diff options
Diffstat (limited to 'src/process/posix_spawn.c')
| -rw-r--r-- | src/process/posix_spawn.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/src/process/posix_spawn.c b/src/process/posix_spawn.c index 08644f51..08928b0e 100644 --- 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; @@ -92,14 +106,14 @@ static int child(void *args_vp) goto fail; 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 = __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); } |