GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 2.1AS(Slurm) |
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getrlimit(2) |
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getrlimit, getrusage, setrlimit − get/set resource limits and usage
#include
<sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
int
getrlimit (int resource, struct rlimit
*rlim);
int getrusage (int who, struct rusage
*usage);
int setrlimit (int resource, const struct
rlimit *rlim);
getrlimit and setrlimit get and set resource limits respectively. resource should be one of:
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RLIMIT_CPU |
/* CPU time in seconds */ | ||||
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RLIMIT_FSIZE |
/* Maximum filesize */ | ||||
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RLIMIT_DATA |
/* max data size */ | ||||
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RLIMIT_STACK |
/* max stack size */ | ||||
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RLIMIT_CORE |
/* max core file size */ | ||||
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RLIMIT_RSS |
/* max resident set size */ | ||||
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RLIMIT_NPROC |
/* max number of processes */ | ||||
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RLIMIT_NOFILE |
/* max number of open files */ | ||||
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RLIMIT_MEMLOCK |
/* max locked-in-memory address space*/ | ||||
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RLIMIT_AS |
/* address space (virtual memory) limit */ |
A resource may unlimited if you set the limit to RLIM_INFINITY. RLIMIT_OFILE is the BSD name for RLIMIT_NOFILE.
The rlimit structure is defined as follows :
struct rlimit {
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rlim_t |
rlim_cur; | |||
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rlim_t |
rlim_max; |
};
getrusage returns the current resource usages, for a who of either RUSAGE_SELF or RUSAGE_CHILDREN.
struct rusage {
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struct timeval ru_utime; |
/* user time used */ | ||||||
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struct timeval ru_stime; |
/* system time used */ | ||||||
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long |
ru_maxrss; |
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/* maximum resident set size */ | |||||||
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long |
ru_ixrss; |
/* integral shared memory size */ | |||||
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long |
ru_idrss; |
/* integral unshared data size */ | |||||
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long |
ru_isrss; |
/* integral unshared stack size */ | |||||
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long |
ru_minflt; |
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/* page reclaims */ | |||||||
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long |
ru_majflt; |
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/* page faults */ | |||||||
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long |
ru_nswap; |
/* swaps */ | |||||
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long |
ru_inblock; |
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/* block input operations */ | |||||||
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long |
ru_oublock; |
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/* block output operations */ | |||||||
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long |
ru_msgsnd; |
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/* messages sent */ | |||||||
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long |
ru_msgrcv; |
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/* messages received */ | |||||||
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long |
ru_nsignals; |
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/* signals received */ | |||||||
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long |
ru_nvcsw; |
/* voluntary context switches */ | |||||
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long |
ru_nivcsw; |
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/* involuntary context switches */ |
};
On success, zero is returned. On error, −1 is returned, and errno is set appropriately.
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EFAULT |
rlim or usage points outside the accessible address space. | ||
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EINVAL |
getrlimit or setrlimit is called with a bad resource, or getrusage is called with a bad who. | ||
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EPERM |
A non-superuser tries to use setrlimit() to increase the soft or hard limit above the current hard limit, or a superuser tries to increase RLIMIT_NOFILE above the current kernel maximum. |
SVr4, BSD 4.3
Including <sys/time.h> is not required these days, but increases portability. (Indeed, struct timeval is defined in <sys/time.h>.)
The above struct was taken from BSD 4.3 Reno. Not all fields are meaningful under Linux. Right now (Linux 2.4) only the fields ru_utime, ru_stime, ru_minflt, ru_majflt, and ru_nswap are maintained.
quotactl(2), ulimit(3)
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getrlimit(2) | |