1 #include "defs.h"
2
3 #include <sys/wait.h>
4
5 #ifndef __WNOTHREAD
6 # define __WNOTHREAD 0x20000000
7 #endif
8 #ifndef __WALL
9 # define __WALL 0x40000000
10 #endif
11 #ifndef __WCLONE
12 # define __WCLONE 0x80000000
13 #endif
14
15 #include "xlat/wait4_options.h"
16
17 #if !defined WCOREFLAG && defined WCOREFLG
18 # define WCOREFLAG WCOREFLG
19 #endif
20 #ifndef WCOREFLAG
21 # define WCOREFLAG 0x80
22 #endif
23 #ifndef WCOREDUMP
24 # define WCOREDUMP(status) ((status) & 0200)
25 #endif
26 #ifndef W_STOPCODE
27 # define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
28 #endif
29 #ifndef W_EXITCODE
30 # define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
31 #endif
32 #ifndef W_CONTINUED
33 # define W_CONTINUED 0xffff
34 #endif
35
36 #include "ptrace.h"
37 #include "xlat/ptrace_events.h"
38
39 static int
printstatus(int status)40 printstatus(int status)
41 {
42 int exited = 0;
43
44 /*
45 * Here is a tricky presentation problem. This solution
46 * is still not entirely satisfactory but since there
47 * are no wait status constructors it will have to do.
48 */
49 if (WIFSTOPPED(status)) {
50 int sig = WSTOPSIG(status);
51 tprintf("[{WIFSTOPPED(s) && WSTOPSIG(s) == %s%s}",
52 signame(sig & 0x7f),
53 sig & 0x80 ? " | 0x80" : "");
54 status &= ~W_STOPCODE(sig);
55 }
56 else if (WIFSIGNALED(status)) {
57 tprintf("[{WIFSIGNALED(s) && WTERMSIG(s) == %s%s}",
58 signame(WTERMSIG(status)),
59 WCOREDUMP(status) ? " && WCOREDUMP(s)" : "");
60 status &= ~(W_EXITCODE(0, WTERMSIG(status)) | WCOREFLAG);
61 }
62 else if (WIFEXITED(status)) {
63 tprintf("[{WIFEXITED(s) && WEXITSTATUS(s) == %d}",
64 WEXITSTATUS(status));
65 exited = 1;
66 status &= ~W_EXITCODE(WEXITSTATUS(status), 0);
67 }
68 #ifdef WIFCONTINUED
69 else if (WIFCONTINUED(status)) {
70 tprints("[{WIFCONTINUED(s)}");
71 status &= ~W_CONTINUED;
72 }
73 #endif
74 else {
75 tprintf("[%#x]", status);
76 return 0;
77 }
78
79 if (status) {
80 unsigned int event = (unsigned int) status >> 16;
81 if (event) {
82 tprints(" | ");
83 printxval(ptrace_events, event, "PTRACE_EVENT_???");
84 tprints(" << 16");
85 status &= 0xffff;
86 }
87 if (status)
88 tprintf(" | %#x", status);
89 }
90 tprints("]");
91
92 return exited;
93 }
94
95 static int
printwaitn(struct tcb * tcp,int n,int bitness)96 printwaitn(struct tcb *tcp, int n, int bitness)
97 {
98 int status;
99
100 if (entering(tcp)) {
101 /* On Linux, kernel-side pid_t is typedef'ed to int
102 * on all arches. Also, glibc-2.8 truncates wait3 and wait4
103 * pid argument to int on 64bit arches, producing,
104 * for example, wait4(4294967295, ...) instead of -1
105 * in strace. We have to use int here, not long.
106 */
107 int pid = tcp->u_arg[0];
108 tprintf("%d, ", pid);
109 } else {
110 /* status */
111 if (!tcp->u_arg[1])
112 tprints("NULL");
113 else if (syserror(tcp) || tcp->u_rval == 0)
114 tprintf("%#lx", tcp->u_arg[1]);
115 else if (umove(tcp, tcp->u_arg[1], &status) < 0)
116 tprints("[?]");
117 else
118 printstatus(status);
119 /* options */
120 tprints(", ");
121 printflags(wait4_options, tcp->u_arg[2], "W???");
122 if (n == 4) {
123 tprints(", ");
124 /* usage */
125 if (!tcp->u_arg[3])
126 tprints("NULL");
127 else if (tcp->u_rval > 0) {
128 #ifdef ALPHA
129 if (bitness)
130 printrusage32(tcp, tcp->u_arg[3]);
131 else
132 #endif
133 printrusage(tcp, tcp->u_arg[3]);
134 }
135 else
136 tprintf("%#lx", tcp->u_arg[3]);
137 }
138 }
139 return 0;
140 }
141
SYS_FUNC(waitpid)142 SYS_FUNC(waitpid)
143 {
144 return printwaitn(tcp, 3, 0);
145 }
146
SYS_FUNC(wait4)147 SYS_FUNC(wait4)
148 {
149 return printwaitn(tcp, 4, 0);
150 }
151
152 #ifdef ALPHA
SYS_FUNC(osf_wait4)153 SYS_FUNC(osf_wait4)
154 {
155 return printwaitn(tcp, 4, 1);
156 }
157 #endif
158
159 #include "xlat/waitid_types.h"
160
SYS_FUNC(waitid)161 SYS_FUNC(waitid)
162 {
163 if (entering(tcp)) {
164 printxval(waitid_types, tcp->u_arg[0], "P_???");
165 tprintf(", %ld, ", tcp->u_arg[1]);
166 }
167 else {
168 /* siginfo */
169 printsiginfo_at(tcp, tcp->u_arg[2]);
170 /* options */
171 tprints(", ");
172 printflags(wait4_options, tcp->u_arg[3], "W???");
173 if (tcp->s_ent->nargs > 4) {
174 /* usage */
175 tprints(", ");
176 if (!tcp->u_arg[4])
177 tprints("NULL");
178 else if (tcp->u_error)
179 tprintf("%#lx", tcp->u_arg[4]);
180 else
181 printrusage(tcp, tcp->u_arg[4]);
182 }
183 }
184 return 0;
185 }
186