/proc/N/maps 信息是如何生成的？

以进程1为例，查看proc长什么样子？

127|shell@tiny4412:/proc/1 # ls -l  dr-xr-xr-x root     root              2014-01-01 12:07 attr-r-------- root     root            0 2014-01-01 12:07 auxv-r--r--r-- root     root            0 2014-01-01 12:07 cgroup--w------- root     root            0 2014-01-01 12:07 clear_refs-r--r--r-- root     root            0 2014-01-01 12:00 cmdline-rw-r--r-- root     root            0 2014-01-01 12:07 comm-rw-r--r-- root     root            0 2014-01-01 12:07 coredump_filterlrwxrwxrwx root     root              2014-01-01 12:07 cwd -> /-r-------- root     root            0 2014-01-01 12:07 environlrwxrwxrwx root     root              2014-01-01 12:07 exe -> /initdr-x------ root     root              2014-01-01 12:07 fddr-x------ root     root              2014-01-01 12:07 fdinfo-r--r--r-- root     root            0 2014-01-01 12:07 limits-rw-r--r-- root     root            0 2014-01-01 12:07 loginuid-r--r--r-- root     root            0 2014-01-01 12:07 maps ----------->比较关心映射关系是如何生成的-rw------- root     root            0 2014-01-01 12:07 mem-r--r--r-- root     root            0 2014-01-01 12:07 mountinfo-r--r--r-- root     root            0 2014-01-01 12:07 mounts-r-------- root     root            0 2014-01-01 12:07 mountstatsdr-xr-xr-x root     root              2014-01-01 12:00 netdr-x--x--x root     root              2014-01-01 12:07 ns-rw-r--r-- root     root            0 2014-01-01 12:07 oom_adj-r--r--r-- root     root            0 2014-01-01 12:07 oom_killed-r--r--r-- root     root            0 2014-01-01 12:07 oom_score-rw-r--r-- root     root            0 2014-01-01 12:00 oom_score_adj-r--r--r-- root     root            0 2014-01-01 12:07 pagemap-r--r--r-- root     root            0 2014-01-01 12:07 personalitylrwxrwxrwx root     root              2014-01-01 12:07 root -> /-rw-r--r-- root     root            0 2014-01-01 12:07 sched-r--r--r-- root     root            0 2014-01-01 12:07 schedstat-r--r--r-- root     root            0 2014-01-01 12:07 sessionid-r--r--r-- root     root            0 2014-01-01 12:00 smaps-r--r--r-- root     root            0 2014-01-01 12:07 stack-r--r--r-- root     root            0 2014-01-01 12:00 stat-r--r--r-- root     root            0 2014-01-01 12:07 statm-r--r--r-- root     root            0 2014-01-01 12:07 statusdr-xr-xr-x root     root              2014-01-01 12:00 task-r--r--r-- root     root            0 2014-01-01 12:07 wchan

查看详细映射关系：

shell@tiny4412:/proc/1 # cat maps                                              00008000-00049000 r-xp 00000000 00:01 1422       /init0004a000-0004c000 r--p 00041000 00:01 1422       /init0004c000-0004f000 rw-p 00043000 00:01 1422       /init0004f000-00052000 rw-p 00000000 00:00 0          [heap]40017000-40019000 rw-p 00000000 00:00 0 40072000-40073000 r--p 00000000 00:00 0 40090000-400b0000 rw-s 00000000 00:0c 2056       /dev/__properties__400b2000-400b3000 rw-p 00000000 00:00 0 40100000-40301000 rw-p 00000000 00:00 0 becd2000-becf3000 rw-p 00000000 00:00 0          [stack]ffff0000-ffff1000 r-xp 00000000 00:00 0          [vectors]根据源码的解析：vm_area_struct     unsigned long vm_start;        /* Our start address within vm_mm. */    unsigned long vm_end;        /* The first byte after our end address                       within vm_mm. */    unsigned long vm_flags;        /* Flags, see mm.h. */ 分别是读，写，共享/私有    /* Information about our backing store: */    unsigned long vm_pgoff;        /* Offset (within vm_file) in PAGE_SIZE 页偏移                       units, *not* PAGE_CACHE_SIZE */vma->vm_file->f_path.dentry->d_inode-->i_sb->s_dev; 主设备号，次设备号
vma->vm_file->f_path.dentry->d_inode-->i_ino inode 号最后就是    /*     * Print the dentry name for named mappings, and a     * special [heap] marker for the heap:     */调用文件路径

