Enrico Fraccaroli
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/// MentOS, The Mentoring Operating system project
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/// @file t_sigaction.c
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/// @brief
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/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <sys/unistd.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <strerror.h>
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#include <sys/wait.h>
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static int *values = NULL;
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void sigusr1_handler(int sig)
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{
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printf("handler(sig: %d) : Starting handler.\n", sig);
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printf("handler(sig: %d) : value : %d\n", sig, values);
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values = malloc(sizeof(int) * 4);
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for (int i = 0; i < 4; ++i) {
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values[i] = i;
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printf("values[%d] : `%d`\n", i, values[i]);
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}
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printf("handler(sig: %d) : value : %d\n", sig, values);
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printf("handler(sig: %d) : Ending handler.\n", sig);
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}
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int main(int argc, char *argv[])
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{
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sigaction_t action;
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memset(&action, 0, sizeof(action));
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action.sa_handler = sigusr1_handler;
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if (sigaction(SIGUSR1, &action, NULL) == -1) {
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printf("Failed to set signal handler (%s).\n", SIGUSR1, strerror(errno));
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return 1;
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}
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printf("main : Calling handler (%d).\n", SIGUSR1);
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printf("main : value : %d\n", values);
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int ret = kill(getpid(), SIGUSR1);
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printf("main : Returning from handler (%d): %d.\n", SIGUSR1, ret);
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printf("main : value : %d\n", values);
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for (int i = 0; i < 4; ++i)
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printf("values[%d] : `%d`\n", i, values[i]);
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free(values);
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return 0;
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} |