1 /**************************************************************************
3 * Copyright 2011 Jose Fonseca
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 **************************************************************************/
44 #else /* !defined(_WIN32) */
52 #include <sys/types.h>
58 static pid_t pid = -1;
62 * Wait for pager process on exit.
71 waitpid(pid, NULL, 0);
76 * Wait for page process on signal.
88 * Spawn a pager process and pipe standard output into it.
92 if (!isatty(STDOUT_FILENO)) {
101 int parentToChild[2];
105 ret = pipe(parentToChild);
116 ret = dup2(parentToChild[READ_FD], STDIN_FILENO);
118 ret = close(parentToChild[WRITE_FD]);
121 pager = getenv("PAGER");
126 setenv("LESS", "FRXn", 0);
128 execlp(pager, pager, NULL);
130 // This line should never be reached
135 ret = close(parentToChild[READ_FD]);
138 dup2(parentToChild[WRITE_FD], STDOUT_FILENO);
139 if (isatty(STDERR_FILENO))
140 dup2(parentToChild[WRITE_FD], STDERR_FILENO);
141 close(parentToChild[WRITE_FD]);
143 // Ensure we wait for the pager before terminating
144 signal(SIGINT, on_signal);
145 signal(SIGHUP, on_signal);
146 signal(SIGTERM, on_signal);
147 signal(SIGQUIT, on_signal);
148 signal(SIGPIPE, on_signal);
154 #endif /* !defined(_WIN32) */