linux源码位置及主要宏
android/linux-3.0.86/fs/proc/base.c
static const struct pid_entry tid_base_stuff[] = {DIR("fd",        S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),DIR("fdinfo",    S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),REG("environ",   S_IRUSR, proc_environ_operations),INF("auxv",      S_IRUSR, proc_pid_auxv),ONE("status",    S_IRUGO, proc_pid_status),ONE("personality", S_IRUGO, proc_pid_personality),INF("limits", S_IRUGO, proc_pid_limits),#ifdef CONFIG_SCHED_DEBUGREG("sched",     S_IRUGO|S_IWUSR, proc_pid_sched_operations),#endifREG("comm",      S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),#ifdef CONFIG_HAVE_ARCH_TRACEHOOKINF("syscall",   S_IRUGO, proc_pid_syscall),#endifINF("cmdline",   S_IRUGO, proc_pid_cmdline),ONE("stat",      S_IRUGO, proc_tid_stat),ONE("statm",     S_IRUGO, proc_pid_statm),REG("maps",      S_IRUGO, proc_maps_operations), -------------------->关注映射#ifdef CONFIG_NUMAREG("numa_maps", S_IRUGO, proc_numa_maps_operations),#endifREG("mem",       S_IRUSR|S_IWUSR, proc_mem_operations),LNK("cwd",       proc_cwd_link),LNK("root",      proc_root_link),LNK("exe",       proc_exe_link),REG("mounts",    S_IRUGO, proc_mounts_operations),REG("mountinfo",  S_IRUGO, proc_mountinfo_operations),#ifdef CONFIG_PROC_PAGE_MONITORREG("clear_refs", S_IWUSR, proc_clear_refs_operations),REG("smaps",     S_IRUGO, proc_smaps_operations),REG("pagemap",    S_IRUGO, proc_pagemap_operations),#endif#ifdef CONFIG_SECURITYDIR("attr",      S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),#endif#ifdef CONFIG_KALLSYMSINF("wchan",     S_IRUGO, proc_pid_wchan),#endif#ifdef CONFIG_STACKTRACEONE("stack",      S_IRUGO, proc_pid_stack),#endif#ifdef CONFIG_SCHEDSTATSINF("schedstat", S_IRUGO, proc_pid_schedstat),#endif#ifdef CONFIG_LATENCYTOPREG("latency",  S_IRUGO, proc_lstats_operations),#endif#ifdef CONFIG_PROC_PID_CPUSETREG("cpuset",    S_IRUGO, proc_cpuset_operations),#endif#ifdef CONFIG_CGROUPSREG("cgroup",  S_IRUGO, proc_cgroup_operations),#endifINF("oom_score", S_IRUGO, proc_oom_score),REG("oom_adj",   S_IRUGO|S_IWUSR, proc_oom_adjust_operations),REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),#ifdef CONFIG_ANDROIDREG("oom_killed", S_IRUGO, proc_oom_killed_operations),#endif#ifdef CONFIG_AUDITSYSCALLREG("loginuid",  S_IWUSR|S_IRUGO, proc_loginuid_operations),REG("sessionid",  S_IRUGO, proc_sessionid_operations),#endif#ifdef CONFIG_FAULT_INJECTIONREG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),#endif#ifdef CONFIG_TASK_IO_ACCOUNTINGINF("io",S_IRUSR, proc_tid_io_accounting),#endif#ifdef CONFIG_HARDWALLINF("hardwall",   S_IRUGO, proc_pid_hardwall),#endif};


pid_entry 是一个什么样的结构体？
struct pid_entry {
    char *name;  -------->这个应该就是proc目录下面对应文件名或者文件夹名称
    int len;
    mode_t mode; --------->权限
    const struct inode_operations *iop; --------------->与inode 对应，我们在操作文件的时候，先找到文件名，然后通过文件名及路径找到inode,再通过inode找到它的操作方法
    const struct file_operations *fop;
    union proc_op op; 
};

#define NOD(NAME, MODE, IOP, FOP, OP) {            \
    .name = (NAME),                    \
    .len  = sizeof(NAME) - 1,            \
    .mode = MODE,                    \
    .iop  = IOP,                    \
    .fop  = FOP,                    \
    .op   = OP,                    \
}

#define DIR(NAME, MODE, iops, fops)    \
    NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) ----------->对应目录信息的填充宏
例子：    DIR("fd",        S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations)
dr-x------ root     root              2014-01-01 12:07 fd

#define LNK(NAME, get_link)                    \
    NOD(NAME, (S_IFLNK|S_IRWXUGO),                \
        &proc_pid_link_inode_operations, NULL,        \ ----->链接文件
        { .proc_get_link = get_link } ) ------------------------>设置的是链接信息
例子：    LNK("cwd",       proc_cwd_link),
    LNK("root",      proc_root_link),
    LNK("exe",       proc_exe_link),
lrwxrwxrwx root     root              2014-01-01 12:07 cwd -> /   ----->当前工作目录


#define REG(NAME, MODE, fops)                \
    NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})--------->普通文件,只包含file_operation，因为仅仅是一个文件
REG("maps",      S_IRUGO, proc_maps_operations),
const struct file_operations proc_maps_operations = {
    .open        = maps_open,
    .read        = seq_read,              ------------------>和序列文件有关系
    .llseek        = seq_lseek,
    .release    = seq_release_private,
};

#define INF(NAME, MODE, read)                \
    NOD(NAME, (S_IFREG|(MODE)),             \
        NULL, &proc_info_file_operations,    \
        { .proc_read = read } )
static const struct file_operations proc_info_file_operations = {-------->支持信息读取
    .read        = proc_info_read,
    .llseek        = generic_file_llseek,
};
例子：    INF("cmdline",   S_IRUGO, proc_pid_cmdline),
-r--r--r-- root     root            0 2014-01-01 12:00 cmdline

