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Implementation of getrlimit and getdtablesize

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This commit is contained in:
Erik van der Kouwe 2009-12-07 19:56:40 +00:00
parent 26ba254a4a
commit bd0933a19b
6 changed files with 127 additions and 0 deletions
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28
include/sys/resource.h
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@ -15,4 +15,32 @@
int getpriority(int, int);
int setpriority(int, int, int);
#ifdef _POSIX_SOURCE
#include <sys/time.h>
typedef unsigned long rlim_t;
#define RLIM_INFINITY ((rlim_t) -1)
#define RLIM_SAVED_CUR RLIM_INFINITY
#define RLIM_SAVED_MAX RLIM_INFINITY
struct rlimit
{
rlim_t rlim_cur;
rlim_t rlim_max;
};
#define RLIMIT_CORE 1
#define RLIMIT_CPU 2
#define RLIMIT_DATA 3
#define RLIMIT_FSIZE 4
#define RLIMIT_NOFILE 5
#define RLIMIT_STACK 6
#define RLIMIT_AS 7
int getrlimit(int resource, struct rlimit *rlp);
#endif /* defined(_POSIX_SOURCE) */
#endif

4
include/unistd.h
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@ -216,4 +216,8 @@ _PROTOTYPE( int initgroups, (const char *name, gid_t basegid) );
#endif
#ifdef _POSIX_SOURCE
_PROTOTYPE( int getdtablesize, (void) );
#endif
#endif /* _UNISTD_H */

1
lib/other/Makefile.in
View file

@ -77,6 +77,7 @@ libc_FILES=" \
random.c \
realpath.c \
rindex.c \
rlimit.c \
setenv.c \
setgroups.c \
settimeofday.c \

55
lib/other/rlimit.c Normal file
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@ -0,0 +1,55 @@
/* getdtablesize, getrlimit Author: Erik van der Kouwe
* query resource consumtion limits 4 December 2009
*
* Based on these specifications:
* http://www.opengroup.org/onlinepubs/007908775/xsh/getdtablesize.html
* http://www.opengroup.org/onlinepubs/007908775/xsh/getrlimit.html
*/
#include <errno.h>
#include <limits.h>
#include <sys/resource.h>
#include <unistd.h>
int getdtablesize(void)
{
return OPEN_MAX;
}
int getrlimit(int resource, struct rlimit *rlp)
{
rlim_t limit;
switch (resource)
{
case RLIMIT_CORE:
/* no core currently produced */
limit = 0;
break;
case RLIMIT_CPU:
case RLIMIT_DATA:
case RLIMIT_FSIZE:
case RLIMIT_STACK:
case RLIMIT_AS:
/* no limit enforced (however architectural limits
* may apply)
*/
limit = RLIM_INFINITY;
break;
case RLIMIT_NOFILE:
limit = OPEN_MAX;
break;
default:
errno = EINVAL;
return -1;
}
/* return limit */
rlp->rlim_cur = limit;
rlp->rlim_max = limit;
return 0;
}

16
man/man3/getdtablesize.3 Normal file
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@ -0,0 +1,16 @@
.TH GETDTABLESIZE 3 "December 4, 2009"
.UC 4
.SH NAME
getdtablesize \- query maximum number of open files
.SH SYNOPSIS
.nf
.ft B
#include <unistd.h>
int getdtablesize(void);
.fi
.SH DESCRIPTION
getdtablesize returns the number of files that may be open at the same time
in a process.
.SH "RETURN VALUE
The number of files that may be open at the same time in a process is returned.

23
man/man3/getrlimit.3 Normal file
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@ -0,0 +1,23 @@
.TH GETRLIMIT 3 "December 4, 2009"
.UC 4
.SH NAME
getrlimit \- query resource consumption limits
.SH SYNOPSIS
.nf
.ft B
#include <sys/resource.h>
int getrlimit(int \fIresource\fP, struct rlimit *\fIrlp\fP);
.fi
.SH DESCRIPTION
getrlimit queries the current resource limit regarding the specified
\fIresource\fP. This can be one of the following: RLIMIT_CORE, RLIMIT_CPU,
RLIMIT_DATA, RLIMIT_FSIZE, RLIMIT_NOFILE, RLIMIT_STACK or RLIMIT_AS.
The soft limit is specified in \fIrlp\fP\->rlim_cur and the hard limit in
\fIrlp\fP\->rlim_max. On MINIX, these are currently always the same.
A value of RLIM_INFINITY specifies that no limit is enforced, although
architectural limits may still apply.
.SH "RETURN VALUE
If the function succeeds, 0 is returned.
If the function fails, -1 is returned and errno is set to indicate the
cause of the failure.