X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=ust-consumerd%2Fust-consumerd.c;fp=ust-consumerd%2Fust-consumerd.c;h=fae4efafa87f06e02c80ef09080a0b2e8afabaf0;hb=9dc7b7ff797a5cbb1e9ffd59e053a04562f306c4;hp=0000000000000000000000000000000000000000;hpb=28c1bb4003ca120888a1d61d5ec71eac426ae490;p=ust.git

diff --git a/ust-consumerd/ust-consumerd.c b/ust-consumerd/ust-consumerd.c
new file mode 100644
index 0000000..fae4efa
--- /dev/null
+++ b/ust-consumerd/ust-consumerd.c
@@ -0,0 +1,505 @@
+/* Copyright (C) 2009  Pierre-Marc Fournier
+ *               2010  Alexis Halle
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#define _GNU_SOURCE
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/shm.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <getopt.h>
+
+#include "ust/ustconsumer.h"
+#include "usterr.h"
+
+char *sock_path=NULL;
+char *trace_path=NULL;
+int daemon_mode = 0;
+char *pidfile = NULL;
+
+struct ustconsumer_instance *instance;
+
+struct buffer_info_local {
+	/* output file */
+	int file_fd;
+	/* the offset we must truncate to, to unput the last subbuffer */
+	off_t previous_offset;
+};
+
+static int write_pidfile(const char *file_name, pid_t pid)
+{
+	FILE *pidfp;
+
+	pidfp = fopen(file_name, "w");
+	if(!pidfp) {
+		PERROR("fopen (%s)", file_name);
+		WARN("killing child process");
+		return -1;
+	}
+
+	fprintf(pidfp, "%d\n", pid);
+
+	fclose(pidfp);
+
+	return 0;
+}
+
+int create_dir_if_needed(char *dir)
+{
+	int result;
+	result = mkdir(dir, 0777);
+	if(result == -1) {
+		if(errno != EEXIST) {
+			PERROR("mkdir");
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+int unwrite_last_subbuffer(struct buffer_info *buf)
+{
+	int result;
+	struct buffer_info_local *buf_local = buf->user_data;
+
+	result = ftruncate(buf_local->file_fd, buf_local->previous_offset);
+	if(result == -1) {
+		PERROR("ftruncate");
+		return -1;
+	}
+
+	result = lseek(buf_local->file_fd, buf_local->previous_offset, SEEK_SET);
+	if(result == (int)(off_t)-1) {
+		PERROR("lseek");
+		return -1;
+	}
+
+	return 0;
+}
+
+int write_current_subbuffer(struct buffer_info *buf)
+{
+	int result;
+	struct buffer_info_local *buf_local = buf->user_data;
+
+	void *subbuf_mem = buf->mem + (buf->consumed_old & (buf->n_subbufs * buf->subbuf_size-1));
+
+	size_t cur_sb_size = subbuffer_data_size(subbuf_mem);
+
+	off_t cur_offset = lseek(buf_local->file_fd, 0, SEEK_CUR);
+	if(cur_offset == (off_t)-1) {
+		PERROR("lseek");
+		return -1;
+	}
+
+	buf_local->previous_offset = cur_offset;
+	DBG("previous_offset: %ld", cur_offset);
+
+	result = patient_write(buf_local->file_fd, subbuf_mem, cur_sb_size);
+	if(result == -1) {
+		PERROR("write");
+		return -1;
+	}
+
+	return 0;
+}
+
+int on_read_subbuffer(struct ustconsumer_callbacks *data, struct buffer_info *buf)
+{
+	return write_current_subbuffer(buf);
+}
+
+int on_read_partial_subbuffer(struct ustconsumer_callbacks *data, struct buffer_info *buf,
+				long subbuf_index, unsigned long valid_length)
+{
+	struct buffer_info_local *buf_local = buf->user_data;
+	char *tmp;
+	int result;
+	unsigned long pad_size;
+
+	result = patient_write(buf_local->file_fd, buf->mem + subbuf_index * buf->subbuf_size, valid_length);
+	if(result == -1) {
+		ERR("Error writing to buffer file");
+		return;
+	}
+
+	/* pad with empty bytes */
+	pad_size = PAGE_ALIGN(valid_length)-valid_length;
+	if(pad_size) {
+		tmp = zmalloc(pad_size);
+		result = patient_write(buf_local->file_fd, tmp, pad_size);
+		if(result == -1) {
+			ERR("Error writing to buffer file");
+			return;
+		}
+		free(tmp);
+	}
+
+}
+
+int on_open_buffer(struct ustconsumer_callbacks *data, struct buffer_info *buf)
+{
+	char *tmp;
+	int result;
+	int fd;
+	struct buffer_info_local *buf_local =
+		zmalloc(sizeof(struct buffer_info_local));
+
+	if(!buf_local) {
+		ERR("could not allocate buffer_info_local struct");
+		return 1;
+	}
+
+	buf->user_data = buf_local;
+
+	/* open file for output */
+	if(!trace_path) {
+		/* Only create the directory if using the default path, because
+		 * of the risk of typo when using trace path override. We don't
+		 * want to risk creating plenty of useless directories in that case.
