[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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[9eb38bb] | 19 | if (owl_global_get_popwin(&g) || owl_global_get_viewwin(&g)) { |
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[03ca005] | 20 | owl_function_error("Popwin already in use."); |
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| 21 | return NULL; |
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| 22 | } |
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| 23 | |
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[afbf668] | 24 | pe = owl_malloc(sizeof(owl_popexec)); |
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| 25 | if (!pe) return NULL; |
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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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[03ca005] | 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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[9eb38bb] | 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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[afbf668] | 36 | |
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[07b59ea] | 37 | owl_global_push_context(&g, OWL_CTX_POPLESS, v, "popless", NULL); |
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[afbf668] | 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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[40c6657] | 53 | close(child_write_fd); |
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[afbf668] | 54 | /* still in owl */ |
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| 55 | pe->pid=pid; |
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| 56 | pe->winactive=1; |
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[18fdd5f9] | 57 | pe->dispatch = owl_select_add_io_dispatch(parent_read_fd, OWL_IO_READ|OWL_IO_EXCEPT, &owl_popexec_inputhandler, &owl_popexec_delete_dispatch, pe); |
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[afbf668] | 58 | pe->refcount++; |
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| 59 | } else { |
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| 60 | /* in the child process */ |
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| 61 | int i; |
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| 62 | int fdlimit = sysconf(_SC_OPEN_MAX); |
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| 63 | |
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| 64 | for (i=0; i<fdlimit; i++) { |
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| 65 | if (i!=child_write_fd) close(i); |
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| 66 | } |
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| 67 | dup2(child_write_fd, 1 /*stdout*/); |
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| 68 | dup2(child_write_fd, 2 /*stderr*/); |
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| 69 | close(child_write_fd); |
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| 70 | |
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[7565f8f] | 71 | execl("/bin/sh", "sh", "-c", command, (const char *)NULL); |
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[afbf668] | 72 | _exit(127); |
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| 73 | } |
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| 74 | |
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| 75 | return pe; |
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| 76 | } |
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| 77 | |
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[18fdd5f9] | 78 | void owl_popexec_inputhandler(const owl_io_dispatch *d, void *data) |
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[1971b59] | 79 | { |
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[18fdd5f9] | 80 | owl_popexec *pe = data; |
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[afbf668] | 81 | int navail, bread, rv_navail; |
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| 82 | char *buf; |
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| 83 | int status; |
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| 84 | |
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| 85 | if (!pe) return; |
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| 86 | |
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| 87 | /* If pe->winactive is 0 then the vwin has closed. |
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| 88 | * If pe->pid is 0 then the child has already been reaped. |
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[40c6657] | 89 | * if d->fd is -1 then the fd has been closed out. |
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[afbf668] | 90 | * Under these cases we want to get to a state where: |
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| 91 | * - data read until end if child running |
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| 92 | * - child reaped |
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| 93 | * - fd closed |
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| 94 | * - callback removed |
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| 95 | */ |
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| 96 | |
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| 97 | /* the viewwin has closed */ |
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[40c6657] | 98 | if (!pe->pid && !pe->winactive) { |
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[18fdd5f9] | 99 | owl_select_remove_io_dispatch(d); |
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[125fd21] | 100 | pe->dispatch = NULL; |
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[afbf668] | 101 | return; |
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| 102 | } |
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| 103 | |
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[4d86e06] | 104 | if (0 != (rv_navail = ioctl(d->fd, FIONREAD, &navail))) { |
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[afbf668] | 105 | owl_function_debugmsg("ioctl error"); |
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| 106 | } |
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| 107 | |
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| 108 | /* check to see if the child has ended gracefully and no more data is |
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| 109 | * ready to be read... */ |
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| 110 | if (navail==0 && pe->pid>0 && waitpid(pe->pid, &status, WNOHANG) > 0) { |
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| 111 | owl_function_debugmsg("waitpid got child status: <%d>\n", status); |
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| 112 | pe->pid = 0; |
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| 113 | if (pe->winactive) { |
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| 114 | owl_viewwin_append_text(pe->vwin, "\n"); |
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| 115 | } |
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[18fdd5f9] | 116 | owl_select_remove_io_dispatch(d); |
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[125fd21] | 117 | pe->dispatch = NULL; |
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[afbf668] | 118 | return; |
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| 119 | } |
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| 120 | |
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[40c6657] | 121 | if (d->fd<0 || !pe->pid || !pe->winactive || rv_navail) { |
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[afbf668] | 122 | owl_function_error("popexec should not have reached this point"); |
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| 123 | return; |
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| 124 | } |
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| 125 | |
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| 126 | if (navail<=0) return; |
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| 127 | if (navail>1024) { navail = 1024; } |
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| 128 | buf = owl_malloc(navail+1); |
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[40c6657] | 129 | owl_function_debugmsg("about to read %d", navail); |
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| 130 | bread = read(d->fd, buf, navail); |
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[afbf668] | 131 | if (bread<0) { |
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| 132 | perror("read"); |
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| 133 | owl_function_debugmsg("read error"); |
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| 134 | } |
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| 135 | if (buf[navail-1] != '\0') { |
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| 136 | buf[navail] = '\0'; |
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| 137 | } |
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[40c6657] | 138 | owl_function_debugmsg("got data: <%s>", buf); |
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[afbf668] | 139 | if (pe->winactive) { |
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| 140 | owl_viewwin_append_text(pe->vwin, buf); |
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| 141 | } |
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| 142 | owl_free(buf); |
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| 143 | |
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| 144 | } |
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| 145 | |
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[18fdd5f9] | 146 | void owl_popexec_delete_dispatch(const owl_io_dispatch *d) |
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[40c6657] | 147 | { |
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| 148 | owl_popexec *pe = d->data; |
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| 149 | close(d->fd); |
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| 150 | owl_popexec_unref(pe); |
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| 151 | } |
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| 152 | |
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[1971b59] | 153 | void owl_popexec_viewwin_onclose(owl_viewwin *vwin, void *data) |
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| 154 | { |
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[4d86e06] | 155 | owl_popexec *pe = data; |
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[afbf668] | 156 | int status, rv; |
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| 157 | |
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| 158 | pe->winactive = 0; |
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[125fd21] | 159 | if (pe->dispatch) { |
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[18fdd5f9] | 160 | owl_select_remove_io_dispatch(pe->dispatch); |
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[125fd21] | 161 | pe->dispatch = NULL; |
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[afbf668] | 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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[8721756] | 171 | owl_function_debugmsg("unref of %p from onclose", pe); |
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[afbf668] | 172 | owl_popexec_unref(pe); |
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| 173 | } |
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| 174 | |
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[1971b59] | 175 | void owl_popexec_unref(owl_popexec *pe) |
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| 176 | { |
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[8721756] | 177 | owl_function_debugmsg("unref of %p was %d", pe, pe->refcount); |
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[afbf668] | 178 | pe->refcount--; |
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| 179 | if (pe->refcount<=0) { |
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[8721756] | 180 | owl_function_debugmsg("doing free of %p", pe); |
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[afbf668] | 181 | owl_free(pe); |
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| 182 | } |
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| 183 | } |
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