[afbf668] | 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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[e19eb97] | 11 | owl_popexec *owl_popexec_new(const char *command) |
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[afbf668] | 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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[0e5afa2] | 17 | pid_t pid; |
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[afbf668] | 18 | |
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| 19 | pe = owl_malloc(sizeof(owl_popexec)); |
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| 20 | if (!pe) return NULL; |
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| 21 | pe->winactive=0; |
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| 22 | pe->pid=0; |
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| 23 | pe->refcount=0; |
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| 24 | |
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| 25 | pw=owl_global_get_popwin(&g); |
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| 26 | pe->vwin=v=owl_global_get_viewwin(&g); |
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| 27 | |
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| 28 | owl_popwin_up(pw); |
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| 29 | owl_viewwin_init_text(v, owl_popwin_get_curswin(pw), |
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| 30 | owl_popwin_get_lines(pw), owl_popwin_get_cols(pw), |
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| 31 | ""); |
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| 32 | owl_popwin_refresh(pw); |
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| 33 | owl_viewwin_redisplay(v, 0); |
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| 34 | owl_global_set_needrefresh(&g); |
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| 35 | owl_viewwin_set_onclose_hook(v, owl_popexec_viewwin_onclose, pe); |
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| 36 | pe->refcount++; |
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| 37 | |
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| 38 | if (0 != pipe(pipefds)) { |
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| 39 | owl_function_error("owl_function_popless_exec: pipe failed\n"); |
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| 40 | return NULL; |
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| 41 | } |
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| 42 | parent_read_fd = pipefds[0]; |
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| 43 | child_write_fd = pipefds[1]; |
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| 44 | pid = fork(); |
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| 45 | if (pid == -1) { |
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| 46 | close(pipefds[0]); |
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| 47 | close(pipefds[1]); |
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| 48 | owl_function_error("owl_function_popless_exec: fork failed\n"); |
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| 49 | return NULL; |
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| 50 | } else if (pid != 0) { |
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[40c6657] | 51 | close(child_write_fd); |
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[afbf668] | 52 | /* still in owl */ |
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| 53 | pe->pid=pid; |
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| 54 | pe->winactive=1; |
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[40c6657] | 55 | pe->dispatch.fd = parent_read_fd; |
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| 56 | pe->dispatch.cfunc = owl_popexec_inputhandler; |
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| 57 | pe->dispatch.destroy = owl_popexec_free_dispatch; |
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| 58 | pe->dispatch.data = pe; |
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| 59 | owl_select_add_dispatch(&pe->dispatch); |
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[afbf668] | 60 | pe->refcount++; |
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| 61 | } else { |
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| 62 | /* in the child process */ |
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| 63 | int i; |
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| 64 | int fdlimit = sysconf(_SC_OPEN_MAX); |
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| 65 | |
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| 66 | for (i=0; i<fdlimit; i++) { |
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| 67 | if (i!=child_write_fd) close(i); |
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| 68 | } |
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| 69 | dup2(child_write_fd, 1 /*stdout*/); |
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| 70 | dup2(child_write_fd, 2 /*stderr*/); |
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| 71 | close(child_write_fd); |
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| 72 | |
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[7565f8f] | 73 | execl("/bin/sh", "sh", "-c", command, (const char *)NULL); |
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[afbf668] | 74 | _exit(127); |
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| 75 | } |
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| 76 | |
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| 77 | return pe; |
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| 78 | } |
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| 79 | |
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[40c6657] | 80 | void owl_popexec_inputhandler(owl_dispatch *d) |
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[1971b59] | 81 | { |
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[40c6657] | 82 | owl_popexec *pe = d->data; |
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[afbf668] | 83 | int navail, bread, rv_navail; |
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| 84 | char *buf; |
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| 85 | int status; |
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| 86 | |
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| 87 | if (!pe) return; |
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| 88 | |
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| 89 | /* If pe->winactive is 0 then the vwin has closed. |
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| 90 | * If pe->pid is 0 then the child has already been reaped. |
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[40c6657] | 91 | * if d->fd is -1 then the fd has been closed out. |
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[afbf668] | 92 | * Under these cases we want to get to a state where: |
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| 93 | * - data read until end if child running |
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| 94 | * - child reaped |
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| 95 | * - fd closed |
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| 96 | * - callback removed |
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| 97 | */ |
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| 98 | |
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| 99 | /* the viewwin has closed */ |
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[40c6657] | 100 | if (!pe->pid && !pe->winactive) { |
