5 files changed, 93 insertions, 5 deletions

diff --git a/lib/libc/signal/Kbuild b/lib/libc/signal/Kbuild
index b8881c92..f8122caf 100644
--- a/lib/libc/signal/Kbuild
+++ b/lib/libc/signal/Kbuild
@@ -19,3 +19,4 @@ obj-y += sigtimedwait.o
 obj-y += sigwait.o
 obj-y += sigwaitinfo.o
 obj-y += str2sig.o
+obj-y += sysv_signal.o
diff --git a/lib/libc/signal/sig2str.c b/lib/libc/signal/sig2str.c
index 209cb4c3..2532d539 100644
--- a/lib/libc/signal/sig2str.c
+++ b/lib/libc/signal/sig2str.c
@@ -6,25 +6,28 @@
 int sig2str(int signum, char *str)
 {
 	if (signum >= SIGHUP && signum <= SIGSYS) {
-		strcpy(str, __sys_signame[signum - SIGHUP]);
+		strlcpy(str, __sys_signame[signum - SIGHUP],
+			sizeof(__sys_signame[signum - SIGHUP]));
 		return 0;
 	}
 
 	if (signum == SIGRTMIN) {
-		strcpy(str, "SIGRTMIN");
+		strlcpy(str, "SIGRTMIN", sizeof("SIGRTMIN"));
 		return 0;
 	}
 
 	if (signum == SIGRTMAX) {
-		strcpy(str, "RTMAX");
+		strlcpy(str, "SIGRTMAX", sizeof("SIGRTMAX"));
 		return 0;
 	}
 
 	if (signum > SIGRTMIN && signum < SIGRTMAX) {
 		if (signum - SIGRTMIN <= SIGRTMAX - signum) {
-			sprintf(str, "RTMIN+%d", signum - SIGRTMIN);
+			snprintf(str, sizeof("RTMIN+") + 1, "RTMIN+%d",
+				 signum - SIGRTMIN);
 		} else {
-			sprintf(str, "RTMAX-%d", SIGRTMAX - signum);
+			snprintf(str, sizeof("RTMAX-") + 1, "RTMAX-%d",
+				 SIGRTMAX - signum);
 		}
 		return 0;
 	}
diff --git a/lib/libc/signal/sigabbrev.h b/lib/libc/signal/sigabbrev.h
new file mode 100644
index 00000000..fa0ef1ce
--- /dev/null
+++ b/lib/libc/signal/sigabbrev.h
@@ -0,0 +1,22 @@
+#include <signal.h>
+#include <unistd.h>
+
+const char *const sys_sigabbrev[64] = {
+	[SIGABRT] = "ABRT",   [SIGALRM] = "ALRM",     [SIGBUS] = "BUS",
+	[SIGCHLD] = "CHLD",   [SIGFPE] = "FPE",	      [SIGHUP] = "HUP",
+	[SIGILL] = "ILL",     [SIGINT] = "INT",	      [SIGIO] = "IO",
+#if defined(SIGIOT) && (SIGIOT != SIGABRT)
+	[SIGIOT] = "IOT",
+#endif
+	[SIGKILL] = "KILL",   [SIGPIPE] = "PIPE",
+#if defined(SIGPOLL) && (SIGPOLL != SIGIO)
+	[SIGPOLL] = "POLL",
+#endif
+	[SIGPROF] = "PROF",   [SIGPWR] = "PWR",	      [SIGQUIT] = "QUIT",
+	[SIGSEGV] = "SEGV",   [SIGSTKFLT] = "STKFLT", [SIGSTOP] = "STOP",
+	[SIGSYS] = "SYS",     [SIGTERM] = "TERM",     [SIGTSTP] = "TSTP",
+	[SIGTTIN] = "TTIN",   [SIGTTOU] = "TTOU",     [SIGURG] = "URG",
+	[SIGUSR1] = "USR1",   [SIGUSR2] = "USR2",     [SIGVTALRM] = "VTALRM",
+	[SIGWINCH] = "WINCH", [SIGXCPU] = "XCPU",     [SIGXFSZ] = "XFSZ",
+	[SIGCONT] = "CONT",   [SIGTRAP] = "TRAP",
+};
diff --git a/lib/libc/signal/siglist.c b/lib/libc/signal/siglist.c
new file mode 100644
index 00000000..ba9ec746
--- /dev/null
+++ b/lib/libc/signal/siglist.c
@@ -0,0 +1,47 @@
+#include <signal.h>
+#include <unistd.h>
+
+const char *const sys_siglist[64] = {
+	[SIGABRT] = "Aborted",
+	[SIGALRM] = "Alarm clock",
+	[SIGBUS] = "Bus error",
+	[SIGCHLD] = "Child exited",
+#if defined(SIGCLD) && (SIGCHLD != SIGCLD)
+	[SIGCLD] = "Child exited",
+#endif
+	[SIGHUP] = "Hangup",
+	[SIGILL] = "Illegal instruction",
+	[SIGINT] = "Interrupt",
+	[SIGIO] = "I/O possible",
+#if defined(SIGIOT) && (SIGIOT != SIGABRT)
+	[SIGIOT] = "I/O trap",
+#endif
+	[SIGKILL] = "Killed",
+#if defined(SIGLOST) && (SIGLOST != SIGIO) && (SIGLOST != SIGPWR)
+	[SIGLOST] = "Lock lost",
+#endif
+	[SIGPIPE] = "Broken pipe",
+#if defined(SIGPOLL) && (SIGPOLL != SIGIO)
+	[SIGPOLL] = "Pollable event",
+#endif
+	[SIGPROF] = "Profiling timer expired",
+	[SIGPWR] = "Power failure",
+	[SIGQUIT] = "Quit",
+	[SIGSEGV] = "Segment violation",
+	[SIGSTKFLT] = "Stack fault",
+	[SIGSTOP] = "Stopped (signal)",
+	[SIGSYS] = "Bad system call",
+	[SIGTERM] = "Terminated",
+	[SIGTSTP] = "Stopped",
+	[SIGTTIN] = "Stopped (tty input)",
+	[SIGTTOU] = "Stopped (tty output)",
+	[SIGURG] = "Urgent I/O condition",
+	[SIGUSR1] = "User signal 1",
+	[SIGUSR2] = "User signal 2",
+	[SIGVTALRM] = "Virtual timer expired",
+	[SIGWINCH] = "Window size changed",
+	[SIGXCPU] = "CPU time limit exceeded",
+	[SIGXFSZ] = "File size limit exceeded",
+	[SIGTRAP] = "Trace/breakpoint trap",
+	[SIGCONT] = "Continue",
+};
diff --git a/lib/libc/signal/sysv_signal.c b/lib/libc/signal/sysv_signal.c
new file mode 100644
index 00000000..2aa0221a
--- /dev/null
+++ b/lib/libc/signal/sysv_signal.c
@@ -0,0 +1,15 @@
+#include <signal.h>
+
+sighandler_t sysv_signal(int signum, sighandler_t handler)
+{
+	struct sigaction new_action, old_action;
+
+	new_action.sa_handler = handler;
+	sigemptyset(&new_action.sa_mask);
+	new_action.sa_flags = 0;
+
+	if (sigaction(signum, &new_action, &old_action) < 0)
+		return SIG_ERR;
+
+	return old_action.sa_handler;
+}