diff options
Diffstat (limited to 'src/gammad.c')
| -rw-r--r-- | src/gammad.c | 298 |
1 files changed, 193 insertions, 105 deletions
diff --git a/src/gammad.c b/src/gammad.c index 6f83021..bdd3683 100644 --- a/src/gammad.c +++ b/src/gammad.c @@ -58,6 +58,44 @@ size_t outputs_n = 0; int socketfd = -1; /** + * The pathname of the PID file + */ +char* pidpath = NULL; + +/** + * The pathname of the socket + */ +char* socketpath = NULL; + +/** + * Error code returned by libgamma + */ +int gerror; + +/** + * Initialisation stage + * + * Used to keep track on what to destroy, of those things that + * must only be destroyed if they have been initialised + */ +int init_stage = 0; + +/** + * The libgamma site state + */ +libgamma_site_state_t site; + +/** + * The libgamma partition states + */ +libgamma_partition_state_t* partitions = NULL; + +/** + * The libgamma CRTC states + */ +libgamma_crtc_state_t* crtcs = NULL; + +/** * Has the process receive a signal * telling it to re-execute? */ @@ -100,11 +138,10 @@ static void sig_terminate(int signo) /** * Get the pathname of the runtime file * - * @param site The site * @param suffix The suffix for the file * @return The pathname of the file, `NULL` on error */ -static char* get_pathname(libgamma_site_state_t* site, const char* suffix) +static char* get_pathname(const char* suffix) { const char* rundir = getenv("XDG_RUNTIME_DIR"); const char* username = ""; @@ -115,13 +152,13 @@ static char* get_pathname(libgamma_site_state_t* site, const char* suffix) size_t n; int saved_errno; - if (site->site) + if (site.site) { - name = memdup(site->site, strlen(site->site) + 1); + name = memdup(site.site, strlen(site.site) + 1); if (name == NULL) goto fail; } - else if ((name = libgamma_method_default_site(site->method))) + else if ((name = libgamma_method_default_site(site.method))) { name = memdup(name, strlen(name) + 1); if (name == NULL) @@ -129,7 +166,7 @@ static char* get_pathname(libgamma_site_state_t* site, const char* suffix) } if (name != NULL) - switch (site->method) + switch (site.method) { case LIBGAMMA_METHOD_X_RANDR: case LIBGAMMA_METHOD_X_VIDMODE: @@ -151,7 +188,7 @@ static char* get_pathname(libgamma_site_state_t* site, const char* suffix) if (!(rc = malloc(n))) goto fail; sprintf(rc, "%s/.gammad/~%s/%i%s%s%s", - rundir, username, site->method, name ? "." : "", name ? name : "", suffix); + rundir, username, site.method, name ? "." : "", name ? name : "", suffix); return rc; fail: @@ -165,24 +202,22 @@ static char* get_pathname(libgamma_site_state_t* site, const char* suffix) /** * Get the pathname of the socket * - * @param site The site - * @return The pathname of the socket, `NULL` on error + * @return The pathname of the socket, `NULL` on error */ -static inline char* get_socket_pathname(libgamma_site_state_t* site) +static inline char* get_socket_pathname(void) { - return get_pathname(site, ".socket"); + return get_pathname(".socket"); } /** * Get the pathname of the PID file * - * @param site The site - * @return The pathname of the PID file, `NULL` on error + * @return The pathname of the PID file, `NULL` on error */ -static inline char* get_pidfile_pathname(libgamma_site_state_t* site) +static inline char* get_pidfile_pathname(void) { - return get_pathname(site, ".pid"); + return get_pathname(".pid"); } @@ -423,76 +458,39 @@ static int create_pidfile(char* pidfile) /** - * Print usage information and exit - */ -static void usage(void) -{ - printf("Usage: %s [-m method] [-s site] [-p]\n", argv0); - exit(1); -} - - -/** - * Must not be started without stdin, stdout, or stderr (may be /dev/null) - * - * The process closes stdout when the socket has been created + * Initialise the process * - * @return 0: Successful - * 1: An error occurred - * 2: Already running + * @param method The adjustment method, -1 for automatic + * @param sitename The site's name, may be `NULL` + * @param preserve Preserve current gamma ramps at priority 0 + * @param foreground Keep process in the foreground + * @param keep_stderr Keep stderr open + * @return 1: success + * 2: normal failure + * 3: libgamma failure + * 4: the service is already running + * Otherwise: the negative of the exit value the + * process should have and shall exit immediately */ -int main(int argc, char** argv) +static int initialise(int method, const char *sitename, int preserve, int foreground, int keep_stderr) { - int method = -1, gerror, rc = 1, preserve = 0, foreground = 0, r; - int keep_stderr = 0; - char* sitename = NULL; - libgamma_site_state_t site; - libgamma_partition_state_t* partitions = NULL; - libgamma_crtc_state_t* crtcs = NULL; + struct sockaddr_un address; + struct rlimit rlimit; size_t i, j, n, n0; - char* pidpath = NULL; - char* socketpath = NULL; sigset_t mask; - int init_stage = 0; + char* sitename_dup = NULL; + int r; + /* Zero out some memory so it can be destoried safely. */ memset(&site, 0, sizeof(site)); - ARGBEGIN - { - case 's': - sitename = EARGF(usage()); - break; - case 'm': - method = get_method(EARGF(usage())); - if (method < 