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    SubjectProblem: cat < /dev/my_ttyS0 is not blocked
    Hi,

    I have a problem with cat < /dev/my_ttyS0 (see strace output below). cat function is not blocked. I don't understand why it is not stopped at read(0, __ and terminated?
    Thank you

    ------------------------------------------------------------------------------
    execve("/bin/cat", ["cat"], [/* 12 vars */]) = 0
    brk(0) = 0x7d000
    open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or
    directory)
    open("/etc/ld.so.cache", O_RDONLY) = 3
    fstat64(3, {st_mode=S_IFREG|0644, st_size=5664, ...}) = 0
    old_mmap(NULL, 5664, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40017000
    close(3) = 0
    open("/lib/libm.so.6", O_RDONLY) = 3
    read(3, "\177ELF\1\1\1a\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\250B\0\000"..., 512) =
    512
    fstat64(3, {st_mode=S_IFREG|0755, st_size=480324, ...}) = 0
    old_mmap(NULL, 506412, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40020000
    mprotect(0x40093000, 35372, PROT_NONE) = 0
    old_mmap(0x40098000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
    0x70000) = 0x40098000
    close(3) = 0
    open("/lib/libcrypt.so.1", O_RDONLY) = 3
    read(3, "\177ELF\1\1\1a\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\260\10\0"..., 512) =
    512
    fstat64(3, {st_mode=S_IFREG|0755, st_size=19940, ...}) = 0
    old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
    0x40019000
    old_mmap(NULL, 211220, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4009c000
    mprotect(0x400a1000, 190740, PROT_NONE) = 0
    old_mmap(0x400a4000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0)
    = 0x400a4000
    old_mmap(0x400a9000, 157972, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
    MAP_ANONYMOUS, -1, 0) = 0x400a9000
    close(3) = 0
    open("/lib/libc.so.6", O_RDONLY) = 3
    read(3, "\177ELF\1\1\1a\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\330p\1\000"..., 512) =
    512
    fstat64(3, {st_mode=S_IFREG|0755, st_size=1240024, ...}) = 0
    old_mmap(NULL, 1257088, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x400d0000
    mprotect(0x401f5000, 56960, PROT_NONE) = 0
    old_mmap(0x401f8000, 36864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
    0x120000) = 0x401f8000
    old_mmap(0x40201000, 7808, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
    MAP_ANONYMOUS, -1, 0) = 0x40201000
    close(3) = 0
    munmap(0x40017000, 5664) = 0
    getuid32() = 0
    getgid32() = 0
    setgid32(0) = 0
    setuid32(0) = 0
    read(0, "", 8192) = 0
    io_submit(0, 0x40200164, 0 <unfinished ... exit status 0>
    Process 1653 detached
    -
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