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php proc_open file descriptor in bash command


php proc_open file descriptor in bash command

By : Osaka Javed
Date : November 29 2020, 09:01 AM
I wish this help you When we use proc_open in PHP: , @Etan Reisner, you are right, when I change to bash, it runs well.
code :
$cmd = 'bash -c "cat <(ls)"';


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How to use a variable to indicate a file descriptor in bash?

How to use a variable to indicate a file descriptor in bash?


By : user3821604
Date : March 29 2020, 07:55 AM
may help you . I want to use a bash variable to indicate a file descriptor, like this: , You have to use eval and put the entire expression in quotes.
code :
eval "exec $id<>$file"
proc_open: Extending file descriptor numbers to enable "status" feedback from a Perl script

proc_open: Extending file descriptor numbers to enable "status" feedback from a Perl script


By : RichO
Date : March 29 2020, 07:55 AM
To fix the issue you can do Say you want to monitor the progress of a hello-world program, where each step is a dot written to the designated file descriptor.
code :
#! /usr/bin/env perl

use warnings;
use strict;

die "Usage: $0 progress-fd\n" unless @ARGV == 1;

my $fd = shift;
open my $progress, ">&=", $fd or die "$0: dup $fd: $!";

# disable buffering on both handles
for ($progress, *STDOUT) {
  select $_;
  $| = 1;
}

my $output = "Hello, world!\n";

while ($output =~ s/^(.)(.*)\z/$2/s) {
  my $next = $1;
  print $next;
  print $progress ".";
  sleep 1;
}
$ (exec 3>/tmp/progress; ./hello-world 3)
Hello, world!

$ cat /tmp/progress
..............
$ (exec 17>/dev/null; exec 17>&2; ./hello-world 17)
H.e.l.l.o.,. .w.o.r.l.d.!.
.
$ (exec 17>&2; ./hello-world 17)
$ ./hello-world 333
./hello-world: dup 333: Bad file descriptor at ./hello-world line 9.
Bash, overwrite using file descriptor?

Bash, overwrite using file descriptor?


By : Nick 'Brock' Brock
Date : March 29 2020, 07:55 AM
Hope that helps That's correct. The mode in which a file is opened is determined when the shell calls open(2). When you DUP2 an FD (in any language), the flags that were set when the file was opened are shared between open FDs. In your case, O_TRUNC can only be specified when the file is actually opened.
The important thing to know is that the mode and various flags are determined only when the file is opened using file, or similar. Copying a FD with the & modifier essentially creates an "alias" that points to the original FD, and retains all the same state as the original. Truncating the file requires re-opening it.
code :
lsfd() {
    local ofd=${ofd:-2} target=${target:-$BASHPID}

    while [[ $1 == -* ]]; do
        if [[ -z $2 || $2 == *[![:digit:]]* ]]; then
            cat
            return 1
        fi
        case ${1##+(-)} in
            u)
                shift
                ofd=$1
                shift
                ;;
            t)
                shift
                target=$1
                shift
                ;;
            h|\?|help)
                cat
                return
        esac
    done <<EOF
USAGE: ${FUNCNAME} [-h|-?|--help] [-u <fd>] [ -t <PID> ] [<fd1> <fd2> <fd3>...]

This is a small lsof wrapper which displays the open
file descriptors of the current BASHPID. If no FDs are given,
the default FDs to display are {0..20}. ofd can also be set in the
environment.

    -u <fd>: Use fd for output. Defaults to stderr. Overrides ofd set in the environment.
    -t <PID>: Use PID instead of BASHPID. Overrides "target" set in the environment.
EOF

    IFS=, local -a 'fds=('"${*:-{0..20\}}"')' 'fds=("${fds[*]}")'
    lsof -a -p $target -d "$fds" +f g -- >&${ofd}
}
 $ ( { lsfd 3; cat <&3; } {savefd}<&0 <<<'hi' 3>&0- <&"${savefd}" )
COMMAND PID  USER   FD   TYPE FILE-FLAG DEVICE SIZE/OFF     NODE NAME
bash    920 ormaaj   3r   REG        LG   0,22        3 59975426 /tmp/sh-thd-8305926351 (deleted)
hi
$ ( {
cat <&4 >/dev/null; lsfd 3 4; echo there >&4; cat </dev/fd/3
} {savefd}<&0 <<<'hi' 3>&0- 4<>/dev/fd/3 <&"${savefd}"
)
COMMAND  PID  USER   FD   TYPE FILE-FLAG DEVICE SIZE/OFF     NODE NAME
bash    2410 ormaaj   3r   REG        LG   0,22        3 59996561 /tmp/sh-thd-8305914274 (deleted)
bash    2410 ormaaj   4u   REG     RW,LG   0,22        3 59996561 /tmp/sh-thd-8305914274 (deleted)
hi
there
$ { echo 'Hello world'; echo 'hi' >/dev/fd/1; } >hosts; cat hosts
hi
bash file descriptor redirection

bash file descriptor redirection


By : Ajaya Pasayat AJ
Date : March 29 2020, 07:55 AM
help you fix your problem Redirections happen in order.
Once you run 1>&2 you've replaced fd 1 with fd 2.
code :
bash ./one.bash 5>&1 1>&2
php proc_open how to detect that the command is completed / proc_open() expects at least 3 parameters

php proc_open how to detect that the command is completed / proc_open() expects at least 3 parameters


By : Dim Jim Pim
Date : March 29 2020, 07:55 AM
will be helpful for those in need In this order, the variable $isMp4stillcompressing will be set once outside the while loop, and remain true forever inside the loop. It needs to be checked each time the loop runs:
code :
$isMp4stillcompressing  = proc_get_status( $openMp4 );

while ( $isMp4stillcompressing['running'] ) {
    echo '• ';
    $isMp4stillcompressing  = proc_get_status( $openMp4 );
}
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