diff options
| -rw-r--r-- | src/Makefile.am | 1 | ||||
| -rw-r--r-- | src/pipeutils.c | 98 | ||||
| -rw-r--r-- | src/pipeutils.h | 28 |
3 files changed, 127 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am index 73ead4b..99c8a2e 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -14,6 +14,7 @@ redshift_SOURCES = \ gamma-dummy.c gamma-dummy.h \ hooks.c hooks.h \ location-manual.c location-manual.h \ + pipeutils.c pipeutils.h \ redshift.c redshift.h \ signals.c signals.h \ solar.c solar.h \ diff --git a/src/pipeutils.c b/src/pipeutils.c new file mode 100644 index 0000000..75302cb --- /dev/null +++ b/src/pipeutils.c @@ -0,0 +1,98 @@ +/* pipeutils.c -- Utilities for using pipes as signals + This file is part of Redshift. + + Redshift is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Redshift is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Redshift. If not, see <http://www.gnu.org/licenses/>. + + Copyright (c) 2017 Jon Lund Steffensen <jonlst@gmail.com> +*/ + +#include <stdio.h> +#include <unistd.h> +#include <fcntl.h> + + +#ifndef _WIN32 + +/* Create non-blocking set of pipe fds. */ +int +pipeutils_create_nonblocking(int pipefds[2]) +{ + int r = pipe(pipefds); + if (r == -1) { + perror("pipe"); + return -1; + } + + int flags = fcntl(pipefds[0], F_GETFL); + if (flags == -1) { + perror("fcntl"); + close(pipefds[0]); + close(pipefds[1]); + return -1; + } + + r = fcntl(pipefds[0], F_SETFL, flags | O_NONBLOCK); + if (r == -1) { + perror("fcntl"); + close(pipefds[0]); + close(pipefds[1]); + return -1; + } + + flags = fcntl(pipefds[1], F_GETFL); + if (flags == -1) { + perror("fcntl"); + close(pipefds[0]); + close(pipefds[1]); + return -1; + } + + r = fcntl(pipefds[1], F_SETFL, flags | O_NONBLOCK); + if (r == -1) { + perror("fcntl"); + close(pipefds[0]); + close(pipefds[1]); + return -1; + } + + return 0; +} + +#else /* _WIN32 */ + +/* Create non-blocking set of pipe fds. + + Not supported on Windows! Always fails. */ +int +pipeutils_create_nonblocking(int pipefds[2]) +{ + return -1; +} + +#endif + +/* Signal on write-end of pipe. */ +void +pipeutils_signal(int write_fd) +{ + write(write_fd, "", 1); +} + +/* Mark signal as handled on read-end of pipe. */ +void +pipeutils_handle_signal(int read_fd) +{ + char data; + read(read_fd, &data, 1); +} diff --git a/src/pipeutils.h b/src/pipeutils.h new file mode 100644 index 0000000..69c3350 --- /dev/null +++ b/src/pipeutils.h @@ -0,0 +1,28 @@ +/* pipeutils.h -- Utilities for using pipes as signals + This file is part of Redshift. + + Redshift is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Redshift is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Redshift. If not, see <http://www.gnu.org/licenses/>. + + Copyright (c) 2017 Jon Lund Steffensen <jonlst@gmail.com> +*/ + +#ifndef REDSHIFT_PIPEUTILS_H +#define REDSHIFT_PIPEUTILS_H + +int pipeutils_create_nonblocking(int pipefds[2]); + +void pipeutils_signal(int write_fd); +void pipeutils_handle_signal(int read_fd); + +#endif /* ! REDSHIFT_PIPEUTILS_H */ |