mirror of
https://github.com/uselessd/alcove.git
synced 2026-04-17 18:26:27 +00:00
aa306a6ab2
I go back and forth with this: be explicit or brief. Especially with
strcmp() where I always WTF.
The code is simpler and easier to read when the checks are explicit. For
example:
// NULL pointer or integer?
if (!x) return;
107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/* Copyright (c) 2014, Michael Santos <michael.santos@gmail.com>
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
#include "alcove.h"
|
|
#include "alcove_call.h"
|
|
#include "alcove_fork.h"
|
|
#include "alcove_clone_constants.h"
|
|
|
|
/*
|
|
* clone(2)
|
|
*
|
|
*/
|
|
ssize_t
|
|
alcove_sys_clone(alcove_state_t *ap, const char *arg, size_t len,
|
|
char *reply, size_t rlen)
|
|
{
|
|
#ifdef __linux__
|
|
int index = 0;
|
|
int rindex = 0;
|
|
|
|
alcove_arg_t child_arg = {0};
|
|
alcove_stdio_t fd = {{0}};
|
|
struct rlimit stack_size = {0};
|
|
char *child_stack = NULL;
|
|
int flags = 0;
|
|
pid_t pid = 0;
|
|
int errnum = 0;
|
|
sigset_t oldset;
|
|
sigset_t set;
|
|
|
|
if (ap->depth >= ap->maxforkdepth)
|
|
return alcove_mk_errno(reply, rlen, EAGAIN);
|
|
|
|
if (pid_foreach(ap, 0, NULL, NULL, pid_equal, avail_pid) != 0)
|
|
return alcove_mk_errno(reply, rlen, EAGAIN);
|
|
|
|
/* flags */
|
|
switch (alcove_decode_define_list(arg, len, &index, &flags,
|
|
alcove_clone_constants)) {
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
return alcove_mk_error(reply, rlen, "unsupported");
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
if (getrlimit(RLIMIT_STACK, &stack_size) < 0)
|
|
return alcove_mk_errno(reply, rlen, errno);
|
|
|
|
child_stack = calloc(stack_size.rlim_cur, 1);
|
|
if (child_stack == NULL)
|
|
return alcove_mk_errno(reply, rlen, errno);
|
|
|
|
if (alcove_stdio(&fd) < 0)
|
|
goto ERROR;
|
|
|
|
(void)sigfillset(&set);
|
|
(void)sigemptyset(&oldset);
|
|
|
|
if (sigprocmask(SIG_BLOCK, &set, &oldset) < 0)
|
|
goto ERROR;
|
|
|
|
child_arg.ap = ap;
|
|
child_arg.fd = &fd;
|
|
child_arg.sigset = &oldset;
|
|
|
|
pid = clone(alcove_child_fun, child_stack + stack_size.rlim_cur,
|
|
flags | SIGCHLD, &child_arg);
|
|
|
|
if (sigprocmask(SIG_SETMASK, &oldset, NULL) < 0)
|
|
goto ERROR;
|
|
|
|
if (pid < 0)
|
|
goto ERROR;
|
|
|
|
free(child_stack);
|
|
|
|
if (alcove_parent_fd(ap, &fd, pid) < 0)
|
|
return alcove_mk_errno(reply, rlen, errno);
|
|
|
|
ALCOVE_OK(reply, &rindex,
|
|
alcove_encode_long(reply, rlen, &rindex, pid)
|
|
);
|
|
|
|
return rindex;
|
|
|
|
ERROR:
|
|
errnum = errno;
|
|
free(child_stack);
|
|
return alcove_mk_errno(reply, rlen, errnum);
|
|
#else
|
|
return alcove_mk_atom(reply, rlen, "undef");
|
|
#endif
|
|
}
|