1 | #include "owl.h" |
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2 | #ifdef HAVE_SYS_IOCTL_H |
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3 | #include <sys/ioctl.h> |
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4 | #endif |
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5 | #ifdef HAVE_SYS_FILIO_H |
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6 | #include <sys/filio.h> |
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7 | #endif |
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8 | #include <sys/wait.h> |
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9 | |
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10 | /* starts up popexec in a new viewwin */ |
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11 | owl_popexec *owl_popexec_new(const char *command) |
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12 | { |
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13 | owl_popexec *pe; |
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14 | owl_popwin *pw; |
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15 | owl_viewwin *v; |
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16 | int pipefds[2], child_write_fd, parent_read_fd; |
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17 | pid_t pid; |
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18 | GIOChannel *channel; |
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19 | |
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20 | if (owl_global_get_popwin(&g) || owl_global_get_viewwin(&g)) { |
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21 | owl_function_error("Popwin already in use."); |
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22 | return NULL; |
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23 | } |
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24 | |
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25 | pe = g_new(owl_popexec, 1); |
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26 | pe->winactive=0; |
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27 | pe->pid=0; |
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28 | pe->refcount=0; |
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29 | |
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30 | pw = owl_popwin_new(); |
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31 | owl_global_set_popwin(&g, pw); |
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32 | owl_popwin_up(pw); |
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33 | pe->vwin = v = owl_viewwin_new_text(owl_popwin_get_content(pw), ""); |
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34 | owl_global_set_viewwin(&g, v); |
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35 | owl_viewwin_set_onclose_hook(v, owl_popexec_viewwin_onclose, pe); |
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36 | |
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37 | owl_global_push_context(&g, OWL_CTX_POPLESS, v, "popless", NULL); |
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38 | pe->refcount++; |
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39 | |
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40 | if (0 != pipe(pipefds)) { |
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41 | owl_function_error("owl_function_popless_exec: pipe failed\n"); |
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42 | return NULL; |
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43 | } |
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44 | parent_read_fd = pipefds[0]; |
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45 | child_write_fd = pipefds[1]; |
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46 | pid = fork(); |
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47 | if (pid == -1) { |
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48 | close(pipefds[0]); |
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49 | close(pipefds[1]); |
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50 | owl_function_error("owl_function_popless_exec: fork failed\n"); |
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51 | return NULL; |
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52 | } else if (pid != 0) { |
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53 | close(child_write_fd); |
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54 | /* still in owl */ |
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55 | pe->pid=pid; |
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56 | pe->winactive=1; |
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57 | channel = g_io_channel_unix_new(parent_read_fd); |
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58 | g_io_channel_set_close_on_unref(channel, TRUE); |
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59 | pe->io_watch = g_io_add_watch_full(channel, G_PRIORITY_DEFAULT, |
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60 | G_IO_IN | G_IO_PRI | G_IO_ERR | G_IO_HUP, |
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61 | owl_popexec_inputhandler, pe, |
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62 | (GDestroyNotify)owl_popexec_unref); |
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63 | g_io_channel_unref(channel); |
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64 | pe->refcount++; |
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65 | } else { |
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66 | /* in the child process */ |
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67 | int i; |
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68 | int fdlimit = sysconf(_SC_OPEN_MAX); |
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69 | |
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70 | for (i=0; i<fdlimit; i++) { |
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71 | if (i!=child_write_fd) close(i); |
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72 | } |
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73 | dup2(child_write_fd, 1 /*stdout*/); |
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74 | dup2(child_write_fd, 2 /*stderr*/); |
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75 | close(child_write_fd); |
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76 | |
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77 | execl("/bin/sh", "sh", "-c", command, (const char *)NULL); |
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78 | _exit(127); |
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79 | } |
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80 | |
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81 | return pe; |
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82 | } |
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83 | |
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84 | gboolean owl_popexec_inputhandler(GIOChannel *source, GIOCondition condition, void *data) |
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85 | { |
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86 | owl_popexec *pe = data; |
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87 | int navail, bread, rv_navail; |
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88 | char *buf; |
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89 | int status; |
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90 | int fd = g_io_channel_unix_get_fd(source); |
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91 | |
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92 | /* TODO: Reading from GIOChannel may be more convenient. */ |
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93 | |
