Imported Upstream version 0.5.3upstream/0.5.3

1 files changed, 154 insertions, 0 deletions

diff --git a/libltrace.c b/libltrace.c
new file mode 100644
index 0000000..0f48d11
--- /dev/null
+++ b/libltrace.c
@@ -0,0 +1,154 @@
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/param.h>
+#include <signal.h>
+#include <sys/wait.h>
+
+#include "common.h"
+
+char *command = NULL;
+Process *list_of_processes = NULL;
+
+int exiting = 0;		/* =1 if a SIGINT or SIGTERM has been received */
+
+static void
+signal_alarm(int sig) {
+	Process *tmp = list_of_processes;
+
+	signal(SIGALRM, SIG_DFL);
+	while (tmp) {
+		struct opt_p_t *tmp2 = opt_p;
+		while (tmp2) {
+			if (tmp->pid == tmp2->pid) {
+				tmp = tmp->next;
+				if (!tmp) {
+					return;
+				}
+				tmp2 = opt_p;
+				continue;
+			}
+			tmp2 = tmp2->next;
+		}
+		debug(2, "Sending SIGSTOP to process %u\n", tmp->pid);
+		kill(tmp->pid, SIGSTOP);
+		tmp = tmp->next;
+	}
+}
+
+static void
+signal_exit(int sig) {
+	exiting = 1;
+	debug(1, "Received interrupt signal; exiting...");
+	signal(SIGINT, SIG_IGN);
+	signal(SIGTERM, SIG_IGN);
+	signal(SIGALRM, signal_alarm);
+	if (opt_p) {
+		struct opt_p_t *tmp = opt_p;
+		while (tmp) {
+			debug(2, "Sending SIGSTOP to process %u\n", tmp->pid);
+			kill(tmp->pid, SIGSTOP);
+			tmp = tmp->next;
+		}
+	}
+	alarm(1);
+}
+
+static void
+normal_exit(void) {
+	output_line(0, 0);
+	if (options.summary) {
+		show_summary();
+	}
+	if (options.output) {
+		fclose(options.output);
+		options.output = NULL;
+	}
+}
+
+void
+ltrace_init(int argc, char **argv) {
+	struct opt_p_t *opt_p_tmp;
+
+	atexit(normal_exit);
+	signal(SIGINT, signal_exit);	/* Detach processes when interrupted */
+	signal(SIGTERM, signal_exit);	/*  ... or killed */
+
+	argv = process_options(argc, argv);
+	while (opt_F) {
+		/* If filename begins with ~, expand it to the user's home */
+		/* directory. This does not correctly handle ~yoda, but that */
+		/* isn't as bad as it seems because the shell will normally */
+		/* be doing the expansion for us; only the hardcoded */
+		/* ~/.ltrace.conf should ever use this code. */
+		if (opt_F->filename[0] == '~') {
+			char path[PATH_MAX];
+			char *home_dir = getenv("HOME");
+			if (home_dir) {
+				strncpy(path, home_dir, PATH_MAX - 1);
+				path[PATH_MAX - 1] = '\0';
+				strncat(path, opt_F->filename + 1,
+						PATH_MAX - strlen(path) - 1);
+				read_config_file(path);
+			}
+		} else {
+			read_config_file(opt_F->filename);
+		}
+		opt_F = opt_F->next;
+	}
+	if (opt_e) {
+		struct opt_e_t *tmp = opt_e;
+		while (tmp) {
+			debug(1, "Option -e: %s\n", tmp->name);
+			tmp = tmp->next;
+		}
+	}
+	if (command) {
+		execute_program(open_program(command, 0), argv);
+	}
+	opt_p_tmp = opt_p;
+	while (opt_p_tmp) {
+		open_pid(opt_p_tmp->pid);
+		opt_p_tmp = opt_p_tmp->next;
+	}
+}
+
+static int num_ltrace_callbacks[EVENT_MAX];
+static callback_func * ltrace_callbacks[EVENT_MAX];
+
+void
+ltrace_add_callback(callback_func func, Event_type type) {
+	ltrace_callbacks[type] = realloc(ltrace_callbacks[type], (num_ltrace_callbacks[type]+1)*sizeof(callback_func));
+	ltrace_callbacks[type][num_ltrace_callbacks[type]++] = func;
+}
+
+static void
+dispatch_callbacks(Event * ev) {
+	int i;
+	/* Ignoring case 1: signal into a dying tracer */
+	if (ev->type==EVENT_SIGNAL && 
+			exiting && ev->e_un.signum == SIGSTOP) {
+		return;
+	}
+	/* Ignoring case 2: process being born before a clone event */
+	if (ev->proc && ev->proc->state == STATE_IGNORED) {
+		return;
+	}
+	for (i=0; i<num_ltrace_callbacks[ev->type]; i++) {
+		ltrace_callbacks[ev->type][i](ev);
+	}
+}
+
+void
+ltrace_main(void) {
+	Event * ev;
+	while (1) {
+		ev = next_event();
+		dispatch_callbacks(ev);
+		handle_event(ev);
+	}
+}