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>
33 static pid_t (*plibc_func
)(void) = NULL
;
37 if (plibc_func
== NULL
) {
38 plibc_func
= dlsym(RTLD_NEXT
, "fork");
39 if (plibc_func
== NULL
) {
40 fprintf(stderr
, "libustfork: unable to find \"fork\" symbol\n");
45 ust_before_fork(&sigset
);
46 /* Do the real fork */
47 retval
= plibc_func();
50 ust_after_fork_child(&sigset
);
52 ust_after_fork_parent(&sigset
);
57 int daemon(int nochdir
, int noclose
)
59 static int (*plibc_func
)(int nochdir
, int noclose
) = NULL
;
63 if (plibc_func
== NULL
) {
64 plibc_func
= dlsym(RTLD_NEXT
, "daemon");
65 if (plibc_func
== NULL
) {
66 fprintf(stderr
, "libustfork: unable to find \"daemon\" symbol\n");
72 ust_before_fork(&sigset
);
73 /* Do the real daemon call */
74 retval
= plibc_func(nochdir
, noclose
);
76 /* child, parent called _exit() directly */
77 ust_after_fork_child(&sigset
);
79 /* on error in the parent */
80 ust_after_fork_parent(&sigset
);
89 struct ustfork_clone_info
{
95 static int clone_fn(void *arg
)
97 struct ustfork_clone_info
*info
= (struct ustfork_clone_info
*) arg
;
99 /* clone is now done and we are in child */
100 ust_after_fork_child(&info
->sigset
);
101 return info
->fn(info
->arg
);
104 int clone(int (*fn
)(void *), void *child_stack
, int flags
, void *arg
, ...)
106 static int (*plibc_func
)(int (*fn
)(void *), void *child_stack
,
107 int flags
, void *arg
, pid_t
*ptid
,
108 struct user_desc
*tls
, pid_t
*ctid
) = NULL
;
111 struct user_desc
*tls
;
113 /* end of var args */
118 ptid
= va_arg(ap
, pid_t
*);
119 tls
= va_arg(ap
, struct user_desc
*);
120 ctid
= va_arg(ap
, pid_t
*);
123 if (plibc_func
== NULL
) {
124 plibc_func
= dlsym(RTLD_NEXT
, "clone");
125 if (plibc_func
== NULL
) {
126 fprintf(stderr
, "libustfork: unable to find \"clone\" symbol.\n");
131 if (flags
& CLONE_VM
) {
133 * Creating a thread, no need to intervene, just pass on
136 retval
= plibc_func(fn
, child_stack
, flags
, arg
, ptid
,
139 /* Creating a real process, we need to intervene. */
140 struct ustfork_clone_info info
= { .fn
= fn
, .arg
= arg
};
142 ust_before_fork(&info
.sigset
);
143 retval
= plibc_func(clone_fn
, child_stack
, flags
, &info
,
145 /* The child doesn't get here. */
146 ust_after_fork_parent(&info
.sigset
);
151 #elif defined (__FreeBSD__)
153 pid_t
rfork(int flags
)
155 static pid_t (*plibc_func
)(void) = NULL
;
159 if (plibc_func
== NULL
) {
160 plibc_func
= dlsym(RTLD_NEXT
, "rfork");
161 if (plibc_func
== NULL
) {
162 fprintf(stderr
, "libustfork: unable to find \"rfork\" symbol\n");
167 ust_before_fork(&sigset
);
168 /* Do the real rfork */
169 retval
= plibc_func();
172 ust_after_fork_child(&sigset
);
174 ust_after_fork_parent(&sigset
);
180 * On BSD, no need to override vfork, because it runs in the context of
181 * the parent, with parent waiting until execve or exit is executed in
186 #warning "Unknown OS. You might want to ensure that fork/clone/vfork/fork handling is complete."
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