[musl] [PATCH 1/2] signal: add sig2str(3) from POSIX.1-2024

[contact@hacktivis.me]

From: "Haelwenn (lanodan) Monnier" <contact@hacktivis.me>

---
 include/signal.h     |  3 +++
 src/signal/sig2str.c | 59 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 src/signal/sig2str.c

diff --git a/include/signal.h b/include/signal.h
index c347f861..217cfa08 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -233,6 +233,9 @@ int pthread_kill(pthread_t, int);
 void psiginfo(const siginfo_t *, const char *);
 void psignal(int, const char *);
 
+#define SIG2STR_MAX sizeof("RTMIN+32")
+int sig2str(int signum, char *str);
+
 #endif
 
 #if defined(_XOPEN_SOURCE) || defined(_BSD_SOURCE) || defined(_GNU_SOURCE)
diff --git a/src/signal/sig2str.c b/src/signal/sig2str.c
new file mode 100644
index 00000000..85f64ec6
--- /dev/null
+++ b/src/signal/sig2str.c
@@ -0,0 +1,59 @@
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+
+int sig2str(int signum, char *str)
+{
+	const char *name = NULL;
+	switch(signum)
+	{
+		case SIGHUP: name = "HUP"; break;
+		case SIGINT: name = "INT"; break;
+		case SIGQUIT: name = "QUIT"; break;
+		case SIGILL: name = "ILL"; break;
+		case SIGTRAP: name = "TRAP"; break;
+		case SIGABRT: name = "ABRT"; break;
+		case SIGBUS: name = "BUS"; break;
+		case SIGFPE: name = "FPE"; break;
+		case SIGKILL: name = "KILL"; break;
+		case SIGUSR1: name = "USR1"; break;
+		case SIGSEGV: name = "SEGV"; break;
+		case SIGUSR2: name = "USR2"; break;
+		case SIGPIPE: name = "PIPE"; break;
+		case SIGALRM: name = "ALRM"; break;
+		case SIGTERM: name = "TERM"; break;
+		case SIGSTKFLT: name = "STKFLT"; break;
+		case SIGCHLD: name = "CHLD"; break;
+		case SIGCONT: name = "CONT"; break;
+		case SIGSTOP: name = "STOP"; break;
+		case SIGTSTP: name = "TSTP"; break;
+		case SIGTTIN: name = "TTIN"; break;
+		case SIGTTOU: name = "TTOU"; break;
+		case SIGURG: name = "URG"; break;
+		case SIGXCPU: name = "XCPU"; break;
+		case SIGXFSZ: name = "XFSZ"; break;
+		case SIGVTALRM: name = "VTALRM"; break;
+		case SIGPROF: name = "PROF"; break;
+		case SIGWINCH: name = "WINCH"; break;
+		case SIGIO: name = "IO"; break;
+		case SIGPWR: name = "PWR"; break;
+		case SIGSYS: name = "SYS"; break;
+	}
+
+	// macros to functions can't be in switch-case
+	if(signum == SIGRTMIN) name = "RTMIN";
+	if(signum == SIGRTMAX) name = "RTMAX";
+
+	if(SIGRTMIN+1 <= signum && signum <= SIGRTMAX-1)
+	{
+		if(snprintf(str, SIG2STR_MAX, "RTMIN+%i", signum-SIGRTMIN) < 0) return -1;
+
+		return 0;
+	}
+
+	if(name == NULL) return -1;
+
+	strcpy(str, name);
+
+	return 0;
+}
-- 
2.44.2