recognize partial register operands in i386 CFI generation

[musl] / src / process / posix_spawn.c

diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c
index f675a13..0bdf71c 100644 (file)
--- a/src/process/posix_spawn.c
+++ b/src/process/posix_spawn.c
@@ -22,6 +22,20 @@ struct args {
 
 void __get_handler_set(sigset_t *);
 
+static int __sys_dup2(int old, int new)
+{
+#ifdef SYS_dup2
+       return __syscall(SYS_dup2, old, new);
+#else
+       if (old==new) {
+               int r = __syscall(SYS_fcntl, old, F_GETFD);
+               return r<0 ? r : old;
+       } else {
+               return __syscall(SYS_dup3, old, new, 0);
+       }
+#endif
+}
+
 static int child(void *args_vp)
 {
        int i, ret;
@@ -63,9 +77,9 @@ static int child(void *args_vp)
                if ((ret=__syscall(SYS_setpgid, 0, attr->__pgrp)))
                        goto fail;
 
-       /* Use syscalls directly because pthread state because the
-        * library functions attempt to do a multi-threaded synchronized
-        * id-change, which would trash the parent's state. */
+       /* Use syscalls directly because the library functions attempt
+        * to do a multi-threaded synchronized id-change, which would
+        * trash the parent's state. */
        if (attr->__flags & POSIX_SPAWN_RESETIDS)
                if ((ret=__syscall(SYS_setgid, __syscall(SYS_getgid))) ||
                    (ret=__syscall(SYS_setuid, __syscall(SYS_getuid))) )
@@ -88,19 +102,17 @@ static int child(void *args_vp)
                        }
                        switch(op->cmd) {
                        case FDOP_CLOSE:
-                               if ((ret=__syscall(SYS_close, op->fd)))
-                                       goto fail;
+                               __syscall(SYS_close, op->fd);
                                break;
                        case FDOP_DUP2:
-                               if ((ret=__syscall(SYS_dup2, op->srcfd, op->fd))<0)
+                               if ((ret=__sys_dup2(op->srcfd, op->fd))<0)
                                        goto fail;
                                break;
                        case FDOP_OPEN:
-                               fd = __syscall(SYS_open, op->path,
-                                       op->oflag | O_LARGEFILE, op->mode);
+                               fd = __sys_open(op->path, op->oflag, op->mode);
                                if ((ret=fd) < 0) goto fail;
                                if (fd != op->fd) {
-                                       if ((ret=__syscall(SYS_dup2, fd, op->fd))<0)
+                                       if ((ret=__sys_dup2(fd, op->fd))<0)
                                                goto fail;
                                        __syscall(SYS_close, fd);
                                }
@@ -124,7 +136,7 @@ static int child(void *args_vp)
 fail:
        /* Since sizeof errno < PIPE_BUF, the write is atomic. */
        ret = -ret;
-       if (ret) while (write(p, &ret, sizeof ret) < 0);
+       if (ret) while (__syscall(SYS_write, p, &ret, sizeof ret) < 0);
        _exit(127);
 }