mirror of
https://github.com/fish-shell/fish-shell.git
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517 lines
8.6 KiB
C
517 lines
8.6 KiB
C
/** \file builtin_ulimit.c Functions defining the ulimit builtin
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Functions used for implementing the ulimit builtin.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <wchar.h>
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#include <wctype.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <errno.h>
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#include "fallback.h"
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#include "util.h"
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#include "builtin.h"
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#include "common.h"
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#include "wgetopt.h"
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/**
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Struct describing a resource limit
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*/
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struct resource_t
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{
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/**
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Resource id
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*/
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int resource;
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/**
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Description of resource
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*/
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const wchar_t *desc;
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/**
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Switch used on commandline to specify resource
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*/
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wchar_t switch_char;
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/**
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The implicit multiplier used when setting getting values
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*/
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int multiplier;
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}
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;
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/**
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Array of resource_t structs, describing all known resource types.
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*/
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const static struct resource_t resource_arr[] =
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{
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{
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RLIMIT_CORE, L"Maximum size of core files created", L'c', 1024
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}
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,
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{
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RLIMIT_DATA, L"Maximum size of a process’s data segment", L'd', 1024
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}
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,
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{
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RLIMIT_FSIZE, L"Maximum size of files created by the shell", L'f', 1024
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}
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,
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#ifdef RLIMIT_MEMLOCK
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{
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RLIMIT_MEMLOCK, L"Maximum size that may be locked into memory", L'l', 1024
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}
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,
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#endif
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#ifdef RLIMIT_RSS
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{
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RLIMIT_RSS, L"Maximum resident set size", L'm', 1024
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}
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,
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#endif
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{
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RLIMIT_NOFILE, L"Maximum number of open file descriptors", L'n', 1
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}
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,
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{
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RLIMIT_STACK, L"Maximum stack size", L's', 1024
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}
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,
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{
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RLIMIT_CPU, L"Maximum amount of cpu time in seconds", L't', 1
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}
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,
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#ifdef RLIMIT_NPROC
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{
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RLIMIT_NPROC, L"Maximum number of processes available to a single user", L'u', 1
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}
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,
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#endif
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#ifdef RLIMIT_AS
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{
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RLIMIT_AS, L"Maximum amount of virtual memory available to the shell", L'v', 1024
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}
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,
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#endif
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{
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0, 0, 0, 0
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}
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}
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;
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/**
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Get the implicit multiplication factor for the specified resource limit
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*/
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static int get_multiplier( int what )
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{
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int i;
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for( i=0; resource_arr[i].desc; i++ )
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{
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if( resource_arr[i].resource == what )
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{
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return resource_arr[i].multiplier;
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}
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}
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return -1;
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}
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/**
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Return the value for the specified resource limit. This function
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does _not_ multiply the limit value by the multiplier constant used
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by the commandline ulimit.
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*/
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static rlim_t get( int resource, int hard )
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{
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struct rlimit ls;
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getrlimit( resource, &ls );
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return hard ? ls.rlim_max:ls.rlim_cur;
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}
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/**
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Print the value of the specified resource limit
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*/
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static void print( int resource, int hard )
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{
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rlim_t l = get( resource, hard );
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if( l == RLIM_INFINITY )
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sb_append( sb_out, L"unlimited\n" );
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else
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sb_printf( sb_out, L"%d\n", l / get_multiplier( resource ) );
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}
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/**
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Print values of all resource limits
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*/
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static void print_all( int hard )
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{
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int i;
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int w=0;
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for( i=0; resource_arr[i].desc; i++ )
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{
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w=maxi( w, my_wcswidth(resource_arr[i].desc));
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}
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for( i=0; resource_arr[i].desc; i++ )
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{
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struct rlimit ls;
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rlim_t l;
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getrlimit( resource_arr[i].resource, &ls );
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l = hard ? ls.rlim_max:ls.rlim_cur;
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wchar_t *unit = ((resource_arr[i].resource==RLIMIT_CPU)?L"(seconds, ":(get_multiplier(resource_arr[i].resource)==1?L"(":L"(kB, "));
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sb_printf( sb_out,
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L"%-*ls %10ls-%lc) ",
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w,
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resource_arr[i].desc,
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unit,
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resource_arr[i].switch_char);
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if( l == RLIM_INFINITY )
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{
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sb_append( sb_out, L"unlimited\n" );
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}
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else
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{
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sb_printf( sb_out, L"%d\n", l/get_multiplier(resource_arr[i].resource) );
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}
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}
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}
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/**
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Returns the description for the specified resource limit
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*/
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static const wchar_t *get_desc( int what )
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{
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int i;
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for( i=0; resource_arr[i].desc; i++ )
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{
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if( resource_arr[i].resource == what )
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{
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return resource_arr[i].desc;
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}
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}
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return L"Not a resource";
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}
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/**
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Set the new value of the specified resource limit. This function
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does _not_ multiply the limit value by the multiplier constant used
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by the commandline ulimit.
