sys/resource.h - definitions for XSI resource operations
[XSI] #include <sys/resource.h>
The <sys/resource.h> header shall define the following symbolic constants as possible values of the which argument of getpriority() and setpriority():
- Identifies the who argument as a process ID.
- Identifies the who argument as a process group ID.
- Identifies the who argument as a user ID.
The following type shall be defined through typedef:
- Unsigned integer type used for limit values.
The following symbolic constants shall be defined:
- A value of rlim_t indicating no limit.
- A value of type rlim_t indicating an unrepresentable saved hard limit.
- A value of type rlim_t indicating an unrepresentable saved soft limit.
On implementations where all resource limits are representable in an object of type rlim_t, RLIM_SAVED_MAX and RLIM_SAVED_CUR need not be distinct from RLIM_INFINITY.
The following symbolic constants shall be defined as possible values of the who parameter of getrusage():
- Returns information about the current process.
- Returns information about children of the current process.
The <sys/resource.h> header shall define the rlimit structure that includes at least the following members:rlim_t rlim_cur The current (soft) limit. rlim_t rlim_max The hard limit.
The <sys/resource.h> header shall define the rusage structure that includes at least the following members:struct timeval ru_utime User time used. struct timeval ru_stime System time used.
The timeval structure shall be defined as described in <sys/time.h>.
The following symbolic constants shall be defined as possible values for the resource argument of getrlimit() and setrlimit():
- Limit on size of core file.
- Limit on CPU time per process.
- Limit on data segment size.
- Limit on file size.
- Limit on number of open files.
- Limit on stack size.
- Limit on address space size.
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.int getpriority(int, id_t); int getrlimit(int, struct rlimit *); int getrusage(int, struct rusage *); int setpriority(int, id_t, int); int setrlimit(int, const struct rlimit *);
The id_t type shall be defined through typedef as described in <sys/types.h>.
Inclusion of the <sys/resource.h> header may also make visible all symbols from <sys/time.h>.
<sys/time.h>, <sys/types.h>, the System Interfaces volume of IEEE Std 1003.1-2001, getpriority(), getrusage(), getrlimit()
First released in Issue 4, Version 2.
Large File System extensions are added.