scoutos / prex-0.9.0 / include / sys / wait.h @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 1982, 1986, 1989, 1993, 1994
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3 | * The Regents of the University of California. All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the University nor the names of its contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | *
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29 | * @(#)wait.h 8.2 (Berkeley) 7/10/94
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30 | */
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31 | |||
32 | #ifndef _SYS_WAIT_H_
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33 | #define _SYS_WAIT_H_
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34 | |||
35 | /*
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36 | * This file holds definitions relevent to the wait4 system call
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37 | * and the alternate interfaces that use it (wait, wait3, waitpid).
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38 | */
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39 | |||
40 | /*
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41 | * Macros to test the exit status returned by wait
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42 | * and extract the relevant values.
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43 | */
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44 | #ifdef _POSIX_SOURCE
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45 | #define _W_INT(i) (i)
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46 | #else
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47 | #define _W_INT(w) (*(int *)&(w)) /* convert union wait to int */ |
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48 | #define WCOREFLAG 0200 |
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49 | #endif
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50 | |||
51 | #define _WSTATUS(x) (_W_INT(x) & 0177) |
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52 | #define _WSTOPPED 0177 /* _WSTATUS if process is stopped */ |
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53 | #define WIFSTOPPED(x) (_WSTATUS(x) == _WSTOPPED)
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54 | #define WSTOPSIG(x) (_W_INT(x) >> 8) |
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55 | #define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0) |
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56 | #define WTERMSIG(x) (_WSTATUS(x))
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57 | #define WIFEXITED(x) (_WSTATUS(x) == 0) |
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58 | #define WEXITSTATUS(x) (_W_INT(x) >> 8) |
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59 | #ifndef _POSIX_SOURCE
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60 | #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
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61 | |||
62 | #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig)) |
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63 | #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED) |
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64 | #endif
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65 | |||
66 | /*
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67 | * Option bits for the third argument of wait4. WNOHANG causes the
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68 | * wait to not hang if there are no stopped or terminated processes, rather
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69 | * returning an error indication in this case (pid==0). WUNTRACED
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70 | * indicates that the caller should receive status about untraced children
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71 | * which stop due to signals. If children are stopped and a wait without
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72 | * this option is done, it is as though they were still running... nothing
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73 | * about them is returned.
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74 | */
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75 | #define WNOHANG 1 /* don't hang in wait */ |
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76 | #define WUNTRACED 2 /* tell about stopped, untraced children */ |
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77 | |||
78 | #ifndef _POSIX_SOURCE
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79 | /* POSIX extensions and 4.2/4.3 compatability: */
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80 | |||
81 | /*
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82 | * Tokens for special values of the "pid" parameter to wait4.
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83 | */
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84 | #define WAIT_ANY (-1) /* any process */ |
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85 | #define WAIT_MYPGRP 0 /* any process in my process group */ |
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86 | |||
87 | #include <sys/endian.h> |
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88 | |||
89 | /*
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90 | * Deprecated:
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91 | * Structure of the information in the status word returned by wait4.
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92 | * If w_stopval==WSTOPPED, then the second structure describes
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93 | * the information returned, else the first.
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94 | */
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95 | union wait {
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96 | int w_status; /* used in syscall */ |
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97 | /*
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98 | * Terminated process status.
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99 | */
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100 | struct {
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101 | #if BYTE_ORDER == LITTLE_ENDIAN
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102 | unsigned int w_Termsig:7, /* termination signal */ |
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103 | w_Coredump:1, /* core dump indicator */ |
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104 | w_Retcode:8, /* exit code if w_termsig==0 */ |
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105 | w_Filler:16; /* upper bits filler */ |
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106 | #endif
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107 | #if BYTE_ORDER == BIG_ENDIAN
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108 | unsigned int w_Filler:16, /* upper bits filler */ |
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109 | w_Retcode:8, /* exit code if w_termsig==0 */ |
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110 | w_Coredump:1, /* core dump indicator */ |
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111 | w_Termsig:7; /* termination signal */ |
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112 | #endif
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113 | } w_T; |
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114 | /*
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115 | * Stopped process status. Returned
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116 | * only for traced children unless requested
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117 | * with the WUNTRACED option bit.
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118 | */
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119 | struct {
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120 | #if BYTE_ORDER == LITTLE_ENDIAN
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121 | unsigned int w_Stopval:8, /* == W_STOPPED if stopped */ |
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122 | w_Stopsig:8, /* signal that stopped us */ |
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123 | w_Filler:16; /* upper bits filler */ |
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124 | #endif
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125 | #if BYTE_ORDER == BIG_ENDIAN
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126 | unsigned int w_Filler:16, /* upper bits filler */ |
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127 | w_Stopsig:8, /* signal that stopped us */ |
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128 | w_Stopval:8; /* == W_STOPPED if stopped */ |
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129 | #endif
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130 | } w_S; |
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131 | }; |
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132 | #define w_termsig w_T.w_Termsig
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133 | #define w_coredump w_T.w_Coredump
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134 | #define w_retcode w_T.w_Retcode
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135 | #define w_stopval w_S.w_Stopval
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136 | #define w_stopsig w_S.w_Stopsig
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137 | |||
138 | #define WSTOPPED _WSTOPPED
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139 | #endif /* _POSIX_SOURCE */ |
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140 | |||
141 | #ifndef KERNEL
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142 | #include <sys/types.h> |
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143 | #include <sys/cdefs.h> |
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144 | |||
145 | __BEGIN_DECLS |
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146 | pid_t wait(int *);
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147 | pid_t waitpid(pid_t, int *, int); |
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148 | __END_DECLS |
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149 | #endif
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150 | |||
151 | #endif /* !_SYS_WAIT_H_ */ |