Syscall return
2010年12月11日 — System call的return type為long，主要是要相容64bit，return value通常代表失敗或成功，失敗時，error code當常寫入global variable “errno”。 ,2020年1月27日 — I noticed that syscall return values are passed back to userspace in a single word, using negative values to indicate errors. For syscalls ,syscall() saves CPU registers before making the system call, restores the registers upon return from the system call, and stores any error returned by the system ... ,In that case, syscall returns -1 and sets errno to an error code that the system call returned. Note that system calls do not return -1 when they succeed. If you specify ... ,h defines constants like SYS_read with the actual system call number. (The value you put in EAX before an int 0x80 or syscall instruction). Linux system call return ... ,2014年1月5日 — Because on many 64 bits machines (e.g. x86-64) for the common GCC compiler sizeof(int)==4 but sizeof(void*)==8 && sizeof(long)==8 ; This is ... ,2016年1月23日 — 7. SYSCALL_DEFINE3(open, const char __user *, filename, int , flags, umode_t, mode). . if (force_o_largefile()). flags |= O_LARGEFILE;. return ... ,... 實作例: 新增一個yang.c 內容: #include <linux/syscalls.h> #include <linux/errno.h> asmlinkage long sys_yang(void) printk("My System Call Test-n"); return 0; } ... ,printk("hello system call!-n");. return 0;. } ( 值得注意的是, 檔名需跟system call 名稱一樣, 如上例檔名就必須為hello.c , 否則系統無法找到正確的system call 對應). 5.
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 Syscall return 相關參考資料
Linux Kernel（13）- syscall - Nano雞排
2010年12月11日 — System call的return type為long，主要是要相容64bit，return value通常代表失敗或成功，失敗時，error code當常寫入global variable “errno”。 http://nano-chicken.blogspot.c Syscall return values (and SuccessWithValue) - Google Groups
2020年1月27日 — I noticed that syscall return values are passed back to userspace in a single word, using negative values to indicate errors. For syscalls https://groups.google.com syscall(2) - Linux manual page - man7.org
syscall() saves CPU registers before making the system call, restores the registers upon return from the system call, and stores any error returned by the system ... https://man7.org System Calls (The GNU C Library) - GNU.org
In that case, syscall returns -1 and sets errno to an error code that the system call returned. Note that system calls do not return -1 when they succeed. If you specify ... https://www.gnu.org What are the return values of system calls in Assembly ...
h defines constants like SYS_read with the actual system call number. (The value you put in EAX before an int 0x80 or syscall instruction). Linux system call return ... https://stackoverflow.com Why is Linux syscall return type "long"? - Stack Overflow
2014年1月5日 — Because on many 64 bits machines (e.g. x86-64) for the common GCC compiler sizeof(int)==4 but sizeof(void*)==8 && sizeof(long)==8 ; This is ... https://stackoverflow.com 在Kernel 4.1 Trace Open syscall 筆記– SZ Lin & Embedded ...
2016年1月23日 — 7. SYSCALL_DEFINE3(open, const char __user *, filename, int , flags, umode_t, mode). . if (force_o_largefile()). flags |= O_LARGEFILE;. return ... https://szlin.me 在linux上新增一個system call - OSS Lab. CSIE, FJU
... 實作例: 新增一個yang.c 內容: #include <linux/syscalls.h> #include <linux/errno.h> asmlinkage long sys_yang(void) printk("My System Call Test-n"); return 0; } ... http://oss.csie.fju.edu.tw 如何在Linux系統裡新增一個System Call - OSS Lab. CSIE, FJU
printk("hello system call!-n");. return 0;. } ( 值得注意的是, 檔名需跟system call 名稱一樣, 如上例檔名就必須為hello.c , 否則系統無法找到正確的system call 對應). 5. http://oss.csie.fju.edu.tw |