0) - goto fail; - break; - case 'p': - preserve = 1; - break; - case 'f': - foreground = 1; - break; - case 'k': - keep_stderr = 1; - break; - default: - usage(); - } - ARGEND; - if (argc > 0) - usage(); - /* Close all file descriptors above stderr */ - { - struct rlimit rlimit; - if (getrlimit(RLIMIT_NOFILE, &rlimit) || (rlimit.rlim_cur == RLIM_INFINITY)) - n = 4 << 10; - else - n = (size_t)(rlimit.rlim_cur); - for (i = STDERR_FILENO + 1; i < n; i++) - close((int)i); - } + if (getrlimit(RLIMIT_NOFILE, &rlimit) || (rlimit.rlim_cur == RLIM_INFINITY)) + n = 4 << 10; + else + n = (size_t)(rlimit.rlim_cur); + for (i = STDERR_FILENO + 1; i < n; i++) + close((int)i); /* Set umask, reset signal handlers, and reset signal mask */ umask(0); @@ -505,23 +503,27 @@ int main(int argc, char** argv) /* Get method */ if ((method < 0) && (libgamma_list_methods(&method, 1, 0) < 1)) - return fprintf(stderr, "%s: no adjustment method available\n", argv0), 1; + return fprintf(stderr, "%s: no adjustment method available\n", argv0), -1; /* Get site */ - if ((gerror = libgamma_site_initialise(&site, method, sitename))) + if (sitename != NULL) + if (!(sitename_dup = memdup(sitename, strlen(sitename) + 1))) + goto fail; + if ((gerror = libgamma_site_initialise(&site, method, sitename_dup))) goto fail_libgamma; /* Get PID file and socket pathname */ - if (!(pidpath = get_pidfile_pathname(&site))) + if (!(pidpath = get_pidfile_pathname())) goto fail; - if (!(socketpath = get_socket_pathname(&site))) + if (!(socketpath = get_socket_pathname())) goto fail; /* Create PID file */ if ((r = create_pidfile(pidpath)) < 0) { free(pidpath), pidpath = NULL; - rc = -r; + if (r == -2) + goto already_running; goto fail; } @@ -658,25 +660,22 @@ int main(int argc, char** argv) } /* Create socket and start listening */ - { - struct sockaddr_un address; - address.sun_family = AF_UNIX; - if (strlen(socketpath) >= sizeof(address.sun_path)) - { - errno = ENAMETOOLONG; - goto fail; - } - strcpy(address.sun_path, socketpath); - unlink(socketpath); - if ((socketfd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) - goto fail; - if (fchmod(socketfd, S_IRWXU) < 0) - goto fail; - if (bind(socketfd, (struct sockaddr*)(&address), sizeof(address)) < 0) - goto fail; - if (listen(socketfd, SOMAXCONN) < 0) + address.sun_family = AF_UNIX; + if (strlen(socketpath) >= sizeof(address.sun_path)) + { + errno = ENAMETOOLONG; goto fail; - } + } + strcpy(address.sun_path, socketpath); + unlink(socketpath); + if ((socketfd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) + goto fail; + if (fchmod(socketfd, S_IRWXU) < 0) + goto fail; + if (bind(socketfd, (struct sockaddr*)(&address), sizeof(address)) < 0) + goto fail; + if (listen(socketfd, SOMAXCONN) < 0) + goto fail; /* Change directory to / to avoid blocking umounting */ if (chdir("/") < 0) @@ -763,7 +762,7 @@ int main(int argc, char** argv) if (got < 0) goto fail_background; close(notify_rw[0]); - return got == 0; + return -(got == 0); } goto done_background; @@ -785,9 +784,23 @@ int main(int argc, char** argv) perror(argv0); } - /* Done */ - rc = 0; - done: + return 1; + fail: + return 2; + fail_libgamma: + return 3; + already_running: + return 4; +} + + +/** + * Deinitialise the process + */ +static void destroy(void) +{ + size_t i; + if (init_stage >= 1) server_destroy(1); if (socketfd >= 0) @@ -832,9 +845,14 @@ int main(int argc, char** argv) default: break; /* impossible */ } - libgamma_crtc_destroy(outputs[i].crtc + i); + if (crtcs == NULL) + libgamma_crtc_destroy(outputs[i].crtc + i); output_destroy(outputs + i); } + free(outputs); + if (crtcs != NULL) + for (i = 0; i < outputs_n; i++) + libgamma_crtc_destroy(crtcs + i); free(crtcs); if (partitions != NULL) for (i = 0; i < site.partitions_available; i++) @@ -845,8 +863,78 @@ int main(int argc, char** argv) if (pidpath) unlink(pidpath); free(pidpath); +} + + +/** + * Print usage information and exit + */ +static void usage(void) +{ + printf("Usage: %s [-m method] [-s site] [-p]\n", argv0); + exit(1); +} + + +/** + * Must not be started without stdin, stdout, or stderr (may be /dev/null) + * + * The process closes stdout when the socket has been created + * + * @return 0: Successful + * 1: An error occurred + * 2: Already running + */ +int main(int argc, char** argv) +{ + int method = -1, rc = 1, preserve = 0, foreground = 0, keep_stderr = 0, r; + char* sitename = NULL; + + ARGBEGIN + { + case 's': + sitename = EARGF(usage()); + break; + case 'm': + method = get_method(EARGF(usage())); + if (method < 0) + goto fail; + break; + case 'p': + preserve = 1; + break; + case 'f': + foreground = 1; + break; + case 'k': + keep_stderr = 1; + break; + default: + usage(); + } + ARGEND; + if (argc > 0) + usage(); + + switch ((r = initialise(method, sitename, preserve, foreground, keep_stderr))) + { + case 1: + break; + case 2: + goto fail; + case 3: + goto fail_libgamma; + case 4: + rc = 2; + goto fail; + default: + return -r; + } + + rc = 0; + done: + destroy(); return rc; - /* Fail */ fail: if (errno != 0) perror(argv0); |