/Users/deen/code/yugabyte-db/build/debugcov-clang-dynamic-arm64-ninja/postgres_build/src/interfaces/libpq/pqsignal.c
Line | Count | Source (jump to first uncovered line) |
1 | | /*------------------------------------------------------------------------- |
2 | | * |
3 | | * pqsignal.c |
4 | | * reliable BSD-style signal(2) routine stolen from RWW who stole it |
5 | | * from Stevens... |
6 | | * |
7 | | * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group |
8 | | * Portions Copyright (c) 1994, Regents of the University of California |
9 | | * |
10 | | * |
11 | | * IDENTIFICATION |
12 | | * src/port/pqsignal.c |
13 | | * |
14 | | * We now assume that all Unix-oid systems have POSIX sigaction(2) |
15 | | * with support for restartable signals (SA_RESTART). We used to also |
16 | | * support BSD-style signal(2), but there really shouldn't be anything |
17 | | * out there anymore that doesn't have the POSIX API. |
18 | | * |
19 | | * Windows, of course, is resolutely in a class by itself. In the backend, |
20 | | * we don't use this file at all; src/backend/port/win32/signal.c provides |
21 | | * pqsignal() for the backend environment. Frontend programs can use |
22 | | * this version of pqsignal() if they wish, but beware that this does |
23 | | * not provide restartable signals on Windows. |
24 | | * |
25 | | * ------------------------------------------------------------------------ |
26 | | */ |
27 | | |
28 | | #include "c.h" |
29 | | |
30 | | #include <signal.h> |
31 | | |
32 | | #if !defined(WIN32) || defined(FRONTEND) |
33 | | |
34 | | /* |
35 | | * Set up a signal handler, with SA_RESTART, for signal "signo" |
36 | | * |
37 | | * Returns the previous handler. |
38 | | */ |
39 | | pqsigfunc |
40 | | pqsignal(int signo, pqsigfunc func) |
41 | 79.3k | { |
42 | 79.3k | #ifndef WIN32 |
43 | 79.3k | struct sigaction act, |
44 | 79.3k | oact; |
45 | | |
46 | 79.3k | act.sa_handler = func; |
47 | 79.3k | sigemptyset(&act.sa_mask); |
48 | 79.3k | act.sa_flags = SA_RESTART; |
49 | 79.3k | #ifdef SA_NOCLDSTOP |
50 | 79.3k | if (signo == SIGCHLD) |
51 | 5.25k | act.sa_flags |= SA_NOCLDSTOP; |
52 | 79.3k | #endif |
53 | 79.3k | if (sigaction(signo, &act, &oact) < 0) |
54 | 0 | return SIG_ERR; |
55 | 79.3k | return oact.sa_handler; |
56 | | #else /* WIN32 */ |
57 | | return signal(signo, func); |
58 | | #endif |
59 | 79.3k | } |
60 | | |
61 | | /* |
62 | | * Set up a signal handler, without SA_RESTART, for signal "signo" |
63 | | * |
64 | | * Returns the previous handler. |
65 | | * |
66 | | * On Windows, this would be identical to pqsignal(), so don't bother. |
67 | | */ |
68 | | #ifndef WIN32 |
69 | | |
70 | | pqsigfunc |
71 | | pqsignal_no_restart(int signo, pqsigfunc func) |
72 | 6.32k | { |
73 | 6.32k | struct sigaction act, |
74 | 6.32k | oact; |
75 | | |
76 | 6.32k | act.sa_handler = func; |
77 | 6.32k | sigemptyset(&act.sa_mask); |
78 | 6.32k | act.sa_flags = 0; |
79 | 6.32k | #ifdef SA_NOCLDSTOP |
80 | 6.32k | if (signo == SIGCHLD) |
81 | 904 | act.sa_flags |= SA_NOCLDSTOP; |
82 | 6.32k | #endif |
83 | 6.32k | if (sigaction(signo, &act, &oact) < 0) |
84 | 0 | return SIG_ERR; |
85 | 6.32k | return oact.sa_handler; |
86 | 6.32k | } |
87 | | |
88 | | #endif /* !WIN32 */ |
89 | | |
90 | | #endif /* !defined(WIN32) || defined(FRONTEND) */ |