#define ONE(NAME, MODE, show)                \--------->单个文件？什么意思？
    NOD(NAME, (S_IFREG|(MODE)),             \
        NULL, &proc_single_file_operations,    \ 
        { .proc_show = show } )-------->填充的是proc_show，可以看出ONE，INFO，LINK等的其中一个差别就是设置prop_op 不一样，另外一个是file_operation不一样
例子：
#ifdef CONFIG_STACKTRACE
    ONE("stack",      S_IRUGO, proc_pid_stack),
#endif
-r--r--r-- root     root            0 2014-01-01 12:07 stack 只读信息

/* ANDROID is for special files in /proc. */ --------------------------->还冒出来一个android相关的
#define ANDROID(NAME, MODE, OTYPE)            \
    NOD(NAME, (S_IFREG|(MODE)),            \
        &proc_##OTYPE##_inode_operations,    \
        &proc_##OTYPE##_operations, {})
例子：
    ANDROID("oom_adj",S_IRUGO|S_IWUSR, oom_adjust), ----------------->调整优先级，我们的service,activity 相关的进程分前端，后端优先级不一样会动态调整，不知道是不是通过这个调整的？有一个特别的地方是具体有写权限。
-rw-r--r-- root     root            0 2014-01-01 12:07 oom_adj

union proc_op {------------------------------------------------------------->联合体，同时只会存在一种可能。
    int (*proc_get_link)(struct inode *, struct path *);
    int (*proc_read)(struct task_struct *task, char *page);
    int (*proc_show)(struct seq_file *m,
        struct pid_namespace *ns, struct pid *pid,
        struct task_struct *task);
};

