mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-30 14:24:35 +08:00
517 lines
8.6 KiB
C
517 lines
8.6 KiB
C
/** \file builtin_ulimit.c Functions defining the ulimit builtin
|
||
|
||
Functions used for implementing the ulimit builtin.
|
||
|
||
*/
|
||
#include "config.h"
|
||
|
||
#include <stdlib.h>
|
||
#include <stdio.h>
|
||
#include <wchar.h>
|
||
#include <wctype.h>
|
||
#include <sys/time.h>
|
||
#include <sys/resource.h>
|
||
#include <unistd.h>
|
||
#include <errno.h>
|
||
|
||
#include "fallback.h"
|
||
#include "util.h"
|
||
|
||
#include "builtin.h"
|
||
#include "common.h"
|
||
#include "wgetopt.h"
|
||
|
||
|
||
/**
|
||
Struct describing a resource limit
|
||
*/
|
||
struct resource_t
|
||
{
|
||
/**
|
||
Resource id
|
||
*/
|
||
int resource;
|
||
/**
|
||
Description of resource
|
||
*/
|
||
const wchar_t *desc;
|
||
/**
|
||
Switch used on commandline to specify resource
|
||
*/
|
||
wchar_t switch_char;
|
||
/**
|
||
The implicit multiplier used when setting getting values
|
||
*/
|
||
int multiplier;
|
||
}
|
||
;
|
||
|
||
/**
|
||
Array of resource_t structs, describing all known resource types.
|
||
*/
|
||
const static struct resource_t resource_arr[] =
|
||
{
|
||
{
|
||
RLIMIT_CORE, L"Maximum size of core files created", L'c', 1024
|
||
}
|
||
,
|
||
{
|
||
RLIMIT_DATA, L"Maximum size of a process’s data segment", L'd', 1024
|
||
}
|
||
,
|
||
{
|
||
RLIMIT_FSIZE, L"Maximum size of files created by the shell", L'f', 1024
|
||
}
|
||
,
|
||
#ifdef RLIMIT_MEMLOCK
|
||
{
|
||
RLIMIT_MEMLOCK, L"Maximum size that may be locked into memory", L'l', 1024
|
||
}
|
||
,
|
||
#endif
|
||
#ifdef RLIMIT_RSS
|
||
{
|
||
RLIMIT_RSS, L"Maximum resident set size", L'm', 1024
|
||
}
|
||
,
|
||
#endif
|
||
{
|
||
RLIMIT_NOFILE, L"Maximum number of open file descriptors", L'n', 1
|
||
}
|
||
,
|
||
{
|
||
RLIMIT_STACK, L"Maximum stack size", L's', 1024
|
||
}
|
||
,
|
||
{
|
||
RLIMIT_CPU, L"Maximum amount of cpu time in seconds", L't', 1
|
||
}
|
||
,
|
||
#ifdef RLIMIT_NPROC
|
||
{
|
||
RLIMIT_NPROC, L"Maximum number of processes available to a single user", L'u', 1
|
||
}
|
||
,
|
||
#endif
|
||
#ifdef RLIMIT_AS
|
||
{
|
||
RLIMIT_AS, L"Maximum amount of virtual memory available to the shell", L'v', 1024
|
||
}
|
||
,
|
||
#endif
|
||
{
|
||
0, 0, 0, 0
|
||
}
|
||
}
|
||
;
|
||
|
||
/**
|
||
Get the implicit multiplication factor for the specified resource limit
|
||
*/
|
||
static int get_multiplier( int what )
|
||
{
|
||
int i;
|
||
|
||
for( i=0; resource_arr[i].desc; i++ )
|
||
{
|
||
if( resource_arr[i].resource == what )
|
||
{
|
||
return resource_arr[i].multiplier;
|
||
}
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
/**
|
||
Return the value for the specified resource limit. This function
|
||
does _not_ multiply the limit value by the multiplier constant used
|
||
by the commandline ulimit.
