fpm_trace_pread.c

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    /* (c) 2007,2008 Andrei Nigmatulin */
 
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#define _FILE_OFFSET_BITS 64
 
#include "fpm_config.h"
 
#include <unistd.h>
 
#include <fcntl.h>
#include <stdio.h>
#include <inttypes.h>
 
#include "fpm_trace.h"
#include "fpm_process_ctl.h"
#include "zlog.h"
 
static int mem_file = -1;
 
int fpm_trace_signal(pid_t pid) /* {{{ */
{
    if (0 > fpm_pctl_kill(pid, FPM_PCTL_STOP)) {
        zlog(ZLOG_SYSERROR, "failed to send SIGSTOP to %d", pid);
        return -1;
    }
    return 0;
}
/* }}} */
 
int fpm_trace_ready(pid_t pid) /* {{{ */
{
    char buf[128];
 
    snprintf(buf, sizeof(buf), "/proc/%d/" PROC_MEM_FILE, (int) pid);
    mem_file = open(buf, O_RDONLY);
    if (0 > mem_file) {
        zlog(ZLOG_SYSERROR, "failed to open %s", buf);
        return -1;
    }
    return 0;
}
/* }}} */
 
int fpm_trace_close(pid_t pid) /* {{{ */
{
    close(mem_file);
    mem_file = -1;
    return 0;
}
/* }}} */
 
int fpm_trace_get_long(long addr, long *data) /* {{{ */
{
    if (sizeof(*data) != pread(mem_file, (void *) data, sizeof(*data), (uintptr_t) addr)) {
        zlog(ZLOG_SYSERROR, "pread() failed");
        return -1;
    }
    return 0;
}
/* }}} */