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-rw-r--r--src/servers/kernel.c384
1 files changed, 0 insertions, 384 deletions
diff --git a/src/servers/kernel.c b/src/servers/kernel.c
deleted file mode 100644
index 1600d0a..0000000
--- a/src/servers/kernel.c
+++ /dev/null
@@ -1,384 +0,0 @@
-/**
- * coopgammad -- Cooperative gamma server
- * Copyright (C) 2016 Mattias Andrée (maandree@kth.se)
- *
- * This program 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.
- *
- * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
- */
-#include "kernel.h"
-#include "../state.h"
-#include "../util.h"
-
-#include <libgamma.h>
-
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/un.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <pwd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-
-
-/**
- * Get the pathname of the runtime file
- *
- * @param suffix The suffix for the file
- * @return The pathname of the file, `NULL` on error
- */
-GCC_ONLY(__attribute__((malloc, nonnull)))
-static char* get_pathname(const char* restrict suffix)
-{
- const char* restrict rundir = getenv("XDG_RUNTIME_DIR");
- const char* restrict username = "";
- char* name = NULL;
- char* p;
- char* restrict rc;
- struct passwd* restrict pw;
- size_t n;
- int saved_errno;
-
- if (sitename)
- {
- name = memdup(sitename, strlen(sitename) + 1);
- if (name == NULL)
- goto fail;
- }
- else if ((name = libgamma_method_default_site(method)))
- {
- name = memdup(name, strlen(name) + 1);
- if (name == NULL)
- goto fail;
- }
-
- if (name != NULL)
- switch (method)
- {
- case LIBGAMMA_METHOD_X_RANDR:
- case LIBGAMMA_METHOD_X_VIDMODE:
- if ((p = strrchr(name, ':')))
- if ((p = strchr(p, '.')))
- *p = '\0';
- break;
- default:
- break;
- }
-
- if (!rundir || !*rundir)
- rundir = "/tmp";
-
- if ((pw = getpwuid(getuid())))
- username = pw->pw_name ? pw->pw_name : "";
-
- n = sizeof("/.coopgammad/~/.") + 3 * sizeof(int);
- n += strlen(rundir) + strlen(username) + ((name != NULL) ? strlen(name) : 0) + strlen(suffix);
- if (!(rc = malloc(n)))
- goto fail;
- sprintf(rc, "%s/.coopgammad/~%s/%i%s%s%s",
- rundir, username, method, name ? "." : "", name ? name : "", suffix);
- free(name);
- return rc;
-
- fail:
- saved_errno = errno;
- free(name);
- errno = saved_errno;
- return NULL;
-}
-
-
-/**
- * Get the pathname of the socket
- *
- * @return The pathname of the socket, `NULL` on error
- */
-char* get_socket_pathname(void)
-{
- return get_pathname(".socket");
-}
-
-
-/**
- * Get the pathname of the PID file
- *
- * @return The pathname of the PID file, `NULL` on error
- */
-char* get_pidfile_pathname(void)
-{
- return get_pathname(".pid");
-}
-
-
-/**
- * Get the pathname of the state file
- *
- * @return The pathname of the state file, `NULL` on error
- */
-char* get_state_pathname(void)
-{
- return get_pathname(".state");
-}
-
-
-/**
- * Check whether a PID file is outdated
- *
- * @param pidpath The PID file
- * @param token An environment variable (including both key and value)
- * that must exist in the process if it is a coopgammad process
- * @return -1: An error occurred
- * 0: The service is already running
- * 1: The PID file is outdated
- */
-GCC_ONLY(__attribute__((nonnull)))
-static int is_pidfile_reusable(const char* restrict pidpath, const char* restrict token)
-{
- /* PORTERS: /proc/$PID/environ is Linux specific */
-
- char temp[sizeof("/proc//environ") + 3 * sizeof(long long int)];
- int fd = -1, saved_errno, tries = 0;
- char* content = NULL;
- char* p;
- pid_t pid = 0;
- size_t n;
-#if defined(HAVE_LINUX_PROCFS)
- char* end;
-#else
- (void) token;
-#endif
-
- /* Get PID */
- retry:
- fd = open(pidpath, O_RDONLY);
- if (fd < 0)
- return -1;
- content = nread(fd, &n);
- if (content == NULL)
- goto fail;
- close(fd), fd = -1;
-
- if (n == 0)
- {
- if (++tries > 1)
- goto bad;
- msleep(100); /* 1 tenth of a second */
- goto retry;
- }
-
- if (('0' > content[0]) || (content[0] > '9'))
- goto bad;
- if ((content[0] == '0') && ('0' <= content[1]) && (content[1] <= '9'))
- goto bad;
- for (p = content; *p; p++)
