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.br setregid32 (),
supporting 32-bit ids.
the glibc
.br setreuid ()
and
.br setregid ()
wrapper functions transparently deal with the variations across kernel versions.
.\"
.ss c library/kernel differences
at the kernel level, user ids and group ids are a per-thread attribute.
however, posix requires that all threads in a process
share the same credentials.
the nptl threading implementation handles the posix requirements by
providing wrapper functions for
the various system calls that change process uids and gids.
these wrapper functions (including those for
.br setreuid ()
and
.br setregid ())
employ a signal-based technique to ensure
that when one thread changes credentials,
all of the other threads in the process also change their credentials.
for details, see
.br nptl (7).
.sh see also
.br getgid (2),
.br getuid (2),
.br seteuid (2),
.br setgid (2),
.br setresuid (2),
.br setuid (2),
.br capabilities (7),
.br credentials (7),
.br user_namespaces (7)
.sh colophon
this page is part of release 5.13 of the linux
.i man-pages
project.
a description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.
.so man3/mkstemp.3
.\" copyright (c) 2002 andries brouwer <aeb@cwi.nl>
.\"
.\" %%%license_start(verbatim)
.\" permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" since the linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. the author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. the author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\" %%%license_end
.\"
.\" this replaces an earlier man page written by walter harms
.\" <walter.harms@informatik.uni-oldenburg.de>.
.th gsignal 3 2021-03-22 "" "linux programmer's manual"
.sh name
gsignal, ssignal \- software signal facility
.sh synopsis
.nf
.b #include <signal.h>
.pp
.b typedef void (*sighandler_t)(int);
.pp
.bi "int gsignal(int " signum );
.pp
.bi "sighandler_t ssignal(int " signum ", sighandler_t " action );
.fi
.pp
.rs -4
feature test macro requirements for glibc (see
.br feature_test_macros (7)):
.re
.pp
.br gsignal (),
.br ssignal ():
.nf
since glibc 2.19:
_default_source
glibc 2.19 and earlier:
_svid_source
.fi
.sh description