Dmitry V. Levin | 7ccc144 | 2014-12-11 19:25:02 +0000 | [diff] [blame] | 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 | |
| 33 | static int |
| 34 | printstatus(int status) |
| 35 | { |
| 36 | int exited = 0; |
| 37 | |
| 38 | /* |
| 39 | * Here is a tricky presentation problem. This solution |
| 40 | * is still not entirely satisfactory but since there |
| 41 | * are no wait status constructors it will have to do. |
| 42 | */ |
| 43 | if (WIFSTOPPED(status)) { |
| 44 | tprintf("[{WIFSTOPPED(s) && WSTOPSIG(s) == %s}", |
| 45 | signame(WSTOPSIG(status))); |
| 46 | status &= ~W_STOPCODE(WSTOPSIG(status)); |
| 47 | } |
| 48 | else if (WIFSIGNALED(status)) { |
| 49 | tprintf("[{WIFSIGNALED(s) && WTERMSIG(s) == %s%s}", |
| 50 | signame(WTERMSIG(status)), |
| 51 | WCOREDUMP(status) ? " && WCOREDUMP(s)" : ""); |
| 52 | status &= ~(W_EXITCODE(0, WTERMSIG(status)) | WCOREFLAG); |
| 53 | } |
| 54 | else if (WIFEXITED(status)) { |
| 55 | tprintf("[{WIFEXITED(s) && WEXITSTATUS(s) == %d}", |
| 56 | WEXITSTATUS(status)); |
| 57 | exited = 1; |
| 58 | status &= ~W_EXITCODE(WEXITSTATUS(status), 0); |
| 59 | } |
| 60 | else { |
| 61 | tprintf("[%#x]", status); |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | if (status == 0) |
| 66 | tprints("]"); |
| 67 | else |
| 68 | tprintf(" | %#x]", status); |
| 69 | |
| 70 | return exited; |
| 71 | } |
| 72 | |
| 73 | static int |
| 74 | printwaitn(struct tcb *tcp, int n, int bitness) |
| 75 | { |
| 76 | int status; |
| 77 | |
| 78 | if (entering(tcp)) { |
| 79 | /* On Linux, kernel-side pid_t is typedef'ed to int |
| 80 | * on all arches. Also, glibc-2.8 truncates wait3 and wait4 |
| 81 | * pid argument to int on 64bit arches, producing, |
| 82 | * for example, wait4(4294967295, ...) instead of -1 |
| 83 | * in strace. We have to use int here, not long. |
| 84 | */ |
| 85 | int pid = tcp->u_arg[0]; |
| 86 | tprintf("%d, ", pid); |
| 87 | } else { |
| 88 | /* status */ |
| 89 | if (!tcp->u_arg[1]) |
| 90 | tprints("NULL"); |
| 91 | else if (syserror(tcp) || tcp->u_rval == 0) |
| 92 | tprintf("%#lx", tcp->u_arg[1]); |
| 93 | else if (umove(tcp, tcp->u_arg[1], &status) < 0) |
| 94 | tprints("[?]"); |
| 95 | else |
| 96 | printstatus(status); |
| 97 | /* options */ |
| 98 | tprints(", "); |
| 99 | printflags(wait4_options, tcp->u_arg[2], "W???"); |
| 100 | if (n == 4) { |
| 101 | tprints(", "); |
| 102 | /* usage */ |
| 103 | if (!tcp->u_arg[3]) |
| 104 | tprints("NULL"); |
| 105 | else if (tcp->u_rval > 0) { |
| 106 | #ifdef ALPHA |
| 107 | if (bitness) |
| 108 | printrusage32(tcp, tcp->u_arg[3]); |
| 109 | else |
| 110 | #endif |
| 111 | printrusage(tcp, tcp->u_arg[3]); |
| 112 | } |
| 113 | else |
| 114 | tprintf("%#lx", tcp->u_arg[3]); |
| 115 | } |
| 116 | } |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | int |
| 121 | sys_waitpid(struct tcb *tcp) |
| 122 | { |
| 123 | return printwaitn(tcp, 3, 0); |
| 124 | } |
| 125 | |
| 126 | int |
| 127 | sys_wait4(struct tcb *tcp) |
| 128 | { |
| 129 | return printwaitn(tcp, 4, 0); |
| 130 | } |
| 131 | |
| 132 | #ifdef ALPHA |
| 133 | int |
| 134 | sys_osf_wait4(struct tcb *tcp) |
| 135 | { |
| 136 | return printwaitn(tcp, 4, 1); |
| 137 | } |
| 138 | #endif |
| 139 | |
| 140 | #include "xlat/waitid_types.h" |
| 141 | |
| 142 | int |
| 143 | sys_waitid(struct tcb *tcp) |
| 144 | { |
| 145 | if (entering(tcp)) { |
| 146 | printxval(waitid_types, tcp->u_arg[0], "P_???"); |
| 147 | tprintf(", %ld, ", tcp->u_arg[1]); |
| 148 | } |
| 149 | else { |
| 150 | /* siginfo */ |
| 151 | printsiginfo_at(tcp, tcp->u_arg[2]); |
| 152 | /* options */ |
| 153 | tprints(", "); |
| 154 | printflags(wait4_options, tcp->u_arg[3], "W???"); |
| 155 | if (tcp->s_ent->nargs > 4) { |
| 156 | /* usage */ |
| 157 | tprints(", "); |
| 158 | if (!tcp->u_arg[4]) |
| 159 | tprints("NULL"); |
| 160 | else if (tcp->u_error) |
| 161 | tprintf("%#lx", tcp->u_arg[4]); |
| 162 | else |
| 163 | printrusage(tcp, tcp->u_arg[4]); |
| 164 | } |
| 165 | } |
| 166 | return 0; |
| 167 | } |