#include <sys/time.h> #include <sys/resource.h>
getrlimit(resource, rlp) int resource; struct rlimit *rlp;
setrlimit(resource, rlp) int resource; struct rlimit *rlp;
The resource parameter is one of the following:
A resource limit is specified as a soft limit and a hard limit. When a soft limit is exceeded a process may receive a signal (for example, if the cpu time is exceeded), but it will be allowed to continue execution until it reaches the hard limit (or modifies its resource limit). The rlimit structure is used to specify the hard and soft limits on a resource,
struct rlimit { int rlim_cur; /* current (soft) limit */ int rlim_max; /* hard limit */ };
Only the super-user may raise the maximum limits. Other users may only alter rlim_cur within the range from 0 to rlim_max or (irreversibly) lower rlim_max.
An ``infinite'' value for a limit is defined as RLIM_INFINITY (0x7fffffff).
Because this information is stored in the per-process information, this system call must be executed directly by the shell if it is to affect all future processes created by the shell; limit is thus a built-in command to csh.1
The system refuses to extend the data or stack space when the limits would be exceeded in the normal way: a break call fails if the data space limit is reached. When the stack limit is reached, the process receives a segmentation fault (SIGSEGV); if this signal is not caught by a handler using the signal stack, this signal will kill the process.
A file I/O operation that would create a file that is too large will cause a signal SIGXFSZ to be generated; this normally terminates the process, but may be caught. When the soft cpu time limit is exceeded, a signal SIGXCPU is sent to the offending process.
Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97