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ulimit(2) System Calls ulimit(2) NAME ulimit - get and set process limits SYNOPSIS #include <ulimit.h> long ulimit(int cmd, /* newlimit */...); DESCRIPTION The ulimit() function provides for control over process limits. It is effective in limiting the growth of regular files. Pipes are limited to PIPE_MAX bytes. The cmd values, defined in <ulimit.h>, include: UL_GETFSIZE Return the soft file size limit of the process. The limit is in units of 512-byte blocks and is inherited by child processes. Files of any size can be read. The return value is the integer part of the soft file size limit divided by 512. If the result cannot be repre- sented as a long int, the result is unspecified. UL_SETFSIZE Set the hard and soft file size limits for output oper- ations of the process to the value of the second argu- ment, taken as a long int. Any process may decrease its own hard limit, but only a process with appropriate privileges may increase the limit. The new file size limit is returned. The hard and soft file size limits are set to the specified value multiplied by 512. If the result would overflow an rlimit_t, the actual value set is unspecified. UL_GMEMLIM Get the maximum possible break value (see brk(2)). UL_GDESLIM Get the current value of the maximum number of open files per process configured in the system. RETURN VALUES Upon successful completion, ulimit() returns the value of the requested limit. Otherwise, -1 is returned, the limit is not changed, and errno is set to indicate the error. ERRORS The ulimit() function will fail if: EINVAL The cmd argument is not valid. EPERM A process that has not asserted {PRIV_SYS_RESOURCE} in its effective set is trying to increase its file size limit. USAGE Since all return values are permissible in a successful situation, an application wishing to check for error situations should set errno to 0, then call ulimit(), and if it returns -1, check if errno is non- zero. The getrlimit() and setrlimit() functions provide a more general inter- face for controlling process limits, and are preferred over ulimit(). See getrlimit(2). ATTRIBUTES See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO brk(2), getrlimit(2), write(2), attributes(5), privileges(5), stan- dards(5) SunOS 5.10 1 Feb 2003 ulimit(2)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | USAGE | ATTRIBUTES | SEE ALSO
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