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*/
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static int set( int resource, int hard, int soft, rlim_t value )
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{
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struct rlimit ls;
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getrlimit( resource, &ls );
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if( hard )
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{
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ls.rlim_max = value;
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}
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if( soft )
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{
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ls.rlim_cur = value;
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/*
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Do not attempt to set the soft limit higher than the hard limit
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*/
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if( ( value == RLIM_INFINITY && ls.rlim_max != RLIM_INFINITY ) ||
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( value != RLIM_INFINITY && ls.rlim_max != RLIM_INFINITY && value > ls.rlim_max))
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{
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ls.rlim_cur = ls.rlim_max;
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}
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}
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if( setrlimit( resource, &ls ) )
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{
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if( errno == EPERM )
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sb_printf( sb_err, L"ulimit: Permission denied when changing resource of type '%ls'\n", get_desc( resource ) );
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else
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builtin_wperror( L"ulimit" );
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return 1;
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}
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return 0;
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}
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/**
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The ulimit builtin, used for setting resource limits. Defined in
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builtin_ulimit.c.
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*/
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static int builtin_ulimit( wchar_t ** argv )
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{
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int hard=0;
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int soft=0;
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int what = RLIMIT_FSIZE;
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int report_all = 0;
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int argc = builtin_count_args( argv );
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woptind=0;
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while( 1 )
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{
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const static struct woption
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long_options[] =
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{
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{
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L"all", no_argument, 0, 'a'
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}
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,
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{
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L"hard", no_argument, 0, 'H'
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}
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,
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{
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L"soft", no_argument, 0, 'S'
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}
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,
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{
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L"core-size", no_argument, 0, 'c'
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}
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,
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{
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L"data-size", no_argument, 0, 'd'
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}
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,
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{
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L"file-size", no_argument, 0, 'f'
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}
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,
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{
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L"lock-size", no_argument, 0, 'l'
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}
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,
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{
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L"resident-set-size", no_argument, 0, 'm'
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}
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,
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{
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L"file-descriptor-count", no_argument, 0, 'n'
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}
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,
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{
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L"stack-size", no_argument, 0, 's'
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}
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,
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{
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L"cpu-time", no_argument, 0, 't'
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}
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,
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{
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L"process-count", no_argument, 0, 'u'
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}
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,
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{
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L"virtual-memory-size", no_argument, 0, 'v'
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}
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,
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{
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L"help", no_argument, 0, 'h'
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}
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,
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{
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0, 0, 0, 0
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}
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}
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;
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int opt_index = 0;
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int opt = wgetopt_long( argc,
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argv,
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L"aHScdflmnstuvh",
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long_options,
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&opt_index );
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if( opt == -1 )
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break;
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switch( opt )
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{
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case 0:
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if(long_options[opt_index].flag != 0)
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break;
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sb_printf( sb_err,
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BUILTIN_ERR_UNKNOWN,
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argv[0],
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long_options[opt_index].name );
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builtin_print_help( argv[0], sb_err );
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return 1;
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case L'a':
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report_all=1;
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break;
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case L'H':
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hard=1;
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break;
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case L'S':
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soft=1;
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break;
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case L'c':
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what=RLIMIT_CORE;
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break;
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case L'd':
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what=RLIMIT_DATA;
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break;
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case L'f':
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what=RLIMIT_FSIZE;
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break;
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#ifdef RLIMIT_MEMLOCK
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case L'l':
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what=RLIMIT_MEMLOCK;
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break;
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#endif
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#ifdef RLIMIT_RSS
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case L'm':
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what=RLIMIT_RSS;
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break;
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#endif
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case L'n':
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what=RLIMIT_NOFILE;
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break;
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case L's':
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what=RLIMIT_STACK;
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break;
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case L't':
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what=RLIMIT_CPU;
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break;
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#ifdef RLIMIT_NPROC
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case L'u':
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what=RLIMIT_NPROC;
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break;
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#endif
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#ifdef RLIMIT_AS
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case L'v':
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what=RLIMIT_AS;
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break;
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#endif
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case L'h':
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builtin_print_help( argv[0], sb_out );
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return 0;
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case L'?':
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builtin_unknown_option( argv[0], argv[woptind-1] );
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return 1;
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}
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}
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if( report_all )
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{
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if( argc - woptind == 0 )
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{
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print_all( hard );
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}
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else
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{
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sb_append( sb_err,
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argv[0],
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L": Too many arguments\n",
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(void *)0 );
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builtin_print_help( argv[0], sb_err );
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return 1;
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}
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return 0;
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}
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switch( argc - woptind )
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{
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case 0:
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{
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/*
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Show current limit value
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*/
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print( what, hard );
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break;
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}
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case 1:
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{
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/*
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Change current limit value
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*/
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rlim_t new_limit;
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wchar_t *end;
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/*
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Set both hard and soft limits if nothing else was specified
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*/
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if( !(hard+soft) )
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{
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hard=soft=1;
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}
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if( wcscasecmp( argv[woptind], L"unlimited" )==0)
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{
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new_limit = RLIM_INFINITY;
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}
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else if( wcscasecmp( argv[woptind], L"hard" )==0)
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{
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new_limit = get( what, 1 );
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}
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else if( wcscasecmp( argv[woptind], L"soft" )==0)
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{
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new_limit = get( what, soft );
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}
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else
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{
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errno=0;
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new_limit = wcstol( argv[woptind], &end, 10 );
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if( errno || *end )
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{
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sb_printf( sb_err,
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L"%ls: Invalid limit '%ls'\n",
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argv[0],
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argv[woptind] );
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builtin_print_help( argv[0], sb_err );
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return 1;
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}
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new_limit *= get_multiplier( what );
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}
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return set( what, hard, soft, new_limit );
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}
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default:
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{
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sb_append( sb_err,
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argv[0],
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L": Too many arguments\n",
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(void *)0 );
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builtin_print_help( argv[0], sb_err );
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return 1;
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}
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}
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return 0;
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}
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