|
||
*/
|
||
static rlim_t get( int resource, int hard )
|
||
{
|
||
struct rlimit ls;
|
||
|
||
getrlimit( resource, &ls );
|
||
|
||
return hard ? ls.rlim_max:ls.rlim_cur;
|
||
}
|
||
|
||
/**
|
||
Print the value of the specified resource limit
|
||
*/
|
||
static void print( int resource, int hard )
|
||
{
|
||
rlim_t l = get( resource, hard );
|
||
|
||
if( l == RLIM_INFINITY )
|
||
sb_append( sb_out, L"unlimited\n" );
|
||
else
|
||
sb_printf( sb_out, L"%d\n", l / get_multiplier( resource ) );
|
||
|
||
}
|
||
|
||
/**
|
||
Print values of all resource limits
|
||
*/
|
||
static void print_all( int hard )
|
||
{
|
||
int i;
|
||
int w=0;
|
||
|
||
for( i=0; resource_arr[i].desc; i++ )
|
||
{
|
||
w=maxi( w, my_wcswidth(resource_arr[i].desc));
|
||
}
|
||
|
||
for( i=0; resource_arr[i].desc; i++ )
|
||
{
|
||
struct rlimit ls;
|
||
rlim_t l;
|
||
getrlimit( resource_arr[i].resource, &ls );
|
||
l = hard ? ls.rlim_max:ls.rlim_cur;
|
||
|
||
wchar_t *unit = ((resource_arr[i].resource==RLIMIT_CPU)?L"(seconds, ":(get_multiplier(resource_arr[i].resource)==1?L"(":L"(kB, "));
|
||
|
||
sb_printf( sb_out,
|
||
L"%-*ls %10ls-%lc) ",
|
||
w,
|
||
resource_arr[i].desc,
|
||
unit,
|
||
resource_arr[i].switch_char);
|
||
|
||
if( l == RLIM_INFINITY )
|
||
{
|
||
sb_append( sb_out, L"unlimited\n" );
|
||
}
|
||
else
|
||
{
|
||
sb_printf( sb_out, L"%d\n", l/get_multiplier(resource_arr[i].resource) );
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
/**
|
||
Returns the description for the specified resource limit
|
||
*/
|
||
static const wchar_t *get_desc( int what )
|
||
{
|
||
int i;
|
||
|
||
for( i=0; resource_arr[i].desc; i++ )
|
||
{
|
||
if( resource_arr[i].resource == what )
|
||
{
|
||
return resource_arr[i].desc;
|
||
}
|
||
}
|
||
return L"Not a resource";
|
||
}
|
||
|
||
/**
|
||
Set the new value of the specified resource limit. This function
|
||
does _not_ multiply the limit value by the multiplier constant used
|
||
by the commandline ulimit.
|
||
*/
|
||
static int set( int resource, int hard, int soft, rlim_t value )
|
||
{
|
||
struct rlimit ls;
|
||
getrlimit( resource, &ls );
|
||
|
||
if( hard )
|
||
{
|
||
ls.rlim_max = value;
|
||
}
|
||
|
||
if( soft )
|
||
{
|
||
ls.rlim_cur = value;
|
||
|
||
/*
|
||
Do not attempt to set the soft limit higher than the hard limit
|
||
*/
|
||
if( ( value == RLIM_INFINITY && ls.rlim_max != RLIM_INFINITY ) ||
|
||
( value != RLIM_INFINITY && ls.rlim_max != RLIM_INFINITY && value > ls.rlim_max))
|
||
{
|
||
ls.rlim_cur = ls.rlim_max;
|
||
}
|
||
}
|
||
|
||
if( setrlimit( resource, &ls ) )
|
||
{
|
||
if( errno == EPERM )
|
||
sb_printf( sb_err, L"ulimit: Permission denied when changing resource of type '%ls'\n", get_desc( resource ) );
|
||
else
|
||
builtin_wperror( L"ulimit" );
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
The ulimit builtin, used for setting resource limits. Defined in
|
||
builtin_ulimit.c.
|
||
*/
|
||
static int builtin_ulimit( wchar_t ** argv )
|
||
{
|
||
int hard=0;
|
||
int soft=0;
|
||
|
||
int what = RLIMIT_FSIZE;
|
||
int report_all = 0;
|
||
|
||
int argc = builtin_count_args( argv );
|
||
|
||
woptind=0;
|
||
|
||
while( 1 )
|
||
{
|
||
const static struct woption
|
||
long_options[] =
|
||
{
|
||
{
|
||
L"all", no_argument, 0, 'a'
|
||
}
|
||
,
|
||
{
|
||
L"hard", no_argument, 0, 'H'
|
||
}
|
||
,
|
||
{
|
||
L"soft", no_argument, 0, 'S'
|
||
}
|
||
,
|
||
{
|
||
L"core-size", no_argument, 0, 'c'
|
||
}
|
||
,
|
||
{
|
||
L"data-size", no_argument, 0, 'd'
|
||
}
|
||
,
|
||
{
|
||
L"file-size", no_argument, 0, 'f'
|
||
}
|
||
,
|
||
{
|
||
L"lock-size", no_argument, 0, 'l'
