siginterrupt(3)

1SIGINTERRUPT(3)            Linux Programmer's Manual           SIGINTERRUPT(3)
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NAME

6       siginterrupt - allow signals to interrupt system calls
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SYNOPSIS

9       #include <signal.h>
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11       int siginterrupt(int sig, int flag);
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13   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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15       siginterrupt(): _BSD_SOURCE || _XOPEN_SOURCE >= 500
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DESCRIPTION

18       The  siginterrupt() function changes the restart behavior when a system
19       call is interrupted by the signal sig.  If the flag argument  is  false
20       (0),  then  system calls will be restarted if interrupted by the speci‐
21       fied signal sig.  This is the default behavior in Linux.  However, when
22       a new signal handler is specified with the signal(2) function, the sys‐
23       tem call is interrupted by default.
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25       If the flag argument is true (1) and no data has been transferred, then
26       a  system  call  interrupted by the signal sig will return -1 and errno
27       will be set to EINTR.
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29       If the flag argument is true (1) and data transfer  has  started,  then
30       the  system  call will be interrupted and will return the actual amount
31       of data transferred.
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RETURN VALUE

34       The siginterrupt() function returns 0 on success, or -1 if  the  signal
35       number sig is invalid.
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ERRORS

38       EINVAL The specified signal number is invalid.
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CONFORMING TO

41       4.3BSD,  POSIX.1-2001.   POSIX.1-2008 marks siginterrupt() as obsolete,
42       recommending the use of sigaction(2) with the SA_RESTART flag instead.
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COLOPHON

48       This page is part of release 3.25 of the Linux  man-pages  project.   A
49       description  of  the project, and information about reporting bugs, can
50       be found at http://www.kernel.org/doc/man-pages/.
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54                                  2009-03-15                   SIGINTERRUPT(3)