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Man Pages


Manual Reference Pages  -  EXPLAIN_SETPGRP_OR_DIE (3)

NAME

explain_setpgrp_or_die - set process group and report errors
"set process group and report errors"

CONTENTS

Synopsis
Description
Return Value
Example
See Also
Copyright

SYNOPSIS

#include <libexplain/setpgrp.h>

void explain_setpgrp_or_die(pid_t pid, pid_t pgid);
int explain_setpgrp_on_error(pid_t pid, pid_t pgid);

DESCRIPTION

The B]explain_setpgrp_or_die function is used to call the I]setpgrp(2) system call. On failure an explanation will be printed to I]stderr, obtained from the I]explain_setpgrp(3) function, and then the process terminates by calling CW]exit(EXIT_FAILURE).

The B]explain_setpgrp_on_error function is used to call the I]setpgrp(2) system call. On failure an explanation will be printed to I]stderr, obtained from the I]explain_setpgrp(3) function, but still returns to the caller.
I]pid The pid, exactly as to be passed to the I]setpgrp(2) system call.
I]pgid The pgid, exactly as to be passed to the I]setpgrp(2) system call.
B]Note: the I]setpgrp(2) function has two implementations. The System V version has no arguments, while the BSD version has two arguments. For simplicity of implementation, the argument list seen here includes the I]pid and I]pgid arguments.

The System V CW]getpgid() semantics can be obtained by calling CW]setpgrp(0, 0) on systems with the BSD version, and this is the API for libexplain, even on systems that do not use the BSD API.

RETURN VALUE

The B]explain_setpgrp_or_die function only returns on success, see I]setpgrp(2) for more information. On failure, prints an explanation and exits, it does not return.

The B]explain_setpgrp_on_error function always returns the value return by the wrapped I]setpgrp(2) system call.

EXAMPLE

The B]explain_setpgrp_or_die function is intended to be used in a fashion similar to the following example:
explain_setpgrp_or_die(pid, pgid);

SEE ALSO

I]setpgrp(2)
  set process group
I]explain_setpgrp(3)
  explain I]setpgrp(2) errors
I]exit(2) terminate the calling process

COPYRIGHT

libexplain version 1.3
Copyright © 2011 Peter Miller
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