1 files changed, 49 insertions, 0 deletions
diff --git a/libc/stdio/popen.c b/libc/stdio/popen.c
new file mode 100644
index 000000000..a07c411eb
--- /dev/null
+++ b/libc/stdio/popen.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+
+FILE *popen(command, rw)
+char *command;
+char *rw;
+{
+	int pipe_fd[2];
+	int pid, reading;
+
+	if (pipe(pipe_fd) < 0)
+		return NULL;
+	reading = (rw[0] == 'r');
+
+	pid = vfork();
+	if (pid < 0) {
+		close(pipe_fd[0]);
+		close(pipe_fd[1]);
+		return NULL;
+	}
+	if (pid == 0) {
+		close(pipe_fd[!reading]);
+		close(reading);
+		if (pipe_fd[reading] != reading) {
+			dup2(pipe_fd[reading], reading);
+			close(pipe_fd[reading]);
+		}
+
+		execl("/bin/sh", "sh", "-c", command, (char *) 0);
+		_exit(255);
+	}
+
+	close(pipe_fd[reading]);
+	return fdopen(pipe_fd[!reading], rw);
+}
+
+int pclose(fd)
+FILE *fd;
+{
+	int waitstat;
+
+	if (fclose(fd) != 0)
+		return EOF;
+	wait(&waitstat);
+	return waitstat;
+}