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| author | Mitja Felicijan <mitja.felicijan@gmail.com> | 2024-06-17 17:00:33 +0200 |
|---|---|---|
| committer | Mitja Felicijan <mitja.felicijan@gmail.com> | 2024-06-17 17:00:33 +0200 |
| commit | e34f07dc8bd8db122616b27329404947b49b0d3b (patch) | |
| tree | dafbcba9e4b1767e2437d7928d9913f2e1792993 /content | |
| parent | a304c3714e1ec9238d76d265fec4c93c58152cf9 (diff) | |
| download | mitjafelicijan.com-e34f07dc8bd8db122616b27329404947b49b0d3b.tar.gz | |
Note: Sending signals to C programs
Diffstat (limited to 'content')
| -rw-r--r-- | content/notes/2024-06-17-sending-signals-to-c-programs.md | 85 |
1 files changed, 43 insertions, 42 deletions
diff --git a/content/notes/2024-06-17-sending-signals-to-c-programs.md b/content/notes/2024-06-17-sending-signals-to-c-programs.md index 94f0b94..bd4a895 100644 --- a/content/notes/2024-06-17-sending-signals-to-c-programs.md +++ b/content/notes/2024-06-17-sending-signals-to-c-programs.md | |||
| @@ -9,8 +9,8 @@ draft: false | |||
| 9 | For simple and easy IPC to the C program we can use signals. | 9 | For simple and easy IPC to the C program we can use signals. |
| 10 | https://www.man7.org/linux/man-pages/man7/signal.7.html | 10 | https://www.man7.org/linux/man-pages/man7/signal.7.html |
| 11 | 11 | ||
| 12 | Only two user defined signals are available but you can hijack other ones even | 12 | Only two user defined signals are available (`SIGUSR1` and `SIGUSR2`) but you |
| 13 | though this is really not advisable. | 13 | can hijack other ones even though this is really not advisable. |
| 14 | 14 | ||
| 15 | ```c | 15 | ```c |
| 16 | // signal.c | 16 | // signal.c |
| @@ -39,43 +39,44 @@ Compile with `gcc -o signal signal.c` and run the program with `./signal` and | |||
| 39 | then from another terminal send the signal to the program with `kill -10 | 39 | then from another terminal send the signal to the program with `kill -10 |
| 40 | $(pidof signal)` which should print out `Signal received: 10`. | 40 | $(pidof signal)` which should print out `Signal received: 10`. |
| 41 | 41 | ||
| 42 | | Signal | x86/ARM | Alpha/ | MIPS | PARISC | Notes | | 42 | | Signal | x86/ARM | Alpha/ | MIPS | PARISC | Notes | |
| 43 | |-----------|---------|--------|------|--------|---------------| | 43 | |-------------|---------|--------|--------|--------|---------------| |
| 44 | | SIGHUP | 1 | 1 | 1 | 1 | | | 44 | | SIGHUP | 1 | 1 | 1 | 1 | | |
| 45 | | SIGINT | 2 | 2 | 2 | 2 | | | 45 | | SIGINT | 2 | 2 | 2 | 2 | | |
| 46 | | SIGQUIT | 3 | 3 | 3 | 3 | | | 46 | | SIGQUIT | 3 | 3 | 3 | 3 | | |
| 47 | | SIGILL | 4 | 4 | 4 | 4 | | | 47 | | SIGILL | 4 | 4 | 4 | 4 | | |
| 48 | | SIGTRAP | 5 | 5 | 5 | 5 | | | 48 | | SIGTRAP | 5 | 5 | 5 | 5 | | |
