[Python-Dev] Help with inotify (original) (raw)

Neal Becker ndbecker2 at gmail.com
Thu Oct 27 21:17:29 CEST 2005

"Martin v. Löwis" wrote:

Neal Becker wrote:

Yes, tried that- learned nothing. Please go back further in the trace file. There must be a return value of -1 (EISDIR) somewhere in the file, try to locate that.

Here's strace. The write of '4' is where my code writes the value of fileno() to stdout, which is '4', which is correct - notice that open("test-inotify.py") returned '3': The fragment you quote only refers to the part where it tries to format the traceback. The value '4' is never written, instead, it writes 4 spaces (the second argument is the bytes, the third is the number of bytes). This 1st line is the syscall for inotify:

SYS_253(0, 0x7fffff88f0f0, 0x2aaaadda3f00, 0x2aaaaab4611b, 0x7) = 4 close(3) = 0 futex(0x502530, FUTEX_WAKE, 1) = 0 futex(0x502530, FUTEX_WAKE, 1) = 0 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 3), ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaaadc12000 write(1, "4\n", 2) = 2 fcntl(4, F_GETFL) = 0 (flags O_RDONLY) fstat(4, {st_mode=S_IFDIR|0600, st_size=0, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaaadc13000 lseek(4, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek) fstat(4, {st_mode=S_IFDIR|0600, st_size=0, ...}) = 0 close(4) = 0 munmap(0x2aaaadc13000, 4096) = 0 write(2, "Traceback (most recent call last"..., 35) = 35 open("test-inotify.py", O_RDONLY) = 3 write(2, " File "test-inotify.py", line 6"..., 39) = 39 ...

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