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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 <[email protected]> |
.\" |
.\" %%%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.\" manual page may be incorrect or out-of-date.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 |
.\" <[email protected]>. |
.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 |
Subsets and Splits