Add spawn wrapper for executing external commands

Inctroduce process.c and process.h providing spawn() function to fork
a child process and execute commands via execvp().

Return -1 on invalid arguments or fork failure, and 0 on success.

2 files changed, 34 insertions, 0 deletions

diff --git a/src/process.c b/src/process.c
new file mode 100644
index 0000000..3dd93f0
--- /dev/null
+++ b/src/process.c
@@ -0,0 +1,28 @@
+#include "process.h"
+#include "err.h"
+#include "log.h"
+#include <sys/wait.h>
+#include <unistd.h>
+
+int
+spawn(char **argv)
+{
+	pid_t pid;
+
+	if (!argv[0] || *argv[0] == '\0') {
+		log_write(LOG_ERR, "Invalid argv");
+		return -1;
+	}
+
+	if ((pid = fork()) < 0) {
+		log_write(LOG_ERR, "fork error");
+	} else if (pid == 0) {
+		if (execvp(argv[0], argv) < 0) {
+			die("exec error");
+		}
+	} else {
+		wait(NULL);
+	}
+
+	return 0;
+}
diff --git a/src/process.h b/src/process.h
new file mode 100644
index 0000000..b817fa9
--- /dev/null
+++ b/src/process.h
@@ -0,0 +1,6 @@
+#ifndef SF_PROCESS_H
+#define SF_PROCESS_H
+
+int spawn(char **argv);
+
+#endif /* SF_PROCESS_H */