├── OSSP_Individual_Tiruneh_Getachw_BDU1602613.pdf
├── README.md
├── System Call Implementation.pdf
└── System_Call.c


/OSSP_Individual_Tiruneh_Getachw_BDU1602613.pdf:
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https://raw.githubusercontent.com/tirunehg38/OSSP_Android_OS/e36ce12c14795fca21654cc09caa9ca2f6b88fd6/OSSP_Individual_Tiruneh_Getachw_BDU1602613.pdf


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/README.md:
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1 | "My work demonstrates how to run Android OS on a PC using VMware, providing a practical alternative to physical devices for app testing and development. Through this project, I implemented a Linux system call (clock_settime) to modify system time, showcasing hands-on interaction with the operating system kernel. This exploration highlights the power of virtualization for safe experimentation while bridging theoretical OS concepts with real-world implementation."
2 | 


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/System Call Implementation.pdf:
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https://raw.githubusercontent.com/tirunehg38/OSSP_Android_OS/e36ce12c14795fca21654cc09caa9ca2f6b88fd6/System Call Implementation.pdf


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/System_Call.c:
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 1 | #include <time.h>
 2 | #include <stdio.h>
 3 | #include <sys/syscall.h>
 4 | #include <unistd.h>
 5 | 
 6 | int main() {
 7 |     // Set desired time (April 24, 2024 12:00:00 UTC)
 8 |     struct timespec ts = {
 9 |         .tv_sec = 1713960000,
10 |         .tv_nsec = 0
11 |     };
12 | 
13 |     // Attempt to set system clock
14 |     int result = syscall(SYS_clock_settime, CLOCK_REALTIME, &ts);
15 | 
16 |     if (result == -1) {
17 |         perror("Error setting time");
18 |         return 1;
19 |     }
20 | 
21 |     printf("Time successfully set to %ld\n", ts.tv_sec);
22 |     return 0;
23 | }
24 | 


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