|
||
}
|
||
,
|
||
{
|
||
L"resident-set-size", no_argument, 0, 'm'
|
||
}
|
||
,
|
||
{
|
||
L"file-descriptor-count", no_argument, 0, 'n'
|
||
}
|
||
,
|
||
{
|
||
L"stack-size", no_argument, 0, 's'
|
||
}
|
||
,
|
||
{
|
||
L"cpu-time", no_argument, 0, 't'
|
||
}
|
||
,
|
||
{
|
||
L"process-count", no_argument, 0, 'u'
|
||
}
|
||
,
|
||
{
|
||
L"virtual-memory-size", no_argument, 0, 'v'
|
||
}
|
||
,
|
||
{
|
||
L"help", no_argument, 0, 'h'
|
||
}
|
||
,
|
||
{
|
||
0, 0, 0, 0
|
||
}
|
||
}
|
||
;
|
||
|
||
|
||
int opt_index = 0;
|
||
|
||
int opt = wgetopt_long( argc,
|
||
argv,
|
||
L"aHScdflmnstuvh",
|
||
long_options,
|
||
&opt_index );
|
||
if( opt == -1 )
|
||
break;
|
||
|
||
switch( opt )
|
||
{
|
||
case 0:
|
||
if(long_options[opt_index].flag != 0)
|
||
break;
|
||
sb_printf( sb_err,
|
||
BUILTIN_ERR_UNKNOWN,
|
||
argv[0],
|
||
long_options[opt_index].name );
|
||
builtin_print_help( argv[0], sb_err );
|
||
|
||
return 1;
|
||
|
||
case L'a':
|
||
report_all=1;
|
||
break;
|
||
|
||
case L'H':
|
||
hard=1;
|
||
break;
|
||
|
||
case L'S':
|
||
soft=1;
|
||
break;
|
||
|
||
case L'c':
|
||
what=RLIMIT_CORE;
|
||
break;
|
||
|
||
case L'd':
|
||
what=RLIMIT_DATA;
|
||
break;
|
||
|
||
case L'f':
|
||
what=RLIMIT_FSIZE;
|
||
break;
|
||
#ifdef RLIMIT_MEMLOCK
|
||
case L'l':
|
||
what=RLIMIT_MEMLOCK;
|
||
break;
|
||
#endif
|
||
|
||
#ifdef RLIMIT_RSS
|
||
case L'm':
|
||
what=RLIMIT_RSS;
|
||
break;
|
||
#endif
|
||
|
||
case L'n':
|
||
what=RLIMIT_NOFILE;
|
||
break;
|
||
|
||
case L's':
|
||
what=RLIMIT_STACK;
|
||
break;
|
||
|
||
case L't':
|
||
what=RLIMIT_CPU;
|
||
break;
|
||
|
||
#ifdef RLIMIT_NPROC
|
||
case L'u':
|
||
what=RLIMIT_NPROC;
|
||
break;
|
||
#endif
|
||
|
||
#ifdef RLIMIT_AS
|
||
case L'v':
|
||
what=RLIMIT_AS;
|
||
break;
|
||
#endif
|
||
|
||
case L'h':
|
||
builtin_print_help( argv[0], sb_out );
|
||
return 0;
|
||
|
||
case L'?':
|
||
builtin_print_help( argv[0], sb_err );
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
if( report_all )
|
||
{
|
||
if( argc - woptind == 0 )
|
||
{
|
||
print_all( hard );
|
||
}
|
||
else
|
||
{
|
||
sb_append2( sb_err,
|
||
argv[0],
|
||
L": Too many arguments\n",
|
||
(void *)0 );
|
||
builtin_print_help( argv[0], sb_err );
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
switch( argc - woptind )
|
||
{
|
||
case 0:
|
||
{
|
||
/*
|
||
Show current limit value
|
||
*/
|
||
print( what, hard );
|
||
break;
|
||
}
|
||
|
||
case 1:
|
||
{
|
||
/*
|
||
Change current limit value
|
||
*/
|
||
rlim_t new_limit;
|
||
wchar_t *end;
|
||
|
||
/*
|
||
Set both hard and soft limits if nothing else was specified
|
||
*/
|
||
if( !(hard+soft) )
|
||
{
|
||
hard=soft=1;
|
||
}
|
||
|
||
if( wcscasecmp( argv[woptind], L"unlimited" )==0)
|
||
{
|
||
new_limit = RLIM_INFINITY;
|
||
}
|
||
else if( wcscasecmp( argv[woptind], L"hard" )==0)
|
||
{
|
||
new_limit = get( what, 1 );
|
||
}
|
||
else if( wcscasecmp( argv[woptind], L"soft" )==0)
|
||
{
|
||
new_limit = get( what, soft );
|
||
}
|
||
else
|
||
{
|
||
errno=0;
|
||
new_limit = wcstol( argv[woptind], &end, 10 );
|
||
if( errno || *end )
|
||
{
|
||
sb_printf( sb_err,
|
||
L"%ls: Invalid limit '%ls'\n",
|
||
argv[0],
|
||
argv[woptind] );
|
||
builtin_print_help( argv[0], sb_err );
|
||
return 1;
|
||
}
|
||
new_limit *= get_multiplier( what );
|
||
}
|
||
|
||
return set( what, hard, soft, new_limit );
|
||
}
|
||
|
||
default:
|
||
{
|
||
sb_append2( sb_err,
|
||
argv[0],
|
||
L": Too many arguments\n",
|
||
(void *)0 );
|
||
builtin_print_help( argv[0], sb_err );
|
||
return 1;
|
||
}
|
||
|
||
}
|
||
return 0;
|
||
}
|