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94 | if (!pe) return FALSE; |
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95 | |
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96 | /* If pe->winactive is 0 then the vwin has closed. |
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97 | * If pe->pid is 0 then the child has already been reaped. |
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98 | * if d->fd is -1 then the fd has been closed out. |
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99 | * Under these cases we want to get to a state where: |
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100 | * - data read until end if child running |
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101 | * - child reaped |
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102 | * - fd closed |
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103 | * - callback removed |
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104 | */ |
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105 | |
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106 | /* the viewwin has closed */ |
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107 | if (!pe->pid && !pe->winactive) { |
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108 | pe->io_watch = 0; |
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109 | return FALSE; |
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110 | } |
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111 | |
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112 | if (0 != (rv_navail = ioctl(fd, FIONREAD, &navail))) { |
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113 | owl_function_debugmsg("ioctl error"); |
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114 | } |
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115 | |
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116 | /* check to see if the child has ended gracefully and no more data is |
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117 | * ready to be read... */ |
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118 | if (navail==0 && pe->pid>0 && waitpid(pe->pid, &status, WNOHANG) > 0) { |
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119 | owl_function_debugmsg("waitpid got child status: <%d>\n", status); |
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120 | pe->pid = 0; |
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121 | if (pe->winactive) { |
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122 | owl_viewwin_append_text(pe->vwin, "\n"); |
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123 | } |
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124 | pe->io_watch = 0; |
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125 | return FALSE; |
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126 | } |
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127 | |
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128 | if (fd<0 || !pe->pid || !pe->winactive || rv_navail) { |
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129 | owl_function_error("popexec should not have reached this point"); |
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130 | return FALSE; |
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131 | } |
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132 | |
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133 | if (navail<=0) return TRUE; |
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134 | if (navail>1024) { navail = 1024; } |
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135 | buf = g_new(char, navail+1); |
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136 | owl_function_debugmsg("about to read %d", navail); |
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137 | bread = read(fd, buf, navail); |
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138 | if (bread<0) { |
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139 | perror("read"); |
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140 | owl_function_debugmsg("read error"); |
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141 | } |
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142 | if (buf[navail-1] != '\0') { |
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143 | buf[navail] = '\0'; |
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144 | } |
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145 | owl_function_debugmsg("got data: <%s>", buf); |
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146 | if (pe->winactive) { |
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147 | owl_viewwin_append_text(pe->vwin, buf); |
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148 | } |
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149 | g_free(buf); |
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150 | return TRUE; |
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151 | } |
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152 | |
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153 | void owl_popexec_viewwin_onclose(owl_viewwin *vwin, void *data) |
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154 | { |
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155 | owl_popexec *pe = data; |
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156 | int status, rv; |
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157 | |
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158 | pe->winactive = 0; |
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159 | if (pe->io_watch) { |
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160 | g_source_remove(pe->io_watch); |
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161 | pe->io_watch = 0; |
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162 | } |
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163 | if (pe->pid) { |
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164 | /* TODO: we should handle the case where SIGTERM isn't good enough */ |
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165 | rv = kill(pe->pid, SIGTERM); |
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166 | owl_function_debugmsg("kill of pid %d returned %d", pe->pid, rv); |
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167 | rv = waitpid(pe->pid, &status, 0); |
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168 | owl_function_debugmsg("waidpid returned %d, status %d", rv, status); |
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169 | pe->pid = 0; |
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170 | } |
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171 | owl_function_debugmsg("unref of %p from onclose", pe); |
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172 | owl_popexec_unref(pe); |
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173 | } |
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174 | |
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175 | void owl_popexec_unref(owl_popexec *pe) |
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176 | { |
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177 | owl_function_debugmsg("unref of %p was %d", pe, pe->refcount); |
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178 | pe->refcount--; |
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179 | if (pe->refcount<=0) { |
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180 | owl_function_debugmsg("doing free of %p", pe); |
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181 | g_free(pe); |
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182 | } |
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183 | } |
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