[d564c3d] | 1 | #include <signal.h> |
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| 2 | #include <unistd.h> |
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| 3 | #include <sys/select.h> |
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| 4 | #include <sys/types.h> |
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| 5 | #include <sys/wait.h> |
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| 6 | #include <poll.h> |
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| 7 | #include <fcntl.h> |
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| 8 | #include <string.h> |
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| 9 | |
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| 10 | #include <glib.h> |
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| 11 | |
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| 12 | int send_receive(int rfd, int wfd, const char *out, char **in) |
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| 13 | { |
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| 14 | GString *str = g_string_new(""); |
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| 15 | char buf[1024]; |
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| 16 | nfds_t nfds; |
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| 17 | int err = 0; |
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| 18 | struct pollfd fds[2]; |
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| 19 | |
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| 20 | fcntl(rfd, F_SETFL, O_NONBLOCK | fcntl(rfd, F_GETFL)); |
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| 21 | fcntl(wfd, F_SETFL, O_NONBLOCK | fcntl(wfd, F_GETFL)); |
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| 22 | |
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| 23 | fds[0].fd = rfd; |
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| 24 | fds[0].events = POLLIN; |
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| 25 | fds[1].fd = wfd; |
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| 26 | fds[1].events = POLLOUT; |
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| 27 | |
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| 28 | while(1) { |
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| 29 | if(out && *out) { |
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| 30 | nfds = 2; |
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| 31 | } else { |
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| 32 | nfds = 1; |
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| 33 | } |
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| 34 | err = poll(fds, nfds, -1); |
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| 35 | if(err < 0) { |
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| 36 | break; |
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| 37 | } |
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| 38 | if(out && *out) { |
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| 39 | if(fds[1].revents & POLLOUT) { |
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| 40 | err = write(wfd, out, strlen(out)); |
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| 41 | if(err > 0) { |
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| 42 | out += err; |
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| 43 | } |
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| 44 | if(err < 0) { |
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| 45 | out = NULL; |
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| 46 | } |
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| 47 | } |
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| 48 | if(!out || !*out || fds[1].revents & (POLLERR | POLLHUP)) { |
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| 49 | close(wfd); |
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| 50 | out = NULL; |
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| 51 | } |
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| 52 | } |
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| 53 | if(fds[0].revents & POLLIN) { |
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| 54 | err = read(rfd, buf, sizeof(buf)); |
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| 55 | if(err <= 0) { |
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| 56 | break; |
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| 57 | } |
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| 58 | g_string_append_len(str, buf, err); |
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| 59 | } else if(fds[0].revents & (POLLHUP | POLLERR)) { |
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| 60 | err = 0; |
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| 61 | break; |
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| 62 | } |
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| 63 | } |
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| 64 | |
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| 65 | *in = g_string_free(str, err < 0); |
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| 66 | return err; |
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| 67 | } |
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| 68 | |
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| 69 | int call_filter(const char *prog, const char *const *argv, const char *in, char **out, int *status) |
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| 70 | { |
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| 71 | int err = 0; |
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| 72 | pid_t pid; |
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| 73 | int rfd[2]; |
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| 74 | int wfd[2]; |
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| 75 | |
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| 76 | if((err = pipe(rfd))) goto out; |
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| 77 | if((err = pipe(wfd))) goto out_close_rfd; |
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| 78 | |
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| 79 | pid = fork(); |
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| 80 | if(pid < 0) { |
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| 81 | err = pid; |
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| 82 | goto out_close_all; |
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| 83 | } |
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| 84 | if(pid) { |
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| 85 | /* parent */ |
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| 86 | close(rfd[1]); |
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| 87 | close(wfd[0]); |
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| 88 | err = send_receive(rfd[0], wfd[1], in, out); |
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| 89 | if(err == 0) { |
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| 90 | waitpid(pid, status, 0); |
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| 91 | } |
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| 92 | } else { |
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| 93 | /* child */ |
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| 94 | close(rfd[0]); |
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| 95 | close(wfd[1]); |
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| 96 | dup2(rfd[1], 1); |
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| 97 | dup2(wfd[0], 0); |
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| 98 | close(rfd[1]); |
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| 99 | close(wfd[0]); |
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| 100 | |
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| 101 | if(execvp(prog, (char *const *)argv)) { |
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| 102 | _exit(-1); |
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| 103 | } |
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| 104 | } |
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| 105 | |
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| 106 | out_close_all: |
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| 107 | close(wfd[0]); |
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| 108 | close(wfd[1]); |
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| 109 | out_close_rfd: |
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| 110 | close(rfd[0]); |
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| 111 | close(rfd[1]); |
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| 112 | out: |
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| 113 | return err; |
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| 114 | } |
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