1 files changed, 68 insertions, 0 deletions
diff --git a/src/Program.c b/src/Program.c
new file mode 100644
index 0000000..526f64b
--- /dev/null
+++ b/src/Program.c
@@ -0,0 +1,68 @@
+#include "../include/Program.h"
+#include <unistd.h>
+#include <sys/wait.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+#define READ_END 0
+#define WRITE_END 1
+
+int exec_program(char **args, ProgramOutputCallback output_callback, void *userdata) {
+    /* 1 arguments */
+    if(args[0] == NULL)
+        return -1;
+    
+    int fd[2];
+    if(pipe(fd) == -1) {
+        perror("Failed to open pipe");
+        return -2;
+    }
+
+    pid_t pid = fork();
+    if(pid == -1) {
+        perror("Failed to fork");
+        return -3;
+    } else if(pid == 0) { /* child */
+        dup2(fd[WRITE_END], STDOUT_FILENO);
+        close(fd[READ_END]);
+        close(fd[WRITE_END]);
+
+        execv(args[0], args);
+        return 0;
+    } else { /* parent */
+        close(fd[WRITE_END]);
+
+        int status;
+        waitpid(pid, &status, 0);
+        if(!WIFEXITED(status))
+            return -4;
+
+        int exit_status = WEXITSTATUS(status);
+        if(exit_status != 0) {
+            fprintf(stderr, "Failed to execute program, exit status %d\n", exit_status);
+            return -exit_status;
+        }
+
+        char buffer[2048];
+        int result = 0;
+
+        for(;;) {
+            ssize_t bytes_read = read(fd[READ_END], buffer, sizeof(buffer));
+            if(bytes_read == 0) {
+                break;
+            } else if(bytes_read == -1) {
+                int err = errno;
+                fprintf(stderr, "Failed to read from pipe to program %s, error: %s\n", args[0], strerror(err));
+                result = -err;
+                break;
+            }
+
+            if(output_callback(buffer, bytes_read, userdata) != 0)
+                break;
+        }
+
+        close(fd[READ_END]);
+        return result;
+    }
+}
+\ No newline at end of file