下面详细查看maps 相关的实现内容
代码位置：
android/linux-3.0.86/fs/proc/task_mmu.c
const struct file_operations proc_maps_operations = {.open= maps_open,.read= seq_read,.llseek= seq_lseek,.release= seq_release_private,};
使用strace 跟踪一下cat maps 的执行情况：
1|shell@tiny4412:/proc/1 # strace cat maps                                     execve("/system/bin/cat", ["cat", "maps"], [/* 24 vars */]) = 0mprotect(0x401db000, 4096, PROT_READ)   = 0set_tid_address(0x401dced0)             = 10588set_tls(0x401dd10c, 0x401dd10c, 0x401dd10c, 0x401dcedc, 0x401dcec8) = 0mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40027000madvise(0x40027000, 8192, MADV_MERGEABLE) = -1 EINVAL (Invalid argument)sigaltstack({ss_sp=0x40027000, ss_flags=0, ss_size=8192}, NULL) = 0sigaction(SIGABRT, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}, NULL) = 0sigaction(SIGBUS, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}, NULL) = 0sigaction(SIGFPE, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}, NULL) = 0sigaction(SIGILL, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}, NULL) = 0sigaction(SIGPIPE, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}, NULL) = 0sigaction(SIGSEGV, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}, NULL) = 0sigaction(SIGSTKFLT, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}, NULL) = 0sigaction(SIGTRAP, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}, NULL) = 0mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0) = 0x4009e000prctl(0x53564d41 /* PR_??? */, 0, 0x4009e000, 0x1000, 0x401d87ca) = -1 EINVAL (Invalid argument)openat(AT_FDCWD, "/vendor/lib/libsigchain.so", O_RDONLY) = -1 ENOENT (No such file or directory)openat(AT_FDCWD, "/system/lib/libsigchain.so", O_RDONLY) = 3fstat64(3, {st_mode=S_IFREG|0644, st_size=5352, ...}) = 0read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0\0\0\0004\0\0\0"..., 52) = 52mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40100000mmap2(NULL, 12288, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x401de000mmap2(0x401de000, 2953, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x401de000mmap2(0x401df000, 4100, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x401df000openat(AT_FDCWD, "/vendor/lib/libc.so", O_RDONLY) = -1 ENOENT (No such file or directory)openat(AT_FDCWD, "/system/lib/libc.so", O_RDONLY) = 4fstat64(4, {st_mode=S_IFREG|0644, st_size=608820, ...}) = 0read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0\0\0\0004\0\0\0"..., 52) = 52mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 4, 0) = 0x40067000mmap2(NULL, 483328, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40143000mmap2(0x40143000, 414868, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 4, 0) = 0x40143000mmap2(0x401aa000, 21808, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 4, 0x66000) = 0x401aa000mmap2(0x401b0000, 36864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x401b0000mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0) = 0x40101000prctl(0x53564d41 /* PR_??? */, 0, 0x40101000, 0x1000, 0x401d87ca) = -1 EINVAL (Invalid argument)mprotect(0x401aa000, 12288, PROT_READ)  = 0munmap(0x40067000, 4096)                = 0close(4)                                = 0openat(AT_FDCWD, "/vendor/lib/liblog.so", O_RDONLY) = -1 ENOENT (No such file or directory)openat(AT_FDCWD, "/system/lib/liblog.so", O_RDONLY) = 4fstat64(4, {st_mode=S_IFREG|0644, st_size=21744, ...}) = 0read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0\0\0\0004\0\0\0"..., 52) = 52mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 4, 0) = 0x40042000mmap2(NULL, 28672, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4006d000mmap2(0x4006d000, 16860, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 4, 0) = 0x4006d000mmap2(0x40072000, 4108, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 4, 0x4000) = 0x40072000openat(AT_FDCWD, "/vendor/lib/libm.so", O_RDONLY) = -1 ENOENT (No such file or directory)openat(AT_FDCWD, "/system/lib/libm.so", O_RDONLY) = 5fstat64(5, {st_mode=S_IFREG|0644, st_size=95508, ...}) = 0read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0\0\0\0004\0\0\0"..., 52) = 52mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 5, 0) = 0x40074000mmap2(NULL, 102400, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40122000mmap2(0x40122000, 90404, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 5, 0) = 0x40122000mmap2(0x40139000, 4204, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 5, 0x16000) = 0x40139000mprotect(0x40139000, 4096, PROT_READ)   = 0munmap(0x40074000, 4096)                = 0close(5)                                = 0openat(AT_FDCWD, "/vendor/lib/libstdc++.so", O_RDONLY) = -1 ENOENT (No such file or directory)openat(AT_FDCWD, "/system/lib/libstdc++.so", O_RDONLY) = 5fstat64(5, {st_mode=S_IFREG|0644, st_size=9396, ...}) = 0read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0\0\0\0004\0\0\0"..., 52) = 52mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 5, 0) = 0x40021000mmap2(NULL, 16384, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40074000mmap2(0x40074000, 5782, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 5, 0) = 0x40074000mmap2(0x40076000, 4100, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 5, 0x1000) = 0x40076000mprotect(0x40076000, 4096, PROT_READ)   = 0munmap(0x40021000, 4096)                = 0close(5)                                = 0mprotect(0x40072000, 4096, PROT_READ)   = 0munmap(0x40042000, 4096)                = 0close(4)                                = 0mprotect(0x401df000, 4096, PROT_READ)   = 0munmap(0x40100000, 4096)                = 0close(3)                                = 0openat(AT_FDCWD, "/vendor/lib/libcrypto.so", O_RDONLY) = -1 ENOENT (No such file or directory)openat(AT_FDCWD, "/system/lib/libcrypto.so", O_RDONLY) = 3fstat64(3, {st_mode=S_IFREG|0644, st_size=1052960, ...}) = 0read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0\0\0\0004\0\0\0"..., 52) = 52mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 3, 0) = 0x4003a000mmap2(NULL, 1064960, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x401e1000mmap2(0x401e1000, 966164, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x401e1000mmap2(0x402ce000, 84864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xec000) = 0x402ce000mmap2(0x402e3000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x402e3000mprotect(0x402ce000, 61440, PROT_READ)  = 0munmap(0x4003a000, 4096)                = 0close(3)                                = 0openat(AT_FDCWD, "/vendor/lib/libcutils.so", O_RDONLY) = -1 ENOENT (No such file or directory)openat(AT_FDCWD, "/system/lib/libcutils.so", O_RDONLY) = 3fstat64(3, {st_mode=S_IFREG|0644, st_size=46480, ...