コピペ: プロセスリストを終了時に調べるために、Ｃ言語で

形式

C

投稿日時

2014-08-17 00:47

公開期間

無期限

 /* findps.c,
 // a Q&D program to repeatedly look for something in the output of ps wwaux.
 // Written by and copyright Joel Rees, Amagasaki, Japan, August 2014.
 //
 // Permission to use granted if the following three conditions are all met:
 // Don't try to steal my copyrights.
 // Don't blame me if it gets stuck or goes boom.
 // Do use it for good purposes, by your definition of good.
 */
 
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <unistd.h>
 
 /*
 # Compile it like this:
 
 cc -Wall -o findps findps.c
 
 # ----------
 # Test it like this:
 
 ./findps nobody
 
 # ----------
 # Install it something like this:
 
 chmod o-rwx findps
 sudo cp -i findps /usr/local/bin/
 sudo chown root:root /usr/local/bin/findps
 sudo touch /var/log/foundps.log
 
 # To catch the culprit running as nobody 
 # and holding up your shutdown processes, 
 # call it in your shutdown script something like this:
 
 findps nobody 100 > /var/log/foundps.log &
 
 # See also
 man ps
 # and look for where to find the numeric process id.
 # If it gets out of control,
 # getting another terminal session should help. Then
 man kill
 # Also, the return key and 
 # ctrl-s
 # may be useful. But
 # ctrl-z
 # might not be so useful. But 
 man bg 
 # anyway. Or, I mean, 
 man sh
 # and remember to search with the "/" command:
 # /bg
 # /job
 # and so forth.
 
 # An equivalent shell script, without parameter checks, etc. might look like this:
 # ------------
 #! /bin/bash
 lim=$2
 for (( ct = 0; ct < lim; ++ct )) ; do ps wwaux | grep $1; sleep 1; done
 # ------------
 */
 
 
 #define BIGCOMMANDSZ 1024
 
 
 int main( int argc, char * argv[] )
 {
         char cmdbuff[ BIGCOMMANDSZ + 1];
         int limit = 10; /* Maximum times through the loop. */
 
         if ( argc < 2 )
         {       fprintf( stderr, "Usage: %s <search-term> [<limit-count>]\n", argv[ 0 ] );
                 fprintf( stderr, "\tDefault limit count is %d\n", limit );
                 return EXIT_FAILURE;
         }
         if ( argc > 2 )
         {       limit = (int) strtol( argv[ 2 ], NULL, 10 );
         }
         cmdbuff[ BIGCOMMANDSZ ] = '\0';
         strncpy( cmdbuff, "ps wwaux | grep ", BIGCOMMANDSZ );
         strncat( cmdbuff, argv[ 1 ], BIGCOMMANDSZ );
         for ( ;limit > 0; --limit )
         {       system( cmdbuff );
                 sleep( 1 );     /* So it doesn't run away too fast. */
         }
         return EXIT_SUCCESS;
 }