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sgetmask(2) — Linux manual page

sgetmask(2)                System Calls Manualsgetmask(2)

NAME        top

       sgetmask, ssetmask - manipulation of signal mask (obsolete)

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <sys/syscall.h>/* Definition ofSYS_*constants */#include <unistd.h>[[deprecated]] long syscall(SYS_sgetmask, void);[[deprecated]] long syscall(SYS_ssetmask, longnewmask);

DESCRIPTION        top

       These system calls are obsolete.Do not use them; usesigprocmask(2) instead.sgetmask() returns the signal mask of the calling process.ssetmask() sets the signal mask of the calling process to the       value given innewmask.  The previous signal mask is returned.       The signal masks dealt with by these two system calls are plain       bit masks (unlike thesigset_t used bysigprocmask(2)); usesigmask(3) to create and inspect these masks.

RETURN VALUE        top

sgetmask() always successfully returns the signal mask.ssetmask() always succeeds, and returns the previous signal mask.

ERRORS        top

       These system calls always succeed.

STANDARDS        top

       Linux.

HISTORY        top

       Since Linux 3.16, support for these system calls is optional,       depending on whether the kernel was built with theCONFIG_SGETMASK_SYSCALLoption.

NOTES        top

       These system calls are unaware of signal numbers greater than 31       (i.e., real-time signals).       These system calls do not exist on x86-64.       It is not possible to blockSIGSTOPorSIGKILL.

SEE ALSO        top

sigprocmask(2),signal(7)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17sgetmask(2)

Pages that refer to this page:syscalls(2), signal(7)

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