How to use option of Selected SUSv3 options? Post: 302729211

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Top Forums Programming How to use option of Selected SUSv3 options? Post 302729211 by fpmurphy on Friday 9th of November 2012 10:07:20 AM

11-09-2012

Registered User

Here is what POSIX.1 says:

Code:

If name is an invalid value, sysconf() shall return -1 and set errno to indicate the error. 
If the variable corresponding to name is described in <limits.h> as a maximum or minimum
value and the variable has no limit, sysconf() shall return -1 without changing the value 
of errno. Note that indefinite limits do not imply infinite limits; see <limits.h>.

Otherwise, sysconf() shall return the current variable value on the system. The value 
returned shall not be more restrictive than the corresponding value described to the 
application when it was compiled with the implementation's <limits.h> or <unistd.h>. The 
value shall not change during the lifetime of the calling process, [XSI] [Option Start]  
except that sysconf(_SC_OPEN_MAX) may return different values before and after a call 
to setrlimit() which changes the RLIMIT_NOFILE soft limit. [Option End]

If the variable corresponding to name is dependent on an unsupported option, the results 
are unspecified.

and here is an example:

Code:

#include <stdio.h>
#include <unistd.h>
#include <errno.h>

main() {
  long result;

  errno = 0;
  puts("Checking NGROUPS_MAX limit");
  if ((result = sysconf(_SC_NGROUPS_MAX)) == -1)
    if (errno == 0)
      puts("NGROUPS_MAX is not supported.");
    else perror("sysconf() error");
  else
    printf("The maximum number of supplemental groups (NGROUPS_MAX) is %ld\n", result);
}

Last edited by fpmurphy; 11-09-2012 at 11:12 AM..

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posix_spawnattr_getsigmask

POSIX_SPAWNATTR_SETSIGMASK(3)				   BSD Library Functions Manual 			     POSIX_SPAWNATTR_SETSIGMASK(3)

NAME

     posix_spawnattr_setsigmask posix_spawnattr_getsigmask -- set or get the spawn-sigmask attribute on a posix_spawnattr_t

SYNOPSIS

     #include <spawn.h>

     int
     posix_spawnattr_setsigmask(posix_spawnattr_t *restrict attr, const sigset_t *restrict sigmask);

     int
     posix_spawnattr_getsigmask(const posix_spawnattr_t *restrict attr, sigset_t *restrict sigmask);

DESCRIPTION

     The posix_spawnattr_setsigmask() function sets the sigmask on the attributes object referenced by attr.

     The posix_spawnattr_getsigmask() function retrieves the sigmask on the attributes object referenced by attr.

     The argument sigmask is the initial signal mask to be set for the new process on creation if the POSIX_SPAWN_SETSIGMASK flag is set in the
     posix_spawnattr_t.  It's default value must be set via a call to posix_spawnattr_setflags(3) or the behaviour is undefined.

RETURN VALUES

     On success, these functions return 0; on failure they return an error number from <errno.h>.  Additionally, if successful,
     posix_spawnattr_getsigmask() will modify the contents of the sigmask parameter with the current attribute value.

ERRORS

     These functions may fail if:

     [EINVAL]		The value specified by attr is invalid.

     [EINVAL]		The value of attr is invalid.

SEE ALSO

     posix_spawn(2), posix_spawnp(2), posix_spawnattr_init(3), posix_spawnattr_destroy(3), posix_spawnattr_setflags(3)

STANDARDS

     Version 3 of the Single UNIX Specification (``SUSv3'') [SPN]

HISTORY

     The posix_spawnattr_setsigmask() and posix_spawnattr_getsigmask() function calls appeared in Version 3 of the Single UNIX Specification
     (``SUSv3'') [SPN].

Mac OS X							  August 22, 2007							  Mac OS X