├── signals
    ├── Makefile
    └── p_sigaction.c
├── README.md
├── processes
    ├── p_print_argv_env.c
    └── p_execve.c
└── LICENSE


/signals/Makefile:
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1 | p_sigaction: p_sigaction.c
2 | 	gcc -o $@ $^
3 | 
4 | clean:
5 | 	rm -f p_sigaction
6 | 


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/README.md:
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1 | # Список курсов
2 | 
3 | ## [Безопасность операционных систем](https://github.com/efanov/mephi/wiki/%D0%91%D0%B5%D0%B7%D0%BE%D0%BF%D0%B0%D1%81%D0%BD%D0%BE%D1%81%D1%82%D1%8C-%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%BD%D1%8B%D1%85-%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC)
4 | 


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/processes/p_print_argv_env.c:
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 1 | /* p_print_argv_env.c */
 2 | 
 3 | #include <stdio.h>
 4 | #include <stdlib.h>
 5 | 
 6 | extern char **environ;
 7 | 
 8 | int main(int argc, char *argv[])
 9 | {
10 |     int j;
11 |     char **ep;
12 | 
13 |     /* Display argument list */
14 | 
15 |     for (j = 0; j < argc; j++)
16 |         printf("argv[%d] = %s\n", j, argv[j]);
17 | 
18 |     /* Display environment list */
19 | 
20 |     for (ep = environ; *ep != NULL; ep++)
21 |         printf("environ: %s\n", *ep);
22 | 
23 |     exit(EXIT_SUCCESS);
24 | }
25 | 


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/processes/p_execve.c:
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 1 | /* p_execve.c */
 2 | 
 3 | #include <stdio.h>
 4 | #include <stdlib.h>
 5 | #include <unistd.h>
 6 | #include <string.h>
 7 | 
 8 | int
 9 | main(int argc, char *argv[])
10 | {
11 |     char *newargv[] = { NULL, "Russia", "Moscow", NULL };
12 |     char *newenviron[] = { "University=MEPhI", NULL };
13 | 
14 |     if (argc != 2) {
15 |         fprintf(stderr, "Usage: %s <file-to-exec>\n", argv[0]);
16 |         exit(EXIT_FAILURE);
17 |     }
18 | 
19 |     newargv[0] = strrchr(argv[1], '/'); /* Get basename from argv[1] */
20 |     if (newargv[0] != NULL)
21 |         newargv[0]++;
22 |     else
23 |         newargv[0] = argv[1];
24 | 
25 |     execve(argv[1], newargv, newenviron);
26 |     perror("execve"); /* execve() returns only on error */
27 |     exit(EXIT_FAILURE);
28 | }
29 | 


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/signals/p_sigaction.c:
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 1 | /* p_sigaction.c */
 2 | 
 3 | #include <sys/types.h>
 4 | #include <unistd.h>
 5 | #include <stdlib.h>
 6 | #include <string.h>
 7 | #include <signal.h>
 8 | #include <stdio.h>
 9 | 
10 | sig_atomic_t sig_received = 0;
11 | 
12 | void handler(int sig)
13 | {
14 |     sig_received = sig;
15 | }
16 | 
17 | int main(int argc, char *argv[])
18 | {
19 |     struct sigaction act;
20 |     sigemptyset(&act.sa_mask);
21 |     act.sa_flags = 0;
22 |     act.sa_handler = &handler;
23 | 
24 |     printf("%s: PID is %ld\n", argv[0], (long) getpid());
25 | 
26 |     if (sigaction(SIGINT, &act, NULL) == -1) {
27 |         perror("sigaction");
28 |         exit(EXIT_FAILURE);
29 |     }
30 | 
31 |     while (1) {
32 |         if (sig_received) {
33 |             printf("Received signal %d (%s)\n", sig_received, strsignal(sig_received));
34 |             sig_received = 0;
35 |         }
36 |     }
37 | 
38 |     exit(EXIT_SUCCESS);
39 | }
40 | 


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/LICENSE:
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 1 | MIT License
 2 | 
 3 | Copyright (c) 2024 Dmitry Efanov
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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