Ls Write Error Bad File Descriptor
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Dup2 Bad File Descriptor C
Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. cat standard output bad file descriptor Join them; it only takes a minute: Sign up Bad file descriptor error when implementing piping in C up vote 2 down vote favorite 1 I am trying to implement a sample shell like program which executes the command ls | wc Using pipes to implement the command. When I execute the command I get the following error. wc: bad file descriptor bash script standard input: Bad file descriptor 0 0 0 wc: -: Bad file descriptor Please take a look at the code and provide inputs Note: 1) parse is a library which takes in the input typed and returns each command as a linked list with args and necesary data. Parse is working fine 2) I am executing each command in a different subprocess hence the fork #include
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Stat Failed: -: Bad File Descriptor
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Cat Bad File Descriptor
Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up error in http://stackoverflow.com/questions/26328010/bad-file-descriptor-error-when-implementing-piping-in-c pipe implementation , i am facing this error, ls: write error: Bad file descriptor up vote 0 down vote favorite I made this while implementing shell in c,but though while implementing pipes , i came up with this error ls:write error :Bad file descriptor ,and i am not understanding why this error is coming up, Please help. #include PG P E B Consultant 3 you meant to capture the standard-error output of the inner command: $ ash -x -c '(eval "echo foo >&2") 2>stderr' $ cat stderr + eval echo foo >&2 + echo foo foo $ bash -x -c '(eval "echo foo >&2") 2>stderr' $ cat stderr + eval 'echo foo >&2' ++ echo foo foo $ zsh -x -c '(eval "echo foo >&2") 2>stderr' # Traces on startup files deleted here. $ cat stderr +zsh:1> eval echo foo >&2 +zsh:1> echo foo foo One workaround is to grep out uninteresting lines, hoping not to remove good ones. If you intend to redirect both standard error and standard output, redirect standard output first. This works better with HP-UX, since its shell mishandles tracing if standard error is redirected first: $ sh -x -c ': 2>err >out' + : + 2> err $ cat err 1> out Don't try to redirect the standard error of a command substitution. It must be done inside the command substitution. When running ‘: `cd /zorglub` 2>/dev/null’ expect the error message to escape, while ‘: `cd /zorglub 2>/dev/null`’ works properly. On the other hand, some shells, such as Solaris or FreeBSD /bin/sh, warn about missing programs before performing redirections. Therefore, to silently check whether a program exists, it is necessary to perform redirections on a subshell: $ /bin/sh -c 'nosuch 2>/dev/null' nosuch: not found $ /bin/sh -c '(nosuch) 2>/dev/null' $ bash -c 'nosuch 2>/dev/null' FreeBSD 6.2 sh may mix the trace output lines from the statements in a shell pipeline. It is worth noting that Zsh (but not Ash nor Bash) makes it possible in assignments though: ‘foo=`cd /zorglub` 2>/dev/null’. Some shells, like ash, don't recognize bi-directional redirection (‘<>’). And even on shells that recognize it, it is not portable to use on fifos: Posix does not require read-write support for named pipes, and Cygwin does not support it: $ mkfifo fifo $ exec 5<>fifo $ echo hi >&5 bash: echo: write error: Communication error on send When catering to old systems, don't redirect the same file descriptor several times, as you are doomed to failure under Ultrix. ULTRI