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回复 6# Godbach
没看到打开file文件的操作,不太明白是怎么把内容写入file中的?
- [root@centos6 ~]# strace echo 0 > file
- execve("/bin/echo", ["echo", "0"], [/* 23 vars */]) = 0
- brk(0) = 0xdb5000
- mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8995bb9000
- access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
- open("/etc/ld.so.cache", O_RDONLY) = 3
- fstat(3, {st_mode=S_IFREG|0644, st_size=17666, ...}) = 0
- mmap(NULL, 17666, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f8995bb4000
- close(3) = 0
- open("/lib64/libc.so.6", O_RDONLY) = 3
- read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\356\1\0\0\0\0\0"..., 832) = 832
- fstat(3, {st_mode=S_IFREG|0755, st_size=1921216, ...}) = 0
- mmap(NULL, 3750152, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f8995607000
- mprotect(0x7f8995792000, 2093056, PROT_NONE) = 0
- mmap(0x7f8995991000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18a000) = 0x7f8995991000
- mmap(0x7f8995996000, 18696, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f8995996000
- close(3) = 0
- mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8995bb3000
- mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8995bb2000
- mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8995bb1000
- arch_prctl(ARCH_SET_FS, 0x7f8995bb2700) = 0
- mprotect(0x7f8995991000, 16384, PROT_READ) = 0
- mprotect(0x7f8995bba000, 4096, PROT_READ) = 0
- munmap(0x7f8995bb4000, 17666) = 0
- brk(0) = 0xdb5000
- brk(0xdd6000) = 0xdd6000
- open("/usr/lib/locale/locale-archive", O_RDONLY) = 3
- fstat(3, {st_mode=S_IFREG|0644, st_size=99158576, ...}) = 0
- mmap(NULL, 99158576, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f898f776000
- close(3) = 0
- fstat(1, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
- mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f8995bb8000
- write(1, "0\n", 2) = 2
- close(1) = 0
- munmap(0x7f8995bb8000, 4096) = 0
- close(2) = 0
- exit_group(0) = ?
复制代码
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