}) = 0read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0\0\0\0004\0\0\0"..., 52) = 52mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40098000mmap2(NULL, 53248, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40102000mmap2(0x40102000, 42896, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x40102000mmap2(0x4010d000, 4160, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xa000) = 0x4010d000mprotect(0x4010d000, 4096, PROT_READ)   = 0munmap(0x40098000, 4096)                = 0close(3)                                = 0openat(AT_FDCWD, "/vendor/lib/libselinux.so", O_RDONLY) = -1 ENOENT (No such file or directory)openat(AT_FDCWD, "/system/lib/libselinux.so", O_RDONLY) = 3fstat64(3, {st_mode=S_IFREG|0644, st_size=50564, ...}) = 0read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0\0\0\0004\0\0\0"..., 52) = 52mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 3, 0) = 0x400dc000mmap2(NULL, 57344, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x402e5000mmap2(0x402e5000, 47462, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x402e5000mmap2(0x402f1000, 4144, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xb000) = 0x402f1000mprotect(0x402f1000, 4096, PROT_READ)   = 0munmap(0x400dc000, 4096)                = 0close(3)                                = 0mprotect(0x400dd000, 4096, PROT_READ)   = 0openat(AT_FDCWD, "/dev/__properties__", O_RDONLY|O_NOFOLLOW) = 3--------------->打开文件fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0fstat64(3, {st_mode=S_IFREG|0444, st_size=131072, ...}) = 0mmap2(NULL, 131072, PROT_READ, MAP_SHARED, 3, 0) = 0x402f3000close(3)                                = 0futex(0x401af5a8, FUTEX_WAKE_PRIVATE, 2147483647) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0openat(AT_FDCWD, "/vendor/lib/libnetd_client.so", O_RDONLY) = -1 ENOENT (No such file or directory)openat(AT_FDCWD, "/system/lib/libnetd_client.so", O_RDONLY) = 3fstat64(3, {st_mode=S_IFREG|0644, st_size=9428, ...}) = 0read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\0\0\0\0004\0\0\0"..., 52) = 52mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE, 3, 0) = 0x400dc000mmap2(NULL, 16384, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x4010f000mmap2(0x4010f000, 3856, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x4010f000mmap2(0x40111000, 4100, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x1000) = 0x40111000mprotect(0x40111000, 4096, PROT_READ)   = 0munmap(0x400dc000, 4096)                = 0close(3)                                = 0mprotect(0x4009e000, 4096, PROT_READ)   = 0mprotect(0x40101000, 4096, PROT_READ)   = 0mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0) = 0x40046000prctl(0x53564d41 /* PR_??? */, 0, 0x40046000, 0x1000, 0x401d87ca) = -1 EINVAL (Invalid argument)futex(0x401b0dd4, FUTEX_WAKE_PRIVATE, 2147483647) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0brk(0)                                  = 0x41525000mmap2(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40313000madvise(0x40313000, 1048576, MADV_MERGEABLE) = -1 EINVAL (Invalid argument)prctl(0x53564d41 /* PR_??? */, 0, 0x40313000, 0x100000, 0x401a1685) = -1 EINVAL (Invalid argument)munmap(0x40313000, 1048576)             = 0mmap2(NULL, 2093056, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40313000prctl(0x53564d41 /* PR_??? */, 0, 0x40313000, 0x1ff000, 0x401a1685) = -1 EINVAL (Invalid argument)munmap(0x40313000, 970752)              = 0munmap(0x40500000, 73728)               = 0mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40100000mprotect(0x40100000, 4096, PROT_READ)   = 0openat(AT_FDCWD, "/proc/stat", O_RDONLY) = 3 ----------------------->打开文件fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0mmap2(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40500000prctl(0x53564d41 /* PR_??? */, 0, 0x40500000, 0x100000, 0x401a1685) = -1 EINVAL (Invalid argument)mprotect(0x40100000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40100000, 4096, PROT_READ)   = 0read(3, "cpu  5457 1230 13251 421214 1598"..., 1024) = 1024read(3, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 1024) = 212read(3, "", 1024)                       = 0close(3)                                = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0statfs64("/sys/fs/selinux", 88, {f_type=0xf97cff8c, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=4128}) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT ABRT KILL USR1 USR2 PIPE ALRM TERM STKFLT CHLD CONT STOP TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH IO PWR SYS RTMIN], [], 8) = 0sigaction(SIGILL, {0x402a3b6d, ~[ILL TRAP BUS FPE SEGV], 0}, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}) = 0rt_sigprocmask(SIG_BLOCK, [], [HUP INT QUIT ABRT USR1 USR2 PIPE ALRM TERM STKFLT CHLD CONT TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH IO PWR SYS RTMIN], 8) = 0--- SIGILL {si_signo=SIGILL, si_code=ILL_ILLOPC, si_addr=0x40223908} ---rt_sigprocmask(SIG_SETMASK, [HUP INT QUIT ABRT USR1 USR2 PIPE ALRM TERM STKFLT CHLD CONT TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH IO PWR SYS RTMIN], [HUP INT QUIT ILL ABRT USR1 USR2 PIPE ALRM TERM 0sigaction(SIGILL, {0x401cea25, [], SA_RESTART|SA_SIGINFO|SA_ONSTACK}, NULL) = 0rt_sigprocmask(SIG_SETMASK, [], [HUP INT QUIT ABRT USR1 USR2 PIPE ALRM TERM STKFLT CHLD CONT TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH IO PWR SYS RTMIN], 8) = 0mprotect(0x4009e000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40101000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x4009e000, 4096, PROT_READ)   = 0mprotect(0x40101000, 4096, PROT_READ)   = 0mprotect(0x40100000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40100000, 4096, PROT_READ)   = 0 openat(AT_FDCWD, "maps", O_RDONLY)      = 3 ----------->打开maps文件------------------------------------------------------------------------------------------------------------------------>这一块都是输出了 fstat64(1, {st_mode=S_IFCHR|0666, st_rdev=makedev(204, 64), ...}) = 0read(3, "00008000-00049000 r-xp 00000000 "..., 4096) = 570write(1, "00008000-00049000 r-xp 00000000 "..., 57000008000-00049000 r-xp 00000000 00:01 1422       /init0004a000-0004c000 r--p 00041000 00:01 1422       /init0004c000-0004f000 rw-p 00043000 00:01 1422       /init0004f000-00052000 rw-p 00000000 00:00 0          [heap]40017000-40019000 rw-p 00000000 00:00 0 40072000-40073000 r--p 00000000 00:00 0 40090000-400b0000 rw-s 00000000 00:0c 2056       /dev/__properties__400b2000-400b3000 rw-p 00000000 00:00 0 40100000-40301000 rw-p 00000000 00:00 0 becd2000-becf3000 rw-p 00000000 00:00 0          [stack]ffff0000-ffff1000 r-xp 00000000 00:00 0          [vectors]) = 570read(3, "", 4096)                       = 0close(3)                                = 0close(1)                                = 0mprotect(0x40100000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40100000, 4096, PROT_READ)   = 0close(0)                                = 0close(2)                                = 0futex(0x401af5a0, FUTEX_WAKE_PRIVATE, 2147483647) = 0mprotect(0x40100000, 4096, PROT_READ|PROT_WRITE) = 0mprotect(0x40100000, 4096, PROT_READ)   = 0munmap(0x40100000, 4096)                = 0exit_group(0)                           = ?+++ exited with 0 +++

