win32: ash: evalbackcmd

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 007009245..2b9b2226e 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -5923,6 +5923,7 @@ struct backcmd {                /* result of evalbackcmd */
         int fd;                 /* file descriptor to read from */
         int nleft;              /* number of chars in buffer */
         char *buf;              /* buffer */
+        IF_PLATFORM_MINGW32(struct forkshell fs);
         struct job *jp;         /* job structure for command */
 };
 
@@ -5931,6 +5932,25 @@ static uint8_t back_exitstatus; /* exit status of backquoted command */
 #define EV_EXIT 01              /* exit after evaluating tree */
 static void evaltree(union node *, int);
 
+#if ENABLE_PLATFORM_MINGW32
+static void
+forkshell_evalbackcmd(struct forkshell *fs)
+{
+        union node *n = fs->n;
+        int pip[2] = {fs->fd[0], fs->fd[1]};
+
+        FORCE_INT_ON;
+        close(pip[0]);
+        if (pip[1] != 1) {
+                /*close(1);*/
+                copyfd(pip[1], 1 | COPYFD_EXACT);
+                close(pip[1]);
+        }
+        eflag = 0;
+        evaltree(n, EV_EXIT); /* actually evaltreenr... */
+        /* NOTREACHED */
+}
+#endif
 static void FAST_FUNC
 evalbackcmd(union node *n, struct backcmd *result)
 {
@@ -5939,6 +5959,7 @@ evalbackcmd(union node *n, struct backcmd *result)
         result->fd = -1;
         result->buf = NULL;
         result->nleft = 0;
+        IF_PLATFORM_MINGW32(memset(&result->fs, 0, sizeof(result->fs)));
         result->jp = NULL;
         if (n == NULL)
                 goto out;
@@ -5953,6 +5974,14 @@ evalbackcmd(union node *n, struct backcmd *result)
                 if (pipe(pip) < 0)
                         ash_msg_and_raise_error("pipe call failed");
                 jp = makejob(/*n,*/ 1);
+#if ENABLE_PLATFORM_MINGW32
+                result->fs.fp = forkshell_evalbackcmd;
+                result->fs.n = n;
+                result->fs.fd[0] = pip[0];
+                result->fs.fd[1] = pip[1];
+                if (spawn_forkshell(jp, &result->fs, FORK_NOJOB) < 0)
+                        ash_msg_and_raise_error("unable to spawn shell");
+#endif
                 if (forkshell(jp, n, FORK_NOJOB) == 0) {
                         FORCE_INT_ON;
                         close(pip[0]);
@@ -13215,6 +13244,7 @@ extern int etext();
 #if ENABLE_PLATFORM_MINGW32
 static const forkpoint_fn forkpoints[] = {
         forkshell_openhere,
+        forkshell_evalbackcmd,
         NULL
 };