sgetmask(2)

1sgetmask(2)                   System Calls Manual                  sgetmask(2)
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NAME

6       sgetmask, ssetmask - manipulation of signal mask (obsolete)
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <sys/syscall.h>      /* Definition of SYS_* constants */
13       #include <unistd.h>
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15       [[deprecated]] long syscall(SYS_sgetmask, void);
16       [[deprecated]] long syscall(SYS_ssetmask, long newmask);
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DESCRIPTION

19       These  system  calls are obsolete.  Do not use them; use sigprocmask(2)
20       instead.
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22       sgetmask() returns the signal mask of the calling process.
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24       ssetmask() sets the signal mask of the calling  process  to  the  value
25       given in newmask.  The previous signal mask is returned.
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27       The  signal  masks  dealt  with by these two system calls are plain bit
28       masks (unlike the sigset_t used by sigprocmask(2)); use  sigmask(3)  to
29       create and inspect these masks.
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RETURN VALUE

32       sgetmask() always successfully returns the signal mask.  ssetmask() al‐
33       ways succeeds, and returns the previous signal mask.
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ERRORS

36       These system calls always succeed.
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STANDARDS

39       Linux.
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HISTORY

42       Since Linux 3.16, support for these system calls is optional, depending
43       on  whether  the  kernel was built with the CONFIG_SGETMASK_SYSCALL op‐
44       tion.
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NOTES

47       These system calls are unaware of signal numbers greater than 31 (i.e.,
48       real-time signals).
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50       These system calls do not exist on x86-64.
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52       It is not possible to block SIGSTOP or SIGKILL.
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