跟踪源码，先看一下maps_open
static int maps_open(struct inode *inode, struct file *file){return do_maps_open(inode, file, &proc_pid_maps_op); ----------->填充了proc_pid_maps_op的操作，序列文件的op}

static const struct seq_operations proc_pid_maps_op = {.start= m_start,.next= m_next,.stop= m_stop,.show= show_map};

static int do_maps_open(struct inode *inode, struct file *file,const struct seq_operations *ops){struct proc_maps_private *priv;int ret = -ENOMEM;priv = kzalloc(sizeof(*priv), GFP_KERNEL);--------->分配memory?if (priv) {priv->pid = proc_pid(inode);-------->通过inode获取pid信息ret = seq_open(file, ops);------------->打开序列文件if (!ret) {struct seq_file *m = file->private_data; m->private = priv;} else {kfree(priv);}}return ret;}
proc_maps_private 为何物？
struct proc_maps_private {struct pid *pid;-------------------->仅仅一个pid并不简单，不能跟太深，会迷失...struct task_struct *task;--------->进程相关的信息#ifdef CONFIG_MMUstruct vm_area_struct *tail_vma; #endif};

static inline struct pid *proc_pid(struct inode *inode){return PROC_I(inode)->pid;------------->根据inode可以找到对应的进程id}
static inline struct proc_inode *PROC_I(const struct inode *inode){return container_of(inode, struct proc_inode, vfs_inode);}

通过inode 进而找到proc_inode，然后再找到pid
struct proc_inode {struct pid *pid;--------------------->找到了....int fd;union proc_op op;struct proc_dir_entry *pde;struct ctl_table_header *sysctl;struct ctl_table *sysctl_entry;void *ns;const struct proc_ns_operations *ns_ops;struct inode vfs_inode;------------------->知道地之后，计算偏移，就可以找到pid了};
序列文件？
int seq_open(struct file *file, const struct seq_operations *op){struct seq_file *p = file->private_data; ---------->难道数据存储在file的private_data，什么时候第一次生成的呢？理论上该是在进程创建的时候。if (!p) {p = kmalloc(sizeof(*p), GFP_KERNEL);---------》如果为空，那么就分配一个，并将地址存放到file的似有空间里面。if (!p)return -ENOMEM;file->private_data = p;}memset(p, 0, sizeof(*p));mutex_init(&p->lock);p->op = op;----------------------------->填充之前传进来的proc_pid_maps_op， 即使是空的，也就是至少准备了一个seq_file/* * Wrappers around seq_open(e.g. swaps_open) need to be * aware of this. If they set f_version themselves, they * should call seq_open first and then set f_version. */file->f_version = 0;/* * seq_files support lseek() and pread().  They do not implement * write() at all, but we clear FMODE_PWRITE here for historical * reasons. * * If a client of seq_files a) implements file.write() and b) wishes to * support pwrite() then that client will need to implement its own * file.open() which calls seq_open() and then sets FMODE_PWRITE. */file->f_mode &= ~FMODE_PWRITE;return 0;}

看一下seq_file到底是什么样子？
struct seq_file {char *buf;size_t size;size_t from;size_t count;loff_t index;loff_t read_pos;u64 version;struct mutex lock;const struct seq_operations *op;void *private;};

