From a0ae0b09368e6dbfa82860187dcd6fdf86d86fee Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sat, 28 May 2011 23:30:47 -0400
Subject: [PATCH] add file actions support to posix_spawn

---
 src/process/posix_spawn.c                     | 28 +++++++++++++++++++
 .../posix_spawn_file_actions_addclose.c       | 15 ++++++++++
 .../posix_spawn_file_actions_adddup2.c        | 16 +++++++++++
 .../posix_spawn_file_actions_addopen.c        | 19 +++++++++++++
 .../posix_spawn_file_actions_destroy.c        |  9 ++++--
 5 files changed, 85 insertions(+), 2 deletions(-)
 create mode 100644 src/process/posix_spawn_file_actions_addclose.c
 create mode 100644 src/process/posix_spawn_file_actions_adddup2.c
 create mode 100644 src/process/posix_spawn_file_actions_addopen.c

diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
index 7018c37e..59f4a8bb 100644
--- a/src/process/posix_spawn.c
+++ b/src/process/posix_spawn.c
@@ -2,7 +2,9 @@
 #include <unistd.h>
 #include <signal.h>
 #include <stdint.h>
+#include <fcntl.h>
 #include "syscall.h"
+#include "fdop.h"
 
 extern char **environ;
 
@@ -49,6 +51,32 @@ int __posix_spawnx(pid_t *res, const char *path,
 		__syscall(SYS_setuid, __syscall(SYS_getuid)) ))
 		_exit(127);
 
+	if (fa) {
+		struct fdop *op;
+		int ret, fd;
+		for (op = fa->__actions; op; op = op->next) {
+			switch(op->cmd) {
+			case FDOP_CLOSE:
+				ret = __syscall(SYS_close, op->fd);
+				break;
+			case FDOP_DUP2:
+				ret = __syscall(SYS_dup2, op->fd, op->newfd)<0;
+				break;
+			case FDOP_OPEN:
+				fd = __syscall(SYS_open, op->path,
+					op->oflag | O_LARGEFILE, op->mode);
+				if (fd == op->fd) {
+					ret = 0;
+				} else {
+					ret = __syscall(SYS_dup2, fd, op->fd)<0;
+					__syscall(SYS_close, fd);
+				}
+				break;
+			}
+			if (ret) _exit(127);
+		}
+	}
+
 	sigprocmask(SIG_SETMASK, (attr->__flags & POSIX_SPAWN_SETSIGMASK)
 		? &attr->__mask : &oldmask, 0);
 
diff --git a/src/process/posix_spawn_file_actions_addclose.c b/src/process/posix_spawn_file_actions_addclose.c
new file mode 100644
index 00000000..44c6314f
--- /dev/null
+++ b/src/process/posix_spawn_file_actions_addclose.c
@@ -0,0 +1,15 @@
+#include <spawn.h>
+#include <stdlib.h>
+#include <errno.h>
+#include "fdop.h"
+
+int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *fa, int fd)
+{
+	struct fdop *op = malloc(sizeof *op);
+	if (!op) return ENOMEM;
+	op->cmd = FDOP_CLOSE;
+	op->fd = fd;
+	op->next = fa->__actions;
+	fa->__actions = op;
+	return 0;
+}
diff --git a/src/process/posix_spawn_file_actions_adddup2.c b/src/process/posix_spawn_file_actions_adddup2.c
new file mode 100644
index 00000000..9209ee7c
--- /dev/null
+++ b/src/process/posix_spawn_file_actions_adddup2.c
@@ -0,0 +1,16 @@
+#include <spawn.h>
+#include <stdlib.h>
+#include <errno.h>
+#include "fdop.h"
+
+int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *fa, int fd, int newfd)
+{
+	struct fdop *op = malloc(sizeof *op);
+	if (!op) return ENOMEM;
+	op->cmd = FDOP_DUP2;
+	op->fd = fd;
+	op->newfd = newfd;
+	op->next = fa->__actions;
+	fa->__actions = op;
+	return 0;
+}
diff --git a/src/process/posix_spawn_file_actions_addopen.c b/src/process/posix_spawn_file_actions_addopen.c
new file mode 100644
index 00000000..5e2c86d9
--- /dev/null
+++ b/src/process/posix_spawn_file_actions_addopen.c
@@ -0,0 +1,19 @@
+#include <spawn.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include "fdop.h"
+
+int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *fa, int fd, const char *path, int flags, mode_t mode)
+{
+	struct fdop *op = malloc(sizeof *op + strlen(path) + 1);
+	if (!op) return ENOMEM;
+	op->cmd = FDOP_OPEN;
+	op->fd = fd;
+	op->oflag = flags;
+	op->mode = mode;
+	strcpy(op->path, path);
+	op->next = fa->__actions;
+	fa->__actions = op;
+	return 0;
+}
diff --git a/src/process/posix_spawn_file_actions_destroy.c b/src/process/posix_spawn_file_actions_destroy.c
index c2501ddf..3251babb 100644
--- a/src/process/posix_spawn_file_actions_destroy.c
+++ b/src/process/posix_spawn_file_actions_destroy.c
@@ -1,9 +1,14 @@
 #include <spawn.h>
 #include <stdlib.h>
+#include "fdop.h"
 
 int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *fa)
 {
-	// FIXME
-	free(fa->__actions);
+	struct fdop *op = fa->__actions, *next;
+	while (op) {
+		next = op->next;
+		free(op);
+		op = next;
+	}
 	return 0;
 }
-- 
2.25.1