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std.process.Child: fix spawning child proc with new cwd fd

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Before this fix, the dup2 of the progress pipe was clobbering the cwd
fd, causing the fchdir to return ENOTDIR in between fork() and exec().
This commit is contained in:
Andrew Kelley 2024-05-27 15:55:32 -07:00
parent b7889f262a
commit 947a3a1be9
1 changed files with 4 additions and 1 deletions
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5
lib/std/process/Child.zig
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@ -654,7 +654,6 @@ fn spawnPosix(self: *ChildProcess) SpawnError!void {
setUpChildIo(self.stdin_behavior, stdin_pipe[0], posix.STDIN_FILENO, dev_null_fd) catch |err| forkChildErrReport(err_pipe[1], err);
setUpChildIo(self.stdout_behavior, stdout_pipe[1], posix.STDOUT_FILENO, dev_null_fd) catch |err| forkChildErrReport(err_pipe[1], err);
setUpChildIo(self.stderr_behavior, stderr_pipe[1], posix.STDERR_FILENO, dev_null_fd) catch |err| forkChildErrReport(err_pipe[1], err);
if (prog_pipe[1] != -1) posix.dup2(prog_pipe[1], prog_fileno) catch |err| forkChildErrReport(err_pipe[1], err);
if (self.cwd_dir) |cwd| {
posix.fchdir(cwd.fd) catch |err| forkChildErrReport(err_pipe[1], err);
@ -662,6 +661,10 @@ fn spawnPosix(self: *ChildProcess) SpawnError!void {
posix.chdir(cwd) catch |err| forkChildErrReport(err_pipe[1], err);
}
// Must happen after fchdir above, the cwd file descriptor might be
// equal to prog_fileno and be clobbered by this dup2 call.
if (prog_pipe[1] != -1) posix.dup2(prog_pipe[1], prog_fileno) catch |err| forkChildErrReport(err_pipe[1], err);
if (self.gid) |gid| {
posix.setregid(gid, gid) catch |err| forkChildErrReport(err_pipe[1], err);
}