感觉就是一段buffer，然后增加了版本，代写哦啊，偏移位置，锁以及ops等信息
那么接下来应该是读取了？因为理论上应该是先open，然后读取的
ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos){struct seq_file *m = file->private_data; -------------->不知道这个数据是不是空的啊？现在应该不是空的了，上面已经填充了...size_t copied = 0;loff_t pos;size_t n;void *p;int err = 0;mutex_lock(&m->lock);/* Don't assume *ppos is where we left it */if (unlikely(*ppos != m->read_pos)) {m->read_pos = *ppos;while ((err = traverse(m, *ppos)) == -EAGAIN) ---------------->1. 做什么？;if (err) {/* With prejudice... */m->read_pos = 0;m->version = 0;m->index = 0;m->count = 0;goto Done;}}/* * seq_file->op->..m_start/m_stop/m_next may do special actions * or optimisations based on the file->f_version, so we want to * pass the file->f_version to those methods. * * seq_file->version is just copy of f_version, and seq_file * methods can treat it simply as file version. * It is copied in first and copied out after all operations. * It is convenient to have it as  part of structure to avoid the * need of passing another argument to all the seq_file methods. */m->version = file->f_version;/* grab buffer if we didn't have one */if (!m->buf) {m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL);if (!m->buf)goto Enomem;}/* if not empty - flush it first */if (m->count) {n = min(m->count, size);err = copy_to_user(buf, m->buf + m->from, n);if (err)goto Efault;m->count -= n;m->from += n;size -= n;buf += n;copied += n;if (!m->count)m->index++;if (!size)goto Done;}/* we need at least one record in buffer */pos = m->index;p = m->op->start(m, &pos);while (1) {err = PTR_ERR(p);if (!p || IS_ERR(p))break;err = m->op->show(m, p); ------------->显示？if (err < 0)break;if (unlikely(err))m->count = 0;if (unlikely(!m->count)) {p = m->op->next(m, p, &pos);m->index = pos;continue;}if (m->count < m->size)goto Fill;m->op->stop(m, p);kfree(m->buf);m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);if (!m->buf)goto Enomem;m->count = 0;m->version = 0;pos = m->index;p = m->op->start(m, &pos);}m->op->stop(m, p);m->count = 0;goto Done;Fill:/* they want more? let's try to get some more */while (m->count < size) {size_t offs = m->count;loff_t next = pos;p = m->op->next(m, p, &next);if (!p || IS_ERR(p)) {err = PTR_ERR(p);break;}err = m->op->show(m, p);if (m->count == m->size || err) {m->count = offs;if (likely(err <= 0))break;}pos = next;}m->op->stop(m, p);n = min(m->count, size);err = copy_to_user(buf, m->buf, n);if (err)goto Efault;copied += n;m->count -= n;if (m->count)m->from = n;elsepos++;m->index = pos;Done:if (!copied)copied = err;else {*ppos += copied;m->read_pos += copied;}file->f_version = m->version;mutex_unlock(&m->lock);return copied;Enomem:err = -ENOMEM;goto Done;Efault:err = -EFAULT;goto Done;}EXPORT_SYMBOL(seq_read);

traverse 做了什么呢？
static int traverse(struct seq_file *m, loff_t offset){loff_t pos = 0, index;int error = 0;void *p;m->version = 0;index = 0;m->count = m->from = 0;if (!offset) {m->index = index;return 0;}if (!m->buf) { ---------------->这个都不知道是不是空的？m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL);if (!m->buf)return -ENOMEM;}p = m->op->start(m, &index);-----------调用m_start，是准备什么吗？while (p) {error = PTR_ERR(p);if (IS_ERR(p))break;error = m->op->show(m, p);if (error < 0)break;if (unlikely(error)) {error = 0;m->count = 0;}if (m->count == m->size)goto Eoverflow;if (pos + m->count > offset) {m->from = offset - pos;m->count -= m->from;m->index = index;break;}pos += m->count;m->count = 0;if (pos == offset) {index++;m->index = index;break;}p = m->op->next(m, p, &index);}m->op->stop(m, p);m->index = index;return error;Eoverflow:m->op->stop(m, p);kfree(m->buf);m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);return !m->buf ? -ENOMEM : -EAGAIN;}

m_start 做了什么？

static void *m_start(struct seq_file *m, loff_t *pos){struct proc_maps_private *priv = m->private;unsigned long last_addr = m->version;struct mm_struct *mm;struct vm_area_struct *vma, *tail_vma = NULL;loff_t l = *pos;/* Clear the per syscall fields in priv */priv->task = NULL;priv->tail_vma = NULL;/* * We remember last_addr rather than next_addr to hit with * mmap_cache most of the time. We have zero last_addr at * the beginning and also after lseek. We will have -1 last_addr * after the end of the vmas. */if (last_addr == -1UL)return NULL;priv->task = get_pid_task(priv->pid, PIDTYPE_PID); ---------->通过pid 获取到task_structif (!priv->task)return ERR_PTR(-ESRCH);mm = mm_for_maps(priv->task);------------->这个看着很关键。。。，其实就是进行了权限检测，并得到了mm指针if (!mm || IS_ERR(mm))return mm;down_read(&mm->mmap_sem);tail_vma = get_gate_vma(priv->task->mm); ---------->获取vma的结束位置 priv->tail_vma = tail_vma;/* Start with last addr hint */vma = find_vma(mm, last_addr);-------------->从红黑树中得到对应的虚拟地址区域if (last_addr && vma) {vma = vma->vm_next;goto out;}/* * Check the vma index is within the range and do * sequential scan until m_index. */vma = NULL;if ((unsigned long)l < mm->map_count) {vma = mm->mmap;while (l-- && vma)vma = vma->vm_next;goto out;}if (l != mm->map_count)tail_vma = NULL; /* After gate vma */out:if (vma)return vma;/* End of vmas has been reached */m->version = (tail_vma != NULL)? 0: -1UL;up_read(&mm->mmap_sem);mmput(mm); -------------->释放对mm的使用记录return tail_vma;}


struct mm_struct *mm_for_maps(struct task_struct *task){return mm_access(task, PTRACE_MODE_READ);------------>看着像是ptrace实现的额？}

static struct mm_struct *mm_access(struct task_struct *task, unsigned int mode){struct mm_struct *mm;int err;err =  mutex_lock_killable(&task->signal->cred_guard_mutex);if (err)return ERR_PTR(err);mm = get_task_mm(task); -------------->通过task_struct 获取mm_struct结构，并且增加对mm_struct 使用的计数if (mm && mm != current->mm &&!ptrace_may_access(task, mode) && --------------->对进程进行跟踪，这里会进行严格的权限检测!capable(CAP_SYS_RESOURCE)) {mmput(mm);mm = ERR_PTR(-EACCES);}mutex_unlock(&task->signal->cred_guard_mutex);return mm;}