| 49 | | SIGABRT | 6 | 6 | 6 | 6 | | | 49 | | SIGABRT | 6 | 6 | 6 | 6 | | |
| 50 | | SIGIOT | 6 | 6 | 6 | 6 | | | 50 | | SIGIOT | 6 | 6 | 6 | 6 | | |
| 51 | | SIGBUS | 7 | 10 | 10 | 10 | | | 51 | | SIGBUS | 7 | 10 | 10 | 10 | | |
| 52 | | SIGEMT | - | 7 | 7 | - | | | 52 | | SIGEMT | - | 7 | 7 | - | | |
| 53 | | SIGFPE | 8 | 8 | 8 | 8 | | | 53 | | SIGFPE | 8 | 8 | 8 | 8 | | |
| 54 | | SIGKILL | 9 | 9 | 9 | 9 | | | 54 | | SIGKILL | 9 | 9 | 9 | 9 | | |
| 55 | | SIGUSR1 | 10 | 30 | 16 | 16 | | | 55 | | **SIGUSR1** | **10** | **30** | **16** | **16** | | |
| 56 | | SIGSEGV | 11 | 11 | 11 | 11 | | | 56 | | SIGSEGV | 11 | 11 | 11 | 11 | | |
| 57 | | SIGUSR2 | 12 | 31 | 17 | 17 | | | 57 | | **SIGUSR2** | **12** | **31** | **17** | **17** | | |
| 58 | | SIGPIPE | 13 | 13 | 13 | 13 | | | 58 | | SIGPIPE | 13 | 13 | 13 | 13 | | |
| 59 | | SIGALRM | 14 | 14 | 14 | 14 | | | 59 | | SIGALRM | 14 | 14 | 14 | 14 | | |
| 60 | | SIGTERM | 15 | 15 | 15 | 15 | | | 60 | | SIGTERM | 15 | 15 | 15 | 15 | | |
| 61 | | SIGSTKFLT | 16 | - | - | 7 | | | 61 | | SIGSTKFLT | 16 | - | - | 7 | | |
| 62 | | SIGCHLD | 17 | 20 | 18 | 18 | | | 62 | | SIGCHLD | 17 | 20 | 18 | 18 | | |
| 63 | | SIGCLD | - | - | 18 | - | | | 63 | | SIGCLD | - | - | 18 | - | | |
| 64 | | SIGCONT | 18 | 19 | 25 | 26 | | | 64 | | SIGCONT | 18 | 19 | 25 | 26 | | |
| 65 | | SIGSTOP | 19 | 17 | 23 | 24 | | | 65 | | SIGSTOP | 19 | 17 | 23 | 24 | | |
| 66 | | SIGTSTP | 20 | 18 | 24 | 25 | | | 66 | | SIGTSTP | 20 | 18 | 24 | 25 | | |
| 67 | | SIGTTIN | 21 | 21 | 26 | 27 | | | 67 | | SIGTTIN | 21 | 21 | 26 | 27 | | |
| 68 | | SIGTTOU | 22 | 22 | 27 | 28 | | | 68 | | SIGTTOU | 22 | 22 | 27 | 28 | | |
| 69 | | SIGURG | 23 | 16 | 21 | 29 | | | 69 | | SIGURG | 23 | 16 | 21 | 29 | | |
| 70 | | SIGXCPU | 24 | 24 | 30 | 12 | | | 70 | | SIGXCPU | 24 | 24 | 30 | 12 | | |
| 71 | | SIGXFSZ | 25 | 25 | 31 | 30 | | | 71 | | SIGXFSZ | 25 | 25 | 31 | 30 | | |
| 72 | | SIGVTALRM | 26 | 26 | 28 | 20 | | | 72 | | SIGVTALRM | 26 | 26 | 28 | 20 | | |
| 73 | | SIGPROF | 27 | 27 | 29 | 21 | | | 73 | | SIGPROF | 27 | 27 | 29 | 21 | | |
| 74 | | SIGWINCH | 28 | 28 | 20 | 23 | | | 74 | | SIGWINCH | 28 | 28 | 20 | 23 | | |
| 75 | | SIGIO | 29 | 23 | 22 | 22 | | | 75 | | SIGIO | 29 | 23 | 22 | 22 | | |
| 76 | | SIGPOLL | | | | | Same as SIGIO | | 76 | | SIGPOLL | | | | | Same as SIGIO | |
| 77 | | SIGPWR | 30 | 29/- | 19 | 19 | | | 77 | | SIGPWR | 30 | 29/- | 19 | 19 | | |
| 78 | | SIGINFO | - | 29/- | - | - | | | 78 | | SIGINFO | - | 29/- | - | - | | |
| 79 | | SIGLOST | - | -/29 | - | - | | | 79 | | SIGLOST | - | -/29 | - | - | | |
| 80 | | SIGSYS | 31 | 12 | 12 | 31 | | | 80 | | SIGSYS | 31 | 12 | 12 | 31 | | |
| 81 | | SIGUNUSED | 31 | - | - | 31 | | | 81 | | SIGUNUSED | 31 | - | - | 31 | | |
| 82 | |||