- if (('0' <= *p) && (*p <= '9'))
- pid = pid * 10 + (*p & 15);
- else
- break;
- if (*p++ != '\n')
- goto bad;
- if (*p)
- goto bad;
- if ((size_t)(p - content) != n)
- goto bad;
- sprintf(temp, "%llu\n", (unsigned long long)pid);
- if (strcmp(content, temp))
- goto bad;
- free(content);
-
- /* Validate PID */
-#if defined(HAVE_LINUX_PROCFS)
- sprintf(temp, "/proc/%llu/environ", (unsigned long long)pid);
- fd = open(temp, O_RDONLY);
- if (fd < 0)
- return ((errno == ENOENT) || (errno == EACCES)) ? 1 : -1;
- content = nread(fd, &n);
- if (content == NULL)
- goto fail;
- close(fd), fd = -1;
-
- for (end = (p = content) + n; p != end; p = strchr(p, '\0') + 1)
- if (!strcmp(p, token))
- return free(content), 0;
- free(content);
-#else
- if ((kill(pid, 0) == 0) || (errno == EINVAL))
- return 0;
-#endif
-
- return 1;
- bad:
- fprintf(stderr, "%s: pid file contains invalid content: %s\n", argv0, pidpath);
- errno = 0;
- return -1;
- fail:
- saved_errno = errno;
- free(content);
- if (fd >= 0)
- close(fd);
- errno = saved_errno;
- return -1;
-}
-
-
-/**
- * Create PID file
- *
- * @param pidpath The pathname of the PID file
- * @return Zero on success, -1 on error,
- * -2 if the service is already running
- */
-int create_pidfile(char* pidpath)
-{
- int fd = -1, r, saved_errno;
- char* p;
- char* restrict token = NULL;
-
- /* Create token used to validate the service. */
- token = malloc(sizeof("COOPGAMMAD_PIDFILE_TOKEN=") + strlen(pidpath));
- if (token == NULL)
- return -1;
- sprintf(token, "COOPGAMMAD_PIDFILE_TOKEN=%s", pidpath);
-#if !defined(USE_VALGRIND)
- if (putenv(token))
- goto putenv_fail;
- /* `token` must not be free! */
-#else
- {
- static char static_token[sizeof("COOPGAMMAD_PIDFILE_TOKEN=") + PATH_MAX];
- if (strlen(pidpath) > PATH_MAX)
- abort();
- strcpy(static_token, token);
- if (putenv(static_token))
- goto fail;
- }
-#endif
-
- /* Create PID file's directory. */
- for (p = pidpath; *p == '/'; p++);
- while ((p = strchr(p, '/')))
- {
- *p = '\0';
- if (mkdir(pidpath, 0755) < 0)
- if (errno != EEXIST)
- {
- *p = '/';
- goto fail;
- }
- *p++ = '/';
- }
-
- /* Create PID file. */
- retry:
- fd = open(pidpath, O_CREAT | O_EXCL | O_WRONLY, 0644);
- if (fd < 0)
- {
- if (errno == EINTR)
- goto retry;
- if (errno != EEXIST)
- return -1;
- r = is_pidfile_reusable(pidpath, token);
- if (r > 0)
- {
- unlink(pidpath);
- goto retry;
- }
- else if (r < 0)
- goto fail;
- fprintf(stderr, "%s: service is already running\n", argv0);
- errno = 0;
- return -2;
- }
-
- /* Write PID to PID file. */
- if (dprintf(fd, "%llu\n", (unsigned long long)getpid()) < 0)
- goto fail;
-
- /* Done */
-#if defined(USE_VALGRIND)
- free(token);
-#endif
- if (close(fd) < 0)
- if (errno != EINTR)
- return -1;
- return 0;
-#if !defined(USE_VALGRIND)
- putenv_fail:
- saved_errno = errno;
- free(token);
- errno = saved_errno;
-#endif
- fail:
- saved_errno = errno;
-#if defined(USE_VALGRIND)
- free(token);
-#endif
- if (fd >= 0)
- {
- close(fd);
- unlink(pidpath);
- }
- errno = saved_errno;
- return -1;
-}
-
-
-/**
- * Create socket and start listening
- *
- * @param socketpath The pathname of the socket
- * @return Zero on success, -1 on error
- */
-int create_socket(const char* socketpath)
-{
- struct sockaddr_un address;
-
- address.sun_family = AF_UNIX;
- if (strlen(socketpath) >= sizeof(address.sun_path))
- {
- errno = ENAMETOOLONG;
- return -1;
- }
- strcpy(address.sun_path, socketpath);
- unlink(socketpath);
- if ((socketfd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
- return -1;
- if (fchmod(socketfd, S_IRWXU) < 0)
- return -1;
- if (bind(socketfd, (struct sockaddr*)(&address), (socklen_t)sizeof(address)) < 0)
- return -1;
- if (listen(socketfd, SOMAXCONN) < 0)
- return -1;
-
- return 0;
-}
-
-
-/**
- * Close and unlink the socket
- *
- * @param socketpath The pathname of the socket
- */
-void close_socket(const char* socketpath)
-{
- if (socketfd >= 0)
- {
- shutdown(socketfd, SHUT_RDWR);
- close(socketfd);
- unlink(socketpath);
- }
-}
-
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