总结m_start 所做的事情，也就是说traverse找到了对应的vm_area_struct
pid-->task_struct->mm_struct->vm_area_struct

接下来就要调用show_map
static int show_map(struct seq_file *m, void *v){struct vm_area_struct *vma = v;struct proc_maps_private *priv = m->private;struct task_struct *task = priv->task;show_map_vma(m, vma);-------->显示vma 区域if (m->count < m->size)  /* vma is copied successfully */m->version = (vma != get_gate_vma(task->mm))? vma->vm_start : 0;return 0;}

static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma){struct mm_struct *mm = vma->vm_mm;struct file *file = vma->vm_file;vm_flags_t flags = vma->vm_flags;unsigned long ino = 0;unsigned long long pgoff = 0;unsigned long start, end;dev_t dev = 0;int len;if (file) {struct inode *inode = vma->vm_file->f_path.dentry->d_inode;dev = inode->i_sb->s_dev;ino = inode->i_ino;pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;}/* We don't show the stack guard page in /proc/maps */start = vma->vm_start;if (stack_guard_page_start(vma, start)) -------->可以查看到该区域的增长是向下，还是向上的...start += PAGE_SIZE;end = vma->vm_end;if (stack_guard_page_end(vma, end))end -= PAGE_SIZE;seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",start,end,flags & VM_READ ? 'r' : '-',flags & VM_WRITE ? 'w' : '-',flags & VM_EXEC ? 'x' : '-',flags & VM_MAYSHARE ? 's' : 'p',pgoff,MAJOR(dev), MINOR(dev), ino, &len);------------>关键的一句输出 /* * Print the dentry name for named mappings, and a * special [heap] marker for the heap: */if (file) {pad_len_spaces(m, len);seq_path(m, &file->f_path, "\n");} else {const char *name = arch_vma_name(vma);if (!name) {if (mm) {if (vma->vm_start <= mm->brk &&vma->vm_end >= mm->start_brk) { ------------>堆的区域name = "[heap]";} else if (vma->vm_start <= mm->start_stack &&   vma->vm_end >= mm->start_stack) {------------->栈的区域name = "[stack]";}} else {name = "[vdso]";}}if (name) {pad_len_spaces(m, len);seq_puts(m, name);}}seq_putc(m, '\n');}


详细看一下mm_struct的几个成员：
unsigned long total_vm, locked_vm, shared_vm, exec_vm;unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;unsigned long start_code, end_code, start_data, end_data;unsigned long start_brk, brk, start_stack;unsigned long arg_start, arg_end, env_start, env_end;unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv *//* * Special counters, in some configurations protected by the * page_table_lock, in other configurations by being atomic. */struct mm_rss_stat rss_stat;


图片源自http://blog.csdn.net/dyllove98/article/details/8917197
参考：http://blog.csdn.net/dyllove98/article/details/8917197
                                             
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/proc/N/maps 信息是如何生成的？
	  	   
/proc/maps 信息
	  	   
/proc下的statm、maps、memmap内存信息文件解析
	  	   
linux /proc/pid/maps 信息分析
	  	   
linux /proc/pid/maps 信息分析
	  	   
linux /proc/pid/maps 信息分析
	  	   
linux /proc/pid/maps 信息分析
	  	   
解读linux的/proc下的statm、maps、memmap 内存信息文件分析
	  	   
简单解读linux的/proc下的statm、maps、memmap 内存信息文件分析
	  	   
简单解读linux的/proc下的statm、maps、memmap 内存信息文件分析
	  	   
/proc/maps
	  	   
进程内存信息 /proc/[pid]/maps /proc/[pid]/smaps /proc/[pid]/status
	  	   
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cat proc/version在内核中是如何实现的？
	  	   
cat proc/version在内核中是如何实现的？
	  	   
cat proc/version在内核中是如何实现的？
	  	   
cat proc/version在内核中是如何实现的？
	  	   
如何验证linux进程打开文件数的默认最大值（通常是1024）？  知识点： ulimit; watch -n 1 'ls -l /proc/xxx/fd | wc -l'
	     		  
	  	   
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Cookie、Session浅析
	  	   
Javascript高级程序设计——8.时间与日期
	  	   
/proc/N/maps 信息是如何生成的？
	  	   
SpringMVC小结2
	  	   
Reverse Integer
	  	   
VS2013/MFC编程入门之十四（对话框：一般属性页对话框的创建及显示）
	  	   
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Python模块学习：threading 多线程控制和处理
	  	   
C语言小游戏“扫雷”
	  	   
Fibonacci数列
	  	   
科技英语/专业英语——改错总结【1】