2 * Copyright (C) 2009 Pierre-Marc Fournier
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; version 2.1 of
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include <lttng/ust.h>
35 static pid_t (*plibc_func
)(void) = NULL
;
39 if (plibc_func
== NULL
) {
40 plibc_func
= dlsym(RTLD_NEXT
, "fork");
41 if (plibc_func
== NULL
) {
42 fprintf(stderr
, "libustfork: unable to find \"fork\" symbol\n");
47 ust_before_fork(&sigset
);
48 /* Do the real fork */
49 retval
= plibc_func();
52 ust_after_fork_child(&sigset
);
54 ust_after_fork_parent(&sigset
);
59 int daemon(int nochdir
, int noclose
)
61 static int (*plibc_func
)(int nochdir
, int noclose
) = NULL
;
65 if (plibc_func
== NULL
) {
66 plibc_func
= dlsym(RTLD_NEXT
, "daemon");
67 if (plibc_func
== NULL
) {
68 fprintf(stderr
, "libustfork: unable to find \"daemon\" symbol\n");
74 ust_before_fork(&sigset
);
75 /* Do the real daemon call */
76 retval
= plibc_func(nochdir
, noclose
);
78 /* child, parent called _exit() directly */
79 ust_after_fork_child(&sigset
);
81 /* on error in the parent */
82 ust_after_fork_parent(&sigset
);
87 struct ustfork_clone_info
{
93 static int clone_fn(void *arg
)
95 struct ustfork_clone_info
*info
= (struct ustfork_clone_info
*) arg
;
97 /* clone is now done and we are in child */
98 ust_after_fork_child(&info
->sigset
);
99 return info
->fn(info
->arg
);
102 int clone(int (*fn
)(void *), void *child_stack
, int flags
, void *arg
, ...)
104 static int (*plibc_func
)(int (*fn
)(void *), void *child_stack
,
105 int flags
, void *arg
, pid_t
*ptid
,
106 struct user_desc
*tls
, pid_t
*ctid
) = NULL
;
109 struct user_desc
*tls
;
111 /* end of var args */
116 ptid
= va_arg(ap
, pid_t
*);
117 tls
= va_arg(ap
, struct user_desc
*);
118 ctid
= va_arg(ap
, pid_t
*);
121 if (plibc_func
== NULL
) {
122 plibc_func
= dlsym(RTLD_NEXT
, "clone");
123 if (plibc_func
== NULL
) {
124 fprintf(stderr
, "libustfork: unable to find \"clone\" symbol.\n");
129 if (flags
& CLONE_VM
) {
131 * Creating a thread, no need to intervene, just pass on
134 retval
= plibc_func(fn
, child_stack
, flags
, arg
, ptid
,
137 /* Creating a real process, we need to intervene. */
138 struct ustfork_clone_info info
= { .fn
= fn
, .arg
= arg
};
140 ust_before_fork(&info
.sigset
);
141 retval
= plibc_func(clone_fn
, child_stack
, flags
, &info
,
143 /* The child doesn't get here. */
144 ust_after_fork_parent(&info
.sigset
);
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