i) *a += len;
+
+ return i;
+}
+
// Return how long the file at fd is, if there's any way to determine it.
off_t fdlength(int fd)
{
@@ -843,21 +853,22 @@ struct signame {
#define SIGNIFY(x) {SIG##x, #x}
static struct signame signames[] = {
+ // POSIX
SIGNIFY(ABRT), SIGNIFY(ALRM), SIGNIFY(BUS),
SIGNIFY(FPE), SIGNIFY(HUP), SIGNIFY(ILL), SIGNIFY(INT), SIGNIFY(KILL),
SIGNIFY(PIPE), SIGNIFY(QUIT), SIGNIFY(SEGV), SIGNIFY(TERM),
SIGNIFY(USR1), SIGNIFY(USR2), SIGNIFY(SYS), SIGNIFY(TRAP),
SIGNIFY(VTALRM), SIGNIFY(XCPU), SIGNIFY(XFSZ),
+ // Non-POSIX terminal signals
+ SIGNIFY(STKFLT), SIGNIFY(PROF), SIGNIFY(POLL), SIGNIFY(IO), SIGNIFY(PWR),
- // Start of non-terminal signals
-
+ // POSIX non-terminal signals
SIGNIFY(CHLD), SIGNIFY(CONT), SIGNIFY(STOP), SIGNIFY(TSTP),
- SIGNIFY(TTIN), SIGNIFY(TTOU), SIGNIFY(URG)
+ SIGNIFY(TTIN), SIGNIFY(TTOU), SIGNIFY(URG),
+ // Non-POSIX non-terminal signals
+ SIGNIFY(WINCH),
};
-// not in posix: SIGNIFY(STKFLT), SIGNIFY(WINCH), SIGNIFY(IO), SIGNIFY(PWR)
-// obsolete: SIGNIFY(PROF) SIGNIFY(POLL)
-
// Handler that sets toys.signal, and writes to toys.signalfd if set
void generic_signal(int sig)
{
@@ -898,22 +909,35 @@ void sigatexit(void *handler)
}
}
-// Convert name to signal number. If name == NULL print names.
+// Convert a string like "9", "KILL", "SIGHUP", or "SIGRTMIN+2" to a number.
int sig_to_num(char *pidstr)
{
- int i;
+ int i, offset;
+ char *s;
- if (pidstr) {
- char *s;
+ // Numeric?
+ i = estrtol(pidstr, &s, 10);
+ if (!errno && !*s) return i;
- i = estrtol(pidstr, &s, 10);
- if (!errno && !*s) return i;
+ // Skip leading "SIG".
+ strcasestart(&pidstr, "sig");
- if (!strncasecmp(pidstr, "sig", 3)) pidstr+=3;
- }
+ // Named signal?
for (i=0; i<ARRAY_LEN(signames); i++)
- if (!pidstr) xputs(signames[i].name);
- else if (!strcasecmp(pidstr, signames[i].name)) return signames[i].num;
+ if (!strcasecmp(pidstr, signames[i].name)) return signames[i].num;
+
+ // Real-time signal?
+ if (strcasestart(&pidstr, "rtmin")) i = SIGRTMIN;
+ else if (strcasestart(&pidstr, "rtmax")) i = SIGRTMAX;
+ else return -1;
+ // No offset?
+ if (!*pidstr) return i;
+ // We allow any offset that's still a real-time signal: SIGRTMIN+20 is fine.
+ // Others are more restrictive, only accepting what they show with -l.
+ offset = estrtol(pidstr, &s, 10);
+ if (errno || *s) return -1;
+ i += offset;
+ if (i >= SIGRTMIN && i <= SIGRTMAX) return i;
return -1;
}
@@ -922,11 +946,36 @@ char *num_to_sig(int sig)
{
int i;
+ // A named signal?
for (i=0; i<ARRAY_LEN(signames); i++)
if (signames[i].num == sig) return signames[i].name;
+
+ // A real-time signal?
+ if (sig == SIGRTMIN) return "RTMIN";
+ if (sig == SIGRTMAX) return "RTMAX";
+ if (sig > SIGRTMIN && sig < SIGRTMAX) {
+ if (sig-SIGRTMIN <= SIGRTMAX-sig) sprintf(libbuf, "RTMIN+%d", sig-SIGRTMIN);
+ else sprintf(libbuf, "RTMAX-%d", SIGRTMAX-sig);
+ return libbuf;
+ }
return NULL;
}
+// Output a nicely formatted 80-column table of all the signals.
+void list_signals()
+{
+ int i = 0, count = 0;
+ char *name;
+
+ for (; i<=SIGRTMAX; i++) {
+ if ((name = num_to_sig(i))) {
+ printf("%2d) SIG%-9s", i, name);
+ if (++count % 5 == 0) putchar('\n');
+ }
+ }
+ putchar('\n');
+}
+
// premute mode bits based on posix mode strings.
mode_t string_to_mode(char *modestr, mode_t mode)
{