initial check-in, version 0.5.0v0.5.0

1 files changed, 45 insertions, 0 deletions

diff --git a/src/process/system.c b/src/process/system.c
new file mode 100644
index 00000000..0f1c07b5
--- /dev/null
+++ b/src/process/system.c
@@ -0,0 +1,45 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <errno.h>
+
+int system(const char *cmd)
+{
+	pid_t pid;
+	sigset_t old, new;
+	struct sigaction sa, oldint, oldquit;
+	int status;
+
+	if (!cmd) return 1;
+
+	sa.sa_handler = SIG_IGN;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = 0;
+
+	sigaction(SIGINT, &sa, &oldint);
+	sigaction(SIGQUIT, &sa, &oldquit);
+	sigaddset(&sa.sa_mask, SIGCHLD);
+	sigprocmask(SIG_BLOCK, &new, &old);
+
+	pid = fork();
+	if (pid <= 0) {
+		sigaction(SIGINT, &oldint, NULL);
+		sigaction(SIGQUIT, &oldquit, NULL);
+		sigprocmask(SIG_SETMASK, &old, NULL);
+		if (pid == 0) {
+			execl("/bin/sh", "sh", "-c", cmd, (char *)0);
+			_exit(127);
+		}
+		return -1;
+	}
+	while (waitpid(pid, &status, 0) == -1)
+		if (errno != EINTR) {
+			status = -1;
+			break;
+		}
+	sigaction(SIGINT, &oldint, NULL);
+	sigaction(SIGQUIT, &oldquit, NULL);
+	sigprocmask(SIG_SETMASK, &old, NULL);
+	return status;
+}