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| 101 | owl_select_remove_dispatch(d->fd); |
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[afbf668] | 102 | return; |
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| 103 | } |
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| 104 | |
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[4d86e06] | 105 | if (0 != (rv_navail = ioctl(d->fd, FIONREAD, &navail))) { |
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[afbf668] | 106 | owl_function_debugmsg("ioctl error"); |
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| 107 | } |
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| 108 | |
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| 109 | /* check to see if the child has ended gracefully and no more data is |
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| 110 | * ready to be read... */ |
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| 111 | if (navail==0 && pe->pid>0 && waitpid(pe->pid, &status, WNOHANG) > 0) { |
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| 112 | owl_function_debugmsg("waitpid got child status: <%d>\n", status); |
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| 113 | pe->pid = 0; |
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| 114 | if (pe->winactive) { |
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| 115 | owl_viewwin_append_text(pe->vwin, "\n"); |
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| 116 | owl_viewwin_redisplay(pe->vwin, 1); |
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| 117 | } |
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[40c6657] | 118 | owl_select_remove_dispatch(d->fd); |
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[afbf668] | 119 | return; |
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| 120 | } |
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| 121 | |
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[40c6657] | 122 | if (d->fd<0 || !pe->pid || !pe->winactive || rv_navail) { |
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[afbf668] | 123 | owl_function_error("popexec should not have reached this point"); |
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| 124 | return; |
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| 125 | } |
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| 126 | |
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| 127 | if (navail<=0) return; |
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| 128 | if (navail>1024) { navail = 1024; } |
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| 129 | buf = owl_malloc(navail+1); |
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[40c6657] | 130 | owl_function_debugmsg("about to read %d", navail); |
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| 131 | bread = read(d->fd, buf, navail); |
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[afbf668] | 132 | if (bread<0) { |
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| 133 | perror("read"); |
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| 134 | owl_function_debugmsg("read error"); |
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| 135 | } |
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| 136 | if (buf[navail-1] != '\0') { |
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| 137 | buf[navail] = '\0'; |
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| 138 | } |
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[40c6657] | 139 | owl_function_debugmsg("got data: <%s>", buf); |
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[afbf668] | 140 | if (pe->winactive) { |
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| 141 | owl_viewwin_append_text(pe->vwin, buf); |
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| 142 | owl_viewwin_redisplay(pe->vwin, 1); |
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| 143 | } |
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| 144 | owl_free(buf); |
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| 145 | |
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| 146 | } |
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| 147 | |
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[40c6657] | 148 | void owl_popexec_free_dispatch(owl_dispatch *d) |
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| 149 | { |
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| 150 | owl_popexec *pe = d->data; |
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| 151 | close(d->fd); |
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| 152 | owl_popexec_unref(pe); |
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| 153 | } |
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| 154 | |
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[1971b59] | 155 | void owl_popexec_viewwin_onclose(owl_viewwin *vwin, void *data) |
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| 156 | { |
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[4d86e06] | 157 | owl_popexec *pe = data; |
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[afbf668] | 158 | int status, rv; |
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| 159 | |
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| 160 | pe->winactive = 0; |
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[40c6657] | 161 | if (pe->dispatch.fd>0) { |
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| 162 | owl_select_remove_dispatch(pe->dispatch.fd); |
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[afbf668] | 163 | } |
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| 164 | if (pe->pid) { |
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| 165 | /* TODO: we should handle the case where SIGTERM isn't good enough */ |
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| 166 | rv = kill(pe->pid, SIGTERM); |
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| 167 | owl_function_debugmsg("kill of pid %d returned %d", pe->pid, rv); |
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| 168 | rv = waitpid(pe->pid, &status, 0); |
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| 169 | owl_function_debugmsg("waidpid returned %d, status %d", rv, status); |
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| 170 | pe->pid = 0; |
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| 171 | } |
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[8721756] | 172 | owl_function_debugmsg("unref of %p from onclose", pe); |
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[afbf668] | 173 | owl_popexec_unref(pe); |
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| 174 | } |
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| 175 | |
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[1971b59] | 176 | void owl_popexec_unref(owl_popexec *pe) |
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| 177 | { |
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[8721756] | 178 | owl_function_debugmsg("unref of %p was %d", pe, pe->refcount); |
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[afbf668] | 179 | pe->refcount--; |
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| 180 | if (pe->refcount<=0) { |
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[8721756] | 181 | owl_function_debugmsg("doing free of %p", pe); |
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[afbf668] | 182 | owl_free(pe); |
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| 183 | } |
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| 184 | } |
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