initial commit

git-svn-id: file:///home/lennart/svn/public/bidilink/trunk@3 9cde1c1d-e4d0-0310-8a68-bf217395ea82

1 files changed, 67 insertions, 0 deletions

diff --git a/src/exec.c b/src/exec.c
new file mode 100644
index 0000000..db4345e
--- /dev/null
+++ b/src/exec.c
@@ -0,0 +1,67 @@
+#include <unistd.h>
+#include <sys/types.h>
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#include "exec.h"
+
+static void close_pipe(int p[2]) {
+    if (p[0] >= 0)
+        close(p[0]);
+
+    if (p[1] >= 0)
+        close(p[1]);
+}
+
+struct stream* stream_exec(const char *args) {
+    struct stream *s = NULL;
+    int stdout_pipe[2];
+    int stdin_pipe[2];
+    pid_t pid;
+
+    s = malloc(sizeof(struct stream));
+    assert(s);
+    memset(s, 0, sizeof(struct stream));    
+
+    if (pipe(stdin_pipe) < 0 || pipe(stdout_pipe) < 0) {
+        fprintf(stderr, "pipe(): %s\n", strerror(errno));
+        goto fail;
+    }
+
+    if ((pid = fork()) < 0) {
+        fprintf(stderr, "fork(): %s\n", strerror(errno));
+        goto fail;
+    } else if (pid == 0) {
+        close(stdin_pipe[1]);
+        close(stdout_pipe[0]);
+
+        if (dup2(stdin_pipe[0], 0) < 0 || dup2(stdout_pipe[1], 1) < 0) {
+            fprintf(stderr, "dup2(): %s\n", strerror(errno));
+            exit(1);
+        }
+
+        execl("/bin/sh", "/bin/sh", "-c", args, NULL);
+
+        fprintf(stderr, "exec(): %s\n", strerror(errno));
+        exit(1);
+    }
+    
+    s->output_fd = stdin_pipe[1];
+    close(stdin_pipe[0]);
+    s->input_fd = stdout_pipe[0];
+    close(stdout_pipe[1]);
+    
+    return s;
+    
+fail:
+
+    free(s);
+
+    close_pipe(stdout_pipe);
+    close_pipe(stdin_pipe);
+    
+    return NULL;
+}