sgetmask(2) — Linux manual page

sgetmask(2)                System Calls Manual               sgetmask(2)

NAME         top

       sgetmask, ssetmask - manipulation of signal mask (obsolete)

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <sys/syscall.h>      /* Definition of SYS_* constants */
       #include <unistd.h>

       [[deprecated]] long syscall(SYS_sgetmask, void);
       [[deprecated]] long syscall(SYS_ssetmask, long newmask);

DESCRIPTION         top

       These system calls are obsolete.  Do not use them; use
       sigprocmask(2) instead.

       sgetmask() returns the signal mask of the calling process.

       ssetmask() sets the signal mask of the calling process to the
       value given in newmask.  The previous signal mask is returned.

       The signal masks dealt with by these two system calls are plain
       bit masks (unlike the sigset_t used by sigprocmask(2)); use
       sigmask(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 the
       CONFIG_SGETMASK_SYSCALL option.

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 block SIGSTOP or SIGKILL.

SEE ALSO         top

       sigprocmask(2), signal(7)

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02                    sgetmask(2)

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

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