+		 */
+		result = create_dir_if_needed(USTCONSUMER_DEFAULT_TRACE_PATH);
+		if(result == -1) {
+			ERR("could not create directory %s", USTCONSUMER_DEFAULT_TRACE_PATH);
+			return 1;
+		}
+
+		trace_path = USTCONSUMER_DEFAULT_TRACE_PATH;
+	}
+
+	if (asprintf(&tmp, "%s/%u_%lld", trace_path, buf->pid, buf->pidunique) < 0) {
+		ERR("on_open_buffer : asprintf failed (%s/%u_%lld)",
+		    trace_path, buf->pid, buf->pidunique);
+		return 1;
+	}
+	result = create_dir_if_needed(tmp);
+	if(result == -1) {
+		ERR("could not create directory %s", tmp);
+		free(tmp);
+		return 1;
+	}
+	free(tmp);
+
+	if (asprintf(&tmp, "%s/%u_%lld/%s", trace_path, buf->pid, buf->pidunique, buf->name) < 0) {
+		ERR("on_open_buffer : asprintf failed (%s/%u_%lld/%s)",
+		    trace_path, buf->pid, buf->pidunique, buf->name);
+		return 1;
+	}
+	result = fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 00600);
+	if(result == -1) {
+		PERROR("open");
+		ERR("failed opening trace file %s", tmp);
+		return 1;
+	}
+	buf_local->file_fd = fd;
+	free(tmp);
+
+	return 0;
+}
+
+int on_close_buffer(struct ustconsumer_callbacks *data, struct buffer_info *buf)
+{
+	struct buffer_info_local *buf_local = buf->user_data;
+	int result = close(buf_local->file_fd);
+	free(buf_local);
+	if(result == -1) {
+		PERROR("close");
+	}
+	return 0;
+}
+
+int on_put_error(struct ustconsumer_callbacks *data, struct buffer_info *buf)
+{
+	unwrite_last_subbuffer(buf);
+}
+
+struct ustconsumer_callbacks *new_callbacks()
+{
+	struct ustconsumer_callbacks *callbacks =
+		zmalloc(sizeof(struct ustconsumer_callbacks));
+
+	if(!callbacks)
+		return NULL;
+
+	callbacks->on_open_buffer = on_open_buffer;
+	callbacks->on_close_buffer = on_close_buffer;
+	callbacks->on_read_subbuffer = on_read_subbuffer;
+	callbacks->on_read_partial_subbuffer = on_read_partial_subbuffer;
+	callbacks->on_put_error = on_put_error;
+	callbacks->on_new_thread = NULL;
+	callbacks->on_close_thread = NULL;
+	callbacks->on_trace_end = NULL;
+
+	return callbacks;
+
+}
+
+int is_directory(const char *dir)
+{
+	int result;
+	struct stat st;
+
+	result = stat(dir, &st);
+	if(result == -1) {
+		PERROR("stat");
+		return 0;
+	}
+
+	if(!S_ISDIR(st.st_mode)) {
+		return 0;
+	}
+
+	return 1;
+}
+
+void usage(void)
+{
+	fprintf(stderr, "Usage:\nust-consumerd OPTIONS\n\nOptions:\n"
+			"\t-h\t\tDisplay this usage.\n"
+			"\t-o DIR\t\tSpecify the directory where to output the traces.\n"
+			"\t-s PATH\t\tSpecify the path to use for the daemon socket.\n"
+			"\t-d\t\tStart as a daemon.\n"
+			"\t--pidfile FILE\tWrite the PID in this file (when using -d).\n");
+}
+
+int parse_args(int argc, char **argv)
+{
+	int c;
+
+	while (1) {
+		int option_index = 0;
+		static struct option long_options[] = {
+			{"pidfile", 1, 0, 'p'},
+			{"help", 0, 0, 'h'},
+			{"version", 0, 0, 'V'},
+			{0, 0, 0, 0}
+		};
+
+		c = getopt_long(argc, argv, "hs:o:d", long_options, &option_index);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 0:
+			printf("option %s", long_options[option_index].name);
+			if (optarg)
+				printf(" with arg %s", optarg);
+			printf("\n");
+			break;
+		case 's':
+			sock_path = optarg;
+			break;
+		case 'o':
+			trace_path = optarg;
+			if(!is_directory(trace_path)) {
+				ERR("Not a valid directory. (%s)", trace_path);
+				return -1;
+			}
+			break;
+		case 'd':
+			daemon_mode = 1;
+			break;
+		case 'p':
+			pidfile = strdup(optarg);
+			break;
+		case 'h':
+			usage();
+			exit(0);
+		case 'V':
+			printf("Version 0.0\n");
+			break;
+
+		default:
+			/* unknown option or other error; error is
+			printed by getopt, just return */
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+void sigterm_handler(int sig)
+{
+	ustconsumer_stop_instance(instance, 0);
+}
+
+int start_ustconsumer(int fd)
+{
+	int result;
+	sigset_t sigset;
+	struct sigaction sa;
+
+	struct ustconsumer_callbacks *callbacks = new_callbacks();
+	if(!callbacks) {
+		PERROR("new_callbacks");
+		return 1;
+	}
+
+	result = sigemptyset(&sigset);
+	if(result == -1) {
+		PERROR("sigemptyset");
+		return 1;
+	}
+	sa.sa_handler = sigterm_handler;
+	sa.sa_mask = sigset;
+	sa.sa_flags = 0;
+	result = sigaction(SIGTERM, &sa, NULL);
+	if(result == -1) {
+		PERROR("sigaction");
+		return 1;
+	}
+	result = sigaction(SIGINT, &sa, NULL);
+	if(result == -1) {
+		PERROR("sigaction");
+		return 1;
+	}
+
+	instance = ustconsumer_new_instance(callbacks, sock_path);
+	if(!instance) {
+		ERR("failed to create ustconsumer instance");
+		return 1;
+	}
+
+	result = ustconsumer_init_instance(instance);
+	if(result) {
+		ERR("failed to initialize ustconsumer instance");
+		return 1;
+	}
+
+	/* setup handler for SIGPIPE */
+	result = sigemptyset(&sigset);
+	if(result == -1) {
+		PERROR("sigemptyset");
+		return 1;
+	}
+	result = sigaddset(&sigset, SIGPIPE);
+	if(result == -1) {
+		PERROR("sigaddset");
+		return 1;
+	}
+	result = sigprocmask(SIG_BLOCK, &sigset, NULL);
+	if(result == -1) {
+		PERROR("sigprocmask");
+		return 1;
+	}
+
+	/* Write pidfile */
+	if(pidfile) {
+		result = write_pidfile(pidfile, getpid());
+		if(result == -1) {
+			ERR("failed to write pidfile");
+			return 1;
+		}
+	}
+
+	/* Notify parent that we are successfully started. */
+	if(fd != -1) {
+		/* write any one character */
+		result = write(fd, "!", 1);
+		if(result == -1) {
+			PERROR("write");
+			return -1;
+		}
+		if(result != 1) {
+			ERR("Problem sending confirmation of daemon start to parent");
+			return -1;
+		}
+		result = close(fd);
+		if(result == -1) {
+			PERROR("close");
+		}
+	}
+
+	ustconsumer_start_instance(instance);
+
+	free(callbacks);
+
+	return 0;
+}
+
+int start_ustconsumer_daemon()
+{
+	int result;
+	int fd[2];
+	pid_t child_pid;
+
+	result = pipe(fd);
+
+	result = child_pid = fork();
+	if(result == -1) {
+		PERROR("fork");
+		return -1;
+	}
+	else if(result == 0) {
+		return start_ustconsumer(fd[1]);
+	}
+	else {
+		char buf;
+
+		result = read(fd[0], &buf, 1);
+		if(result == -1) {
+			PERROR("read");
+			return -1;
+		}
+		if(result != 1) {
+			ERR("did not receive valid confirmation that the daemon is started");
+			return -1;
+		}
+
+		result = close(fd[0]);
+		if(result == -1) {
+			PERROR("close");
+		}
+
+		DBG("The daemon is now successfully started");
+	}
+
+	/* Wait for confirmation that the server is ready. */
+
+
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	int result;
+
+	result = parse_args(argc, argv);
+	if(result == -1) {
+		exit(1);
+	}
+
+	if(daemon_mode) {
+		result = start_ustconsumer_daemon();
+	}
+	else {
+		result = start_ustconsumer(-1);
+	}
+
+	return result;
+}