shell: Sym 'shell' to execute shell commands. Don't have command parameters yet

plugins/shell/shell.c

@@ -9,6 +9,10 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <limits.h>
 
 #include <faux/str.h>
 #include <faux/list.h>
@@ -16,18 +20,78 @@
 #include <klish/ksession.h>
 
 
+static char *shell_mkfifo(void)
+{
+	int res = 0;
+	char *name = NULL;
+
+	name = faux_str_sprintf("/tmp/klish.fifo.%u.XXXXXX", getpid());
+	mktemp(name);
+	if (mkfifo(name, 0600) < 0) {
+		faux_str_free(name);
+		return NULL;
+	}
+
+	return name;
+}
+
+
 // Execute shell script
 int shell_shell(kcontext_t *context)
 {
 	const char *script = NULL;
+	pid_t cpid = -1;
+	int res = -1;
+	char *fifo_name = NULL;
+	FILE *wpipe = NULL;
+	char *command = NULL;
 
 	script = kcontext_script(context);
 	if (faux_str_is_empty(script))
 		return 0;
 
-//	printf("%s", prompt);
-//	faux_str_free(prompt);
-//	fflush(stdout);
+	// Create FIFO
+	if (!(fifo_name = shell_mkfifo())) {
+		fprintf(stderr, "Error: Can't create temporary FIFO.\n"
+			"Error: The ACTION will be not executed.\n");
+		return -1;
+	}
+
+	// Create process to write to FIFO
+	cpid = fork();
+	if (cpid == -1) {
+		fprintf(stderr, "Error: Can't fork the write process.\n"
+			"Error: The ACTION will be not executed.\n");
+		unlink(fifo_name);
+		faux_str_free(fifo_name);
+		return -1;
+	}
+
+	// Child: write to FIFO
+	if (cpid == 0) {
+		wpipe = fopen(fifo_name, "w");
+		if (!wpipe)
+			_exit(-1);
+		fwrite(script, strlen(script), 1, wpipe);
+		fflush(wpipe);
+		fclose(wpipe);
+		_exit(0);
+	}
+
+	// Parent
+	// Prepare command
+	command = faux_str_sprintf("/bin/sh %s", fifo_name);
+
+	res = system(command);
+
+	// Wait for the writing process
+	kill(cpid, SIGTERM);
+	while (waitpid(cpid, NULL, 0) != cpid);
+
+	// Clean up
+	faux_str_free(command);
+	unlink(fifo_name);
+	faux_str_free(fifo_name);
 
-	return 0;
+	return WEXITSTATUS(res);
 }