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| .TH SGETMASK 2 2021-03-22 "Linux" "Linux Programmer's Manual" |
| .SH NAME |
| sgetmask, ssetmask \- manipulation of signal mask (obsolete) |
| .SH SYNOPSIS |
| .nf |
| .B "long sgetmask(void);" |
| .BI "long ssetmask(long " newmask ); |
| .fi |
| .PP |
| .IR Note : |
| There are no glibc wrappers for these system calls; see NOTES. |
| .SH DESCRIPTION |
| These system calls are obsolete. |
| .IR "Do not use them" ; |
| use |
| .BR sigprocmask (2) |
| instead. |
| .PP |
| .BR sgetmask () |
| returns the signal mask of the calling process. |
| .PP |
| .BR ssetmask () |
| sets the signal mask of the calling process to the value given in |
| .IR newmask . |
| The previous signal mask is returned. |
| .PP |
| The signal masks dealt with by these two system calls |
| are plain bit masks (unlike the |
| .I sigset_t |
| used by |
| .BR sigprocmask (2)); |
| use |
| .BR sigmask (3) |
| to create and inspect these masks. |
| .SH RETURN VALUE |
| .BR sgetmask () |
| always successfully returns the signal mask. |
| .BR ssetmask () |
| always succeeds, and returns the previous signal mask. |
| .SH ERRORS |
| These system calls always succeed. |
| .SH VERSIONS |
| Since Linux 3.16, |
| .\" f6187769dae48234f3877df3c4d99294cc2254fa |
| support for these system calls is optional, |
| depending on whether the kernel was built with the |
| .B CONFIG_SGETMASK_SYSCALL |
| option. |
| .SH CONFORMING TO |
| These system calls are Linux-specific. |
| .SH NOTES |
| Glibc does not provide wrappers for these obsolete system calls; |
| in the unlikely event that you want to call them, use |
| .BR syscall (2). |
| .PP |
| These system calls are unaware of signal numbers greater than 31 |
| (i.e., real-time signals). |
| .PP |
| These system calls do not exist on x86-64. |
| .PP |
| It is not possible to block |
| .B SIGSTOP |
| or |
| .BR SIGKILL . |
| .SH SEE ALSO |
| .BR sigprocmask